Showing papers on "Prepared Material published in 2012"

Materials Science and Engineering A

Abstract: a b s t r a c t The rapidly solidified AlCr4.7Fe1.1Si0.3 (at.%) alloy produced at large scale by direct extrusion of gas atomised powders was investigated. Hot-extrusion yielded sound compacts and did not create any major structural changes compared to the as-atomised state. Microstructural characterisation of the as-extruded material revealed submicron scale -Al grains with an embedded Al7Cr crystalline phase and traces of a nano-scale quasicrystalline Al84.6Cr15.4 phase. The long-term thermal stability up to 300 ◦C of compacts was proven. The thermal stability of compacts was accompanied by high mechanical prop- erties, especially high strength and Young's modulus, and creep performance up to 300 ◦C. The same material was prepared by laboratory scale extrusion of cryo-chopped melt-spun ribbons as a reference material. No major differences in the structure or properties of the industrially prepared material were observed compared to the reference material.

Rapid Microwave Preparation of Highly Efficient Ce3+-Substituted Garnet Phosphors for Solid State White Lighting

Abstract: Ce3+-substituted aluminum garnet compounds of yttrium (Y3Al5O12) and lutetium (Lu3Al5O12)—both important compounds in the generation of (In,Ga)N-based solid state white lighting—have been prepared using a simple microwave heating technique involving the use of a microwave susceptor to provide the initial heat source. Carbon used as the susceptor additionally creates a reducing atmosphere around the sample that helps stabilize the desired luminescent compound. High quality, phase-pure materials are prepared within a fraction of the time and using a fraction of the energy required in a conventional ceramic preparation; the microwave technique allows for a reduction of about 95% in preparation time, making it possible to obtain phase pure, Ce3+-substituted garnet compounds in under 20 min of reaction time. It is estimated that the overall reduction in energy compared with ceramic routes as practised in the lab is close to 99%. Conventionally prepared material is compared with material prepared using microwav...

Amino modified SiO2 aerogel material and application thereof

Abstract: The invention relates to an amino modified SiO2 aerogel material which is prepared by the steps of: firstly, hydrolyzing tetraethyl orthosilicate (TEOS) in an ethanol system to obtain a gel precursor with a sol-gel method; adjusting the pH value of a hydrolysis solution to obtain SiO2 wet gel; adding a mixed solution of an amino modifier and ethanol for modification after the gel reaches a certain strength; and finally cleaning the modified wet gel with the ethanol, and carrying out supercritical drying with ethanol under a certain condition to obtain the amino modified SiO2 aerogel materialThe serogel material can be used for CO2 adsorption The invention is a novel modification mode of the aerogel material and also new application of the modified SiO2 aerogel material in the field of CO2 adsorption The method has simple preparation process, and meanwhile, the prepared material has a favorable CO2 adsorption cycle performance

Microstructure and properties of extruded rapidly solidified AlCr4.7Fe1.1Si0.3 (at.%) alloys

Abstract: The rapidly solidified AlCr4.7Fe1.1Si0.3 (at.%) alloy produced at large scale by direct extrusion of gas atomised powders was investigated. Hot-extrusion yielded sound compacts and did not create any major structural changes compared to the as-atomised state. Microstructural characterisation of the as-extruded material revealed submicron scale α-Al grains with an embedded Al7Cr crystalline phase and traces of a nano-scale quasicrystalline Al84.6Cr15.4 phase. The long-term thermal stability up to 300 °C of compacts was proven. The thermal stability of compacts was accompanied by high mechanical properties, especially high strength and Young's modulus, and creep performance up to 300 °C. The same material was prepared by laboratory scale extrusion of cryo-chopped melt-spun ribbons as a reference material. No major differences in the structure or properties of the industrially prepared material were observed compared to the reference material.

Method for quickly preparing carbon-silicon dioxide composite aerogel

Abstract: The invention relates to a method for quickly preparing carbon-silicon dioxide composite aerogel. In the method, resorcinol, formaldehyde and tetraethoxysilane are taken as reactants, and a low-density and high-porosity carbon-silicon dioxide composite aerogel material is prepared by combining a sol-gel method under the catalysis of composite acid in an adjustable proportion with a special dryingand carbonizing process. Compared with the conventional method for preparing similar materials under the catalysis of alkali, the preparation method has the advantages that: by a one-pot sol-gel synthesis process, the solation and gelation processes of two precursors, namely carbon and silicon dioxide are performed simultaneously, and the components of the material are more uniformly compounded; and gelation time and ageing time are short, preparation efficiency is high, the preparation process is simple, the method can be operated at room temperature, and the like. The prepared material can be used for the fields of adsorption filtration, catalysis, energy, aerospace, laser inertial confinement fusion target materials and the like.

Method for preparing three-dimensional porous graphene material by solution

Abstract: The invention discloses a method for preparing a three-dimensional porous graphene material by solution The method comprises the following steps of: immersing a three-dimensional porous template into a graphene oxide solution, and then depositing the graphene oxide on the template to realize three-dimensional assembling of the graphene oxide on the template, and then preparing the three-dimensional porous graphene material containing the template by reduction; removing the template from the three-dimensional porous graphene material containing the template, and then washing to obtain the three-dimensional porous graphene material The aperture of the three-dimensional porous graphene material can be regulated and controlled by using the templates with different apertures the material prepared by the invention has the advantages of low density, high specific surface area, high heat conductivity, high-temperature resistance, and corrosion resistance; the preparation method is economical and simple and suitable for large-scale production And the prepared material is applicable to aspects such as catalytic carriers, preparation of flexible conductors, and stretchable electronics

Li EXCESS Li4+xTi5-xO12-δ/C COMPOSITE USING SPRAY-DRYING METHOD AND ITS ELECTRODE PROPERTIES

Abstract: We have prepared a lithium excess carbon composite material, Li4+xTi5-xO12-δ/C (LTO/C), using various amounts of sucrose as a carbon source by the spray-drying method. The prepared materials were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and elemental analysis. The prepared material had the Li4Ti5O12 phase including 3.9–18.4 wt.% carbon. Transmission electron microscopy images and the selected area diffraction (SAD) pattern showed that the prepared materials consisted of a carbon nanonetwork in the LTO/C composite. The charge–discharge cycling tests were carried out using the R2032 coin-type cell under the following conditions; 1.2–3.0 V, 0.1 C–10 C (1 C = 175 mA g-1), 25°C. Based on the electrochemical results, the electrode performance of the prepared material was improved with increasing amounts of residual carbon, in particular, LTO/C including 6.2 wt.% residual carbon exhibited the best electrode performance of 156 mAh g-1 at 1 C during 50 cyclings when compared to the other materials.

Copper containing TUD-1: synthesis, characterization and catalytic behavior in liquid-phase oxidation of ethylbenzene

Abstract: Three dimensional amorphous mesoporous material, TUD-1 with different Cu-loading were prepared by using triethanolamine (TEA) as cheap, small, bi-functional template which acts as a mesoporous directing agent as well as an anchoring agent for copper active sites on the mesoporous wall. The materials thus prepared have been characterized by X-ray diffraction, N2 sorption, FT-IR, TEM, DR-UV–Vis and ICP-OES. The catalytic activities of the prepared material (CuTUD-1) were tested in liquid phase oxidation of ethylbenzene with tert-butyl hydroperoxide (TBHP) as an oxidant. Influence of various reaction parameters such as time, temperature, Si to Cu ratio, oxidant and solvent were studied. Isolated framework substituted Cu sites are active for ethylbenzene conversion (35.2%) with 67% selectivity towards acetophenone.

Flame-retardant anti-bacteria polypropylene composite material and preparation method thereof

Abstract: The invention discloses a flame-retardant anti-bacteria polypropylene composite material and a preparation method thereof. The flame-retardant anti-bacteria polypropylene composite material is prepared by the following raw materials according to the weight percentage: 78.6% to 86.7% of polypropylene, 6.0% to 10.0% of linear low-density polyethylene, 0.1% to 0.2% of white oil, 6.0% to 9.0% of fire retardant, 0.2% to 0.5% of anti-bacterial agent, 0.5% to 0.8% of dispersant, 0.4% to 0.7% of lubricant, and 0.1% to 0.2% of oxidation inhibitor. The raw materials are weighed according to the above weight percentages so as to be mixed uniformly, melted and extruded by a double-screw extruder and pelleted. The preparation method is simple in technology, low in cost and high in cost performance, and has fire retardant property and anti-bacterial performance, and the prepared material is excellent in combination property.

One-step preparation method and application of beta-cyclodextrin/polyurethane porous foaming material

Abstract: The present invention belongs to the field of polymer material synthesis, relates to a preparation method for a beta-cyclodextrin/polyurethane porous foaming material, and particularly to a one-step preparation method and an application of the beta-cyclodextrin/polyurethane porous foaming material. The one-step preparation method of the present invention comprises: uniformly mixing polyol, beta-cyclodextrin, a foaming agent, a foam stabilizer, water and a catalyst at a room temperature; rapidly adding diisocyanate; stirring for 15 s-5 min; stopping the stirring when bubbles appear in the mixture and the color is whitish; freely foaming; and finally placing the mixture in an environment with a temperature of 108-120 DEG C to carry out aging for 3-5 hours, and cooling to obtain the material. With application of the prepared material in absorption of chrome black T, eriochrome blue black R, Sudan red, Mn (VII), Cu (II), Cr (III) and other wastewater solutions, results show that good adsorption and removal effects are provided. In addition, with application of the material in treatments of dyes or heavy metal ions in sewage, characteristics of simple operation, low cost and high adsorption rate are provided, and a certain practical value is provided.

Method for preparing in situ titanium-based composite material and part

Abstract: The invention relates to a method for preparing an in situ titanium-based composite material and a part, and belongs to the fields of metal-based composite materials and preparation thereof. The method comprises the following steps of: preparing mixed powder of titanium alloy powder and powder of one or two of TiB2 and TiC, and stacking the mixed powder subjected to laser smelting deposition and synchronous delivery layer by layer to directly prepare the in situ titanium-based composite material and the near net shape part thereof. By the method, the composition and the proportion of the enhanced phase of the titanium-based composite material can be flexibly controlled, the prepared material does not contain un-smelted additional powder granules, and the material has higher high-temperature mechanical property.

Industrial preparation method for lithium iron phosphate

Abstract: The invention belongs to an energy material, and particularly relates to a method for preparing a lithium iron phosphate anode material suitable to be used by a power type lithium ion battery and the like by using PVP (polyvinylpyrrolidone) as a dispersant and a carbon source at the same time in an aqueous solution. The method comprises the following steps of: weighing a lithium source compound, an iron source compound and a phosphorus source compound in a weight ratio, adding the compounds into water, adding a proper amount of PVP into the mixture, grinding the mixture for certain time, drying the mixture, transferring the obtained precursor into an atmosphere protection furnace, treating the precursor for certain time at a high temperature under inert atmosphere, and cooling the productto obtain the lithium iron phosphate. By observing, one-time particles are uniform and fine, and the first discharge capacity is 157.6mAh/g. The method has the advantages of low energy consumption, high grinding efficiency and environment-friendly and pollution-free production process, and is an excellent method for synthesizing a green new energy source material. The prepared material has the advantages of uniform particle size distribution, good circulating stability and prominent magnification performance, and is a battery anode material suitable for high-capacity energy storage equipment such as substations and the like and large-sized mobile equipment such as electric automobiles and the like.

Biodegradable material containing fiber base and polylactic acid and preparation method thereof

Abstract: The invention relates to a biodegradable material containing a fiber base and polylactic acid and a preparation method thereof. The biodegradable material is prepared by mixing the following raw materials in percentage by weight: 30-50% of fiber powder, 30-60% of polylactic acid, 5-20% of crosslinking modifier and 5-20% of addition agent. The preparation method comprises the following steps: carrying out drying and hydrophobic treatment on the fiber powder for 0.5-1 hour in advance; then adding the polylactic acid and the crosslinking modifier after uniformly blending the fiber powder in a high-speed mixer at a rotation speed of 800-1500 r/min; then adding the addition agent, controlling the temperature to be within 100 DEG C, and mixing the materials in the high-speed mixer jointly; then granulating the mixture with an extruder, and controlling the granulation temperature to range between 110 DEG C and 200 DEG C; and carrying out blow molding, suction molding or injection molding on the obtained granules according to the conventional plastic processing method to obtain the product. The prepared material and product have sufficient mechanical performance, high temperature resistance, water resistance, oil resistance and other chemical stability, and the problem of environmental pollution caused by nondegradable plastics is solved.

Method for preparing carbon fiber reinforced carbon and hexagonal boron nitride double-matrix friction material

Abstract: The invention relates to a method for preparing a carbon fiber reinforced carbon and hexagonal boron nitride double-matrix friction material. The method comprises the following steps of: 1, spreading powder in layers: uniformly adhering boron nitride (BN) powder on two sides of each monolayer carbon fiber felt; 2, superimposing, needling and compounding: superimposing the felts obtained in the step 1 on one another, and needling the superimposed felts to obtain a BN powder-containing carbon fiber prefabricated body material; 3, chemical vapor infiltration: depositing a pyrolytic carbon matrixfrom the BN powder-containing carbon fiber prefabricated body material by adopting a chemical vapor infiltration method to obtain a carbon fiber reinforced carbon and boron nitride double-matrix (C/C-BN) friction material; and 4, graphitizing: graphitizing the C/C-BN composite material which is obtained by the step 3 to obtain the desired C/C-BN friction material. The method for preparing the carbon fiber reinforced carbon and hexagonal boron nitride double-matrix friction material has the advantages of simple and controllable production process, low preparation cost, controllable microstructure and performance of the prepared material, uniform structure, high strength, high temperature resistance, corrosion resistance, high frictional and abrasive properties and capacity of realizing industrial production.

Modified spinel lithium manganate material and preparation method thereof

Abstract: The present invention relates to a modified nanometer spinel lithium manganate material and a preparation method thereof, specifically to a method for carrying out composite doping modification on spinel by adopting a plurality of metals selected from Mg, Zn, Al and other metals according to a certain combination of the metals, and belongs to the technical field of lithium batteries. According to the present invention, a lithium source, a manganese source, and an acetate or a nitrate of a metal M are grinded and uniformly mixed in a mortar according to a certain molar ratio; deionized water and citric acid are added; concentrated ammonia water is adopted to adjust the pH value; a heating evaporation treatment is performed to obtain a wet gel; the wet gel is dried to obtain a dry gel; and the dry gel is subjected to ignition grinding twice to obtain the product, wherein the product is the modified spinel lithium manganate material. The preparation method of the present invention belongs to the nanometer range, such that the prepared material has high discharge capacity and good rate performance. With the composite doping, cycle performance and high temperature performance of the material can be improved, such that the important practical application significance is provided.

High-transparency, heat-resistant and impact-resistant modified polypropylene composite material and preparation method thereof

Abstract: The invention discloses a high-transparency, heat-resistant and impact-resistant modified polypropylene composite material and a preparation method thereof. The composite material is prepared from the following raw materials in percentage by weight: 70 to 94.8 percent of polypropylene, 3 to 20 percent of poly (4-methyl-l-pentene) (TPX), 1 to 5 percent of linear low density polyethylene (LLDPE), 1 to 4 percent of compatilizer, 0.1 to 2 percent of antioxidant, and 0 to 3 percent of other aid. By combining high transparency and excellent heat resistance and impact resistance of the TPX and combining the synergistic toughening of the LLDPE, the prepared modified polypropylene material keeps high rigidity of the polypropylene and improves the impact resistance of homo-polypropylene; and the prepared material also has good transparency, and can be used for making products with high requirements for transparency, heat resistance and impact resistance.

Inorganic bioactive material and method for preparing polymer porous composite material

Abstract: The invention discloses an inorganic bioactive material and a method for a polymer porous composite material The method comprises the following steps of: selecting a pore-forming agent with required particle size; mixing the inorganic bioactive material, polymer, an organic solvent and the pore-forming agent; placing an obtained mixture into a die and carrying out curing; and removing the pore-forming agent to obtain the porous composite material According to the invention, a die plate and the pore-forming agent can be synthesized and formed in one step by pressurization and polymerization; the process is simple; the uniformity and the continuity of pores are ensured; and a good environment can be provided for subsequent cell growth and tissue neogenesis Moreover, the prepared material has certain elasticity and has good ductility

Production method of aluminum-plastic wood fiber composite profile

Abstract: The invention relates to a production method of an aluminum-plastic wood fiber composite profile. The method comprises three steps. The first step is a material preparing step, wherein: (1) waste plastic or novel plastic is adopted as a main material; (2) plant fiber is adopted as an auxiliary material; (3) purchased mineral powder is adopted as a filling material; and (4) a chemical agent with a coupling effect is adopted as an additive. The second step is a mixing step, wherein 30-55% of the main material by weight, 38-55% of the auxiliary material by weight, 5-30% of the filling material by weight, and 2-6% of the additive by weight are placed in a mixer, and are processed into particles; and the particles are adopted as a raw material of an inner core, and are preserved for later use. The third step comprises a process that: a body of the profile is produced by using a co-extrusion equipment production line, wherein the prepared material used for producing the inner core of the profile body and a material of a protective film are placed in a hopper of an extruding machine, and the extrusion processing of the inner core and the protective layer is simultaneously achieved with a co-extrusion manner, such that the profile body is formed. The construction profile provided by the invention is advantaged in high quality, long service life, good durability, and wide application range.

Evaluation of polydopamine supported nano-polytetrafluoroethylene as a novel material for solid phase extraction

Abstract: A novel material for solid phase extraction (SPE) was prepared by the deposition of polydopamine onto nano-polytetrafluoroethylene (PTFE) using a simple self-assembly approach. The coated nano-PTFE was characterized by X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). The adsorption mechanism of the prepared material, as a SPE adsorbent, was investigated through static and dynamic adsorption experiments. Four alkaloids and two amino acids were used as model analytes. Several operation parameters including adsorption time and solution pH were optimized in the static adsorption mode. The coated nano-PTFE displayed a strong adsorption capability for four alkaloids, and isocorydione could be selectively adsorbed under the optimized pH. Hydrophobic and hydrogen-bonding interactions are the two main driving forces for the adsorption of the analytes. When the two coexist, the hydrogen-bonding interactions are more important than the hydrophobic effects. The prepared material exhibited almost opposite adsorption behavior compared with C18 silica without end-capping treatment. Therefore, polydopamine coated nano-PTFE can be used as packing material for a reverse phase HPLC column, instead of C18 with a tedious treatment of end-capping.

Thermosetting-resin-based carbon nano tube composite material and preparation method thereof

Abstract: The invention discloses a thermosetting-resin-based carbon nano tube composite material and a preparation method thereof The thermosetting-resin-based carbon nano tube composite material is obtained by uniformly mixing 100 weight parts of thermosetting resin and 025 to 3 weight parts of surface modified carbon nano tube at resin melting temperature, wherein the surface modified carbon nano tubeis a carbon nano tube of which the surface is grafted with hyper branched polysiloxane containing a phosphaphenanthrene structure and an epoxy group in a chemical bond form Compared with the thermosetting resin which is not modified, the prepared material has high tenacity and intensity, low curing temperature and excellent flame resistance on the basis of keeping the thermal resistance of the conventional thermosetting resin The adopted preparation method has the characteristics of high applicability, and simplicity

Organosilicon lens material for power type light-emitting diode (LED) packaging

Abstract: The invention relates to composition of a high performance organosilicon lens material for power type light-emitting diode (LED) packaging. The high performance organosilicon lens material is prepared by mixing raw materials such as organosilicon resin, epoxy modified organosilicon, a curing agent, a promoting agent and the like. The prepared material has high transmissivity and high refractive index in a wide wavelength range, and high high-temperature resistance, yellowing resistance and adhesion, and is suitable for packaging LED and devices thereof, solar cell array substrates, organic electroluminescence (EL) display elements, and serving as an optical lens, a plastic substrate for a liquid crystal display element, a substrate for a color filter, a touch tablet, a transparent panel, an optical element, an optical waveguide material and the like.

Preparation method for gold-containing hydrotalcite composite material

Abstract: The invention discloses a preparation method for a gold-containing hydrotalcite composite material, which belongs to the technical field of preparation of inorganic function materials The method comprises the following steps of: blending a soluble divalent metal salt, a soluble trivalent metal salt, a chloroauric acid solution and urea; performing a hydrothermal reaction by adopting a high-pressure reaction kettle; and performing a one-step reaction to obtain the gold-containing hydrotalcite composite material After the reaction is completed, gold exists hardly in a supernatant, and the utilization ratio of a precious metal, ie, gold is increased Meanwhile, gold is precipitated and dispersed among gaps of a hydrotalcite material in an ionic form in a synthesizing process, so that the dispersing degree of gold in the prepared material is higher The materials can be applied in the field of catalysis; and gold is uniformly dispersed among gaps of hydrotalcite, so that the durability of a catalysis material can be improved Specific to certain gas phase catalytic reactions, gas phase molecules can be expanded into gaps of the hydrotalcite for reacting, and gold in the gaps has the characteristics of stability, difficulty in running away and recyclability

Quickly-molded polypropylene composite material and preparation method

Abstract: The invention belongs to the field of plastic materials, and particularly relates to a quickly-molded polypropylene composite material and a preparation method of the composite material The composite material is prepared from the following raw materials according to a weight ratio: 60-86% of polypropylene, 5-20% of filler, 5-25% of toughener, 03-05% of nucleating agent, 2-5% of heat-conducting agent, 01-10% of heat stabilizer, and 01-10% of antioxidant, wherein the nucleating agent is beta-crystal-form nucleating agent Y-619; and the heat-conducting agent is a coated type nano thermal conduction material, which is composed of a common fine ore filler layer and a nano thermal conduction material layer coated on the surface of the fine ore filler layer According to the invention, the nucleating agent and the heat-conducting agent are added to a base formula of a polypropylene material, the nucleating agent is used for increasing PP (polypropylene) crystallization temperature and crystallization speed, and the heat-conducting agent is used for rapidly radiating heat generated during injection molding and shortening the cooling time, thus the molding rate of the polypropylene composite material is increased; and the preparation process is simple, the production efficiency is improved, the cost is lowered, and the physical mechanical performances of the prepared material are excellent

Preparation method of antibacterial halogen-free flame-retardant nylon alloy material

Abstract: The invention provides a preparation method of an antibacterial halogen-free flame-retardant nylon alloy material, belonging to the technical field of high polymer material preparation. The method comprises the following steps of: weighing 60-65 parts of nylon 66 resin, 30-35 parts of nylon 1010 resin, 20-30 parts of rubber, 0.8-1.6 parts of coupling agent and 28-35 parts of flame retardant in parts by weight and putting into a high-speed mixer for mixing, then putting 1.2-2 parts of antibacterial agent, 0.4-0.9 parts of oxidation inhibitor, 45-50 parts of chopped glass fiber and 0.3-0.8 parts of surface modifier weighed in parts by weight for continued mixing so as to obtain a granulation material; putting the obtained granulation material into a paralleled twin-screw extruder for melt extrusion, and controlling the extrusion temperature of the paralleled twin-screw extruder to obtain the antibacterial halogen-free flame-retardant nylon alloy material. The antibacterial halogen-free flame-retardant nylon alloy material has the following advantages that: the processing steps are short, the tensile strength is greater than 145 MPa, the flexural strength is greater than 215 MPa, thenotch impact strength of a cantilever beam is greater than 32 kj/m , the melt index is greater than 22 g/10min, the flame resistance reaches to V-0 (UL-94-1.6mm), and the prepared material can resist the bacteria erosion.

Honeycomb-reinforced phenolic foam material and preparation method thereof

Abstract: The invention relates to a honeycomb-reinforced phenolic foam material and a preparation method thereof, which belong to the field of polymer matrix composites. The honeycomb-reinforced phenolic foam material is characterized by taking phenolic foam as a matrix and a honeycomb material as a reinforcing material, wherein the honeycomb diameter of the honeycomb material is 1mm-10mm, and the slicing thickness of the honeycomb material is 1mm-10mm. The preparation method comprises the steps of completely dipping the honeycomb reinforcing material in the mixed raw materials, pre-foaming the material on a plate vulcanizing machine at 40-45 DEG C, and then heating and pressing the material on a plate vulcanizing machine at 85-95 DEG C for molding. The density of the prepared material ranges from 0.1g/cm to 0.25g/cm , and the material has favorable specific strength and fire resistance.

Preparation method of high length-diameter-ratio Cadmium Indium 204 (CdIn204) nano fiber material

Abstract: The invention relates to a preparation method of a high length-diameter-ratio Cadmium Indium 204 (CdIn204) nano fiber material Under the room-temperature condition, solution with mol ratio of soluble indium salts (indium nitride and indium acetate) and cadmium salts (cadmium nitride and cadmium acetate) being 5: 3 is prepared, polyvinylpyrrolidone is dissolved and used as a thickener, a dispersion stabilizer and a bond adjuster to be processed at the high temperature of 10 to 20KV by utilizing an electrostatic spinning technology to obtain a white precursor In(NO3)3, Cd(NO3) and PVP composite fiber The precursor is dried in a vacuum drying box at the temperature of 80 to 100 DEG C for 24h, then the precursor is thermally treated for 2h in a program heating furnace at a speed 1 to 10 DEG C/min under 800 DEG C, and then the precursor is naturally cooled to obtain one-dimensional pure CdIn204 nano fiber material By utilizing the electrostatic spinning method and an annealing route preparation method, easiness in operation is achieved, the purity of the prepared material is high, the crystal form of a product is complete, the material has advantages of large specific surface area, high length-diameter ratio and the like, and a large specific surface area can be provided for adsorbing gases, so that the prepared material has a good application prospect in the field of gas sensors

Preparation method of medical quick imbibition foam material

Abstract: The invention relates to a method for preparing a medical quick liquid-absorbing foam material. The method comprises the steps of well mixing polyvinyl alcohol aqueous solution, aldehyde and a pore-forming agent, adding acid to the mixture, continuing to stir the mixture, pouring the mixed solution into a die, curing and molding the mixed solution, washing and drying the obtained product and obtaining a target object. The material has abundant mutually communicated opening structures through a method of using mechanical foaming together with the pore-forming agent. The prepared material is good in biological compatibility and excellent in hydrophilcity, has the liquid-absorbing capability much higher than common cotton yarn and paper, has the capability of quickly absorbing a large amountof distilled water, physiological saline and urine, turns into soft tenacious elastic sponge after absorbing liquid, is resistant to heat and ultraviolet radiation, and can be disinfected in a plurality of ways. The prepared material is a rigid foam material in a dry state, is a spongy material in a wet state, has the apparent density of between 0.04 and 0.09 g/cm and the liquid-absorbing ratio of between 1,800 and 2,800 percent, and can be applied to medical operations.

Hot-pressing sintering TiB2-TiC-WC ultrahard material and preparation method thereof

Abstract: The invention relates to the technical field of new materials, especially to a hot-pressing sintering TiB2-TiC-WC ultrahard material and a preparation method thereof, wherein the components of the ultrahard precursor are as follows by weight percentage: 63-84% of TiB2-TiC, 10-25% of WC and 6-12% of Ni. The preparation method is as follows: putting the mixture powder of TiB2, TiC and WC mixed in proportion into a cylinder type ball milling machine; ball-milling for 24h by hard alloy and sieving by 200 meshes sieve; putting the material into a graphite container with the upper and lower parts enclosed; then putting into a high-temperature sintering furnace; and synthesizing TiB2-TiC-WC ultrahard material under the condition that the temperature rising speed is 50 DEG. C/minute, the temperature is 1500-1650 DEG. C and the heat preserving time is 40-70 min. The ultrahard material synthesized in the invention is high in purity; fine WC crystal particles are uniformly distributed around TiB2-TiC crystal particles; the size of WC crystal particles is 2-15 [mu]m; the size of the TiB2-TiC crystal particles is 5-15 [mu]m; and the bending resistant strength of the synthesized ultrahard material is 866.2MPa; the fracture toughness thereof is 5.6MPa.m0.5; and the hardness thereof is 21.32GPA. The prepared material is suitable for making a cutter for cutting and processing material having high hardness. The method has low cost, simple equipment and process and easy industrialization.

Method for preparing copper silicon alloy modified carbon/ceramic friction material

Abstract: The invention discloses a method for preparing a copper silicon alloy modified carbon/ceramic friction material, which comprises the following steps of: 1, thermally treating a carbon fiber prefabricated body at high temperature; 2, performing chemical vapor infiltration and (or) resin impregnation/carbonization densification treatment on the thermally-treated carbon fiber prefabricated body to obtain a low-density carbon fiber reinforced matrix carbon (C/C) porous material; 3, preparing Cu and Si infiltration powder; and 4, placing the Cu and Si infiltration powder into a graphite crucible, spreading the C/C porous material on the powder in the graphite crucible, performing non-immersion smelting infiltration in a high-temperature vacuum furnace, and compounding the C/C porous material and the powder to form the copper silicon alloy modified carbon/ceramic friction material through the reaction of Si and C, Si and Cu. The method has the advantages of simple and easily-controlled production process and low preparation cost; the prepared material has controllable microstructure and performance and excellent heat conducting performance; and the method can realize industrialized production, and has broad application prospect in the civil and military fields of airplanes, rapid trains, automobiles and the like.