Showing papers on "Jet mill published in 2014"
Patent•
17 Mar 2014
TL;DR: In this article, an apparatus for synergistically combining a plasma with a comminution means such as a fluid kinetic energy mill (jet mill), preferably in a single reactor and/or in single process step is provided.
Abstract: An apparatus for synergistically combining a plasma with a comminution means such as a fluid kinetic energy mill (jet mill), preferably in a single reactor and/or in a single process step is provided by the present invention. Within the apparatus of the invention potential energy is converted into kinetic energy and subsequently into angular momentum by means of wave energy, for comminuting, reacting and separation of feed materials. Methods of use of the apparatus in the practice of various processes are also provided by the present invention.
217 citations
TL;DR: In this paper, a 3D numerical model was developed to accurately predict the jet-mill's behavior, and a discrete element model was used to predict particle motion while subjected to fluid forces calculated by computational fluid dynamics (CFD).
84 citations
TL;DR: In this article, three fractions of roller milled wheat flour were obtained using sieving: a coarse fraction (CF) with d50 −>200μm, a middle fraction (MF) with 100 −μm.
74 citations
TL;DR: To compare concentrations and morphologic characteristics of fumed (FS) and sol-gel silica nanoparticles (SS) in two manufacturing facilities, the number concentration (NC) and particle size were measured by a real-time instrument.
Abstract: Silica nanoparticles (SNPs) are widely used all around the world and it is necessary to evaluate appropriate risk management measures. An initial step in this process is to assess worker exposures in their current situation. The objective of this study was to compare concentrations and morphologic characteristics of fumed (FS) and sol-gel silica nanoparticles (SS) in two manufacturing facilities. The number concentration (NC) and particle size were measured by a real-time instrument. Airborne nanoparticles were subsequently analyzed using a TEM/EDS. SNPs were discharged into the air only during the packing process, which was the last manufacturing step in both the manufacturing facilities studied. In the FS packing process, the geometric mean (GM) NC in the personal samples was 57,000 particles/cm3. The geometric mean diameter (GMD) measured by the SMPS was 64 nm. Due to the high-temperature formation process, the particles exhibited a sintering coagulation. In the SS packing process that includes a manual jet mill operation, the GM NC was calculated to be 72,000 particles/cm3 with an assumption of 1,000,000 particles/cm3 when the upper limit is exceeded (5% of total measure). The particles from SS process had a spherical-shaped morphology with GMD measured by SMPS of 94 nm.
26 citations
TL;DR: In this article, the effect of different impact events on the development of the physical properties of dry Norway spruce wood in pulverisation was studied and it was proposed that media mills are capable of imposing higher energies and, consequently, cause stronger physical changes compared to impact-based non-media mills.
15 citations
TL;DR: In this paper, high purity Yb3+ doped Lu2O3 powder has been synthesized by the co-precipitation method using a commercial jet mill machine.
Abstract: High purity Yb3+ doped Lu2O3 powder has been synthesized by the co-precipitation method. The powders underwent a jet milling at various feed rate using a commercial jet mill machine. It is found that jet milling is very effective in breaking up of large agglomerates without cross-contamination. Median agglomerate size decreased from 8.74 μm to 1.06 μm when jet milled at a feed rate 0.75 lb/hr. There was no noticeable increase in impurities picked up during the jet milling process in the final powder obtained after a sacrificial run that was carried out for the purpose of conditioning the surface of the liner. Homogeneous, uniform, and highly transparent ceramic was obtained from the ceramic hot pressed with the final jet milled powder compared to the one made from as-produced powder where some defects and splotches are often observed. Transmission of the Yb3+:Lu2O3 ceramics obtained from the jet milled powder is very close to the theoretical limit, demonstrating the excellent quality of the transparent ceramic.
11 citations
TL;DR: In this article, the thermodynamic basic principles for generation and application of steam, and compressed gases are described, and a number of examples demonstrate that the energy requirement can be reduced by more than two by suitable choice of stabilizers.
Abstract: The interest in finer, dry products has led to the development of more efficient jet milling processes. The first part of the paper describes the thermodynamic basic principles for generation and application of steam, and compressed gases. Practical experience has shown that in the aspired fineness range stabilization during grinding provides an enormous potential for improvement. Some selected examples demonstrate that the energy requirement can be reduced by a factor of more than two by suitable choice of stabilizers.
10 citations
Patent•
02 Apr 2014
TL;DR: In this paper, a PVDF (Polyvinylidene Fluoride) fluorocarbon powder coating and a preparation method thereof is described. The preparation method comprises the steps: tabletting after fusing and mixing the raw materials, then, crushing the obtained tablets into particles with the diameters of 05-15cm; next, placing the particles into a target jet mill and milling finely; and screening to obtain particles with particle sizes of less than or equal to 30 microns.
Abstract: The invention relates to a PVDF (Polyvinylidene Fluoride) fluorocarbon powder coating and a preparation method thereof The coating is prepared from the following raw materials: 50-80 parts of PVDF resin, 2-10 parts of epoxy resin, 2-10 parts of acrylic resin, 10-20 parts of inorganic pigment, 1-2 parts of benzoin, 1-3 parts of a flatting agent, 1-2 parts of an adhesion promoter, 1-3 parts of fluororubber and 1-5 parts of boric acid The preparation method comprises the steps: tabletting after fusing and mixing the raw materials; then, crushing the obtained tablets into particles with the diameters of 05-15cm; next, placing the particles into a target jet mill and milling finely; and screening to obtain particles with particle sizes of less than or equal to 30 microns, thus obtaining the finished product of the PVDF fluorocarbon powder coating The preparation method disclosed by the invention is low in fusing and mixing temperatures and free of solvents so as to achieve energy-saving and environment-friendly effects; the defect that fluorocarbon resin is not easy to crush is overcome by using the target jet mill
7 citations
TL;DR: In this article, the authors developed a model of multi-stage classification and applied it to a fluidized bed-opposed jet mill, and the experimental identification of the model parameters was carried out.
Abstract: The research and modeling the classification effects in a fluidized bed opposed jet mill are presented. Particle distribution is the result of the interaction between two stages of classification in this mill: gravity classification above the bed, and centrifugal classification in a mill classifier. The objective of the study is to develop a model of multi-stage classification and apply in to the process in question. The universal algorithm of constructing the matrix model of arbitrary complex classification circuit is proposed and the example of its application to modeling the classification in the mill is presented. The experimental identification of the model parameters was carried out.
7 citations
Patent•
30 Jul 2014
TL;DR: In this article, a preparation method for high-coercivity sintered neodymium-iron-boron is described, which consists of batching raw materials proportionally, and preparing a thin alloy sheet by using a medium-frequency vacuum rapid-hardening melt-spinning furnace.
Abstract: The invention discloses a preparation method for high-coercivity sintered neodymium-iron-boron. The method specifically comprises the following steps: batching raw materials proportionally, and preparing a thin alloy sheet by using a medium-frequency vacuum rapid-hardening melt-spinning furnace; performing normal-temperature hydrogen absorption and heating dehydrogenation on the thin alloy sheet in a reaction kettle of a hydrogen decrepitating furnace to prepare coarse particles of which the particle size is 60-80 meshes; milling hydrogen-decrepitated coarse powder by using a jet mill to form fine powder of which the average particle size is 2.0-4.0 mu m; adding one or more rare-earth nano additives into the powder by using a jet method, and performing uniform mixing in the atmosphere of argon shielding; performing oriented molding and isostatic pressing on the mixed powder under the argon shielding through a 1.8-3.0T magnetic field; filling a green neodymium-iron-boron body into a vacuum sintering furnace in a closed glove box full of nitrogen, continuously sintering the green neodymium-iron-boron body for three times, quickly cooling the green neodymium-iron-boron body, and finally, aging the green neodymium-iron-boron body twice to prepare a corresponding neodymium-iron-boron magnet of which the performance meets the national standard. The method is low in cost, simple in process, energy-saving, environmentally-friendly, and high in rare-earth utilization rate.
7 citations
TL;DR: In this article, the formation of micronized fenofibrate using top-down process via jet mill and bottom-up process via rapid expansion of supercritical solution (RESS) was investigated.
Patent•
18 Jun 2014
TL;DR: In this paper, a method for preparing neodymium iron boron by using jet mill waste powder is described, which is characterized by comprising of pretreatment of raw materials, sieving, and pressing and molding.
Abstract: The invention provides a method for preparing neodymium iron boron by using jet mill waste powder The method is characterized by comprising the following steps: 1) pretreatment of raw materials; 2) sieving, namely putting mixed powder in the step 1) into a screening machine of which the sieve mesh number is 150-200 meshes to carry out sieving treatment, and standing for 5-8 hours after treatment is ended; 3) pressing and molding, namely putting the sieved powder into a molding press mold with stable gas protection, carrying out orientation in an orientation magnetic field of which the magnetic field strength is 14-20T and pressing and molding, so as to obtain a press billet; 4) carrying out post-treatment Wastes in the production process can be fully utilized, and changed into treasures, and the ingredients of the produced product are close to the range of the normal material ingredients, so that the antioxidant ability is improved, the product yield is improved, and the production cost is reduced Thus, the method has high social and economic benefits
Patent•
16 Apr 2014
TL;DR: In this paper, a method for producing silica-coated organic particles comprises: a cracking step of cracking raw material silica particles whose volume average particle diameter of the primary particles is 200 nm or less, in such a manner that a bulk density reaches 450 g/L or less by a jet mill.
Abstract: PROBLEM TO BE SOLVED: To provide silica-coated organic particles having excellent fluidity, and to provide a method for producing the same.SOLUTION: A method for producing silica-coated organic particles comprises: a cracking step of cracking raw material silica particles whose volume average particle diameter of the primary particles is 200 nm or less, in such a manner that a bulk density reaches 450 g/L or less by a jet mill; and a mixing step of mixing the silica particles obtained in the cracking step with organic particles having a volume average particle diameter larger than that of the silica particles to stick surfaces of the organic particles. By sticking the silica particles having the above characteristics to the surfaces of the organic particles, the stuck silica particles are interposed among the organic particles to improve the fluidity characteristics of the organic particles. The silica particles having the above characteristics constitute a powder in which the primary particles are separated from each other in spite of their particle diameters in the order of nanometer.
Patent•
14 May 2014
TL;DR: In this article, a safe and efficient mud drilling jet mill bit for horizontal wells is characterized in that a jet crushing device and a high-concentration turbulence sand-pumping device are mounted on a conventional bit.
Abstract: The invention discloses a safe and efficient mud drilling jet mill bit for horizontal wells. The safe and efficient mud drilling jet mill bit is characterized in that a jet crushing device and a high-concentration turbulence sand-pumping device are mounted on a conventional bit. The jet mill bit mainly comprises a jet crushing part and a high-concentration turbulence sand-pumping part. The jet crushing part is characterized by comprising reverse natural-vibration cavitation jet nozzles, mixing chambers, throat tubes, debris separation accelerating tubes, crushing targets, crushing chambers and bypasses; the high-concentration turbulence sand-pumping part is characterized by comprising well-bottom debris stirring and cleaning channels, debris suction tubes and bit nozzles. On the basis of principles of a sand pump, the debris suction tube and the well-bottom debris stirring and cleaning channel function in pumping high-concentration turbulence debris, so that well bottom pressure difference can be reduced effectively and mechanical drilling speed is increased; on the basis of the principles of the jet mill, debris is crushed further under hydraulic pulse cavitation jet effect, so that liquid and solid suspending flowing is achieved and debris beds formed in the horizontal wells is eliminated.
TL;DR: In this article, modern methods of fine milling and air classification of materials by the dry method, making possible precise sizing of particles as well as clean processing of the initial product without foreign impurities, are presented.
Abstract: In this article, modern methods of fine milling and air classification of materials by the dry method, making possible precise sizing of particles as well as clean processing of the initial product without foreign impurities, are presented. Special wear-resistant construction of the working units permits the finest milling and classification of even the hardest materials, including those with a hardness of up to 10 on the Mohs scale.
Patent•
11 Mar 2014
TL;DR: In this article, an alkaline grinding aid is added to the grinding gas before it is fed into the grinding chamber of the jet mill for micronisation of layered structure material having an interplanar distance ranging from 0.30 nm to 0.40 nm as measured by X-ray diffraction method.
Abstract: The present invention relates to a process for producing fine particles with a high aspect ratio and/or a low specific surface area by means of jet mills, wherein an alkaline grinding aid is added to the grinding gas before it is fed into the grinding chamber of the jet mill. The invention is directed to the micronisation of particles of layered structure material having an interplanar distance ranging from 0.30 nm to 0.40 nm as measured by X-ray diffraction method.
Patent•
23 Jul 2014
TL;DR: In this article, the authors presented a method for preparing ultra-fine grained titanium and titanium alloy from jet-milled titanium hydride powder by adding a small amount of paraffin wax into the well milled powder as forming agent.
Abstract: The invention belongs to the technical field of powder metallurgy and provides a method for preparing ultra-fine grained titanium and titanium alloy from jet-milled titanium hydride powder. The method comprises the steps of firstly preparing mixed powder of ultra-fine titanium hydride powder or titanium hydride powder and other powder by a jet mill, further adding a small amount of paraffin wax into the well milled powder as forming agent, pressing the powder added with the forming agent to form a blank sample in a certain shape, and placing the blank sample into a sintering furnace for degreasing and sintering; sintering out an ultra-fine grained sintered product with the relative density of above 95% by controlling the heating rate of the furnace, the type of atmosphere in the furnace, the pressure and the vacuum degree of the atmosphere, the degreasing and sintering temperature, the time and other process parameters; then placing the sintered product into a hot isostatic pressing furnace for high-pressure treatment so as to obtain a fully dense ultra-fine grained product. The method provided by the invention has the advantages of simple process and low cost, is suitable for a wide range of titanium alloy types and product sizes, and can realize mass production.
Patent•
23 Apr 2014
TL;DR: In this paper, the authors described a fluidized bed jet mill with a fan, a circulating pipeline, and an air inlet tee joint for high-speed fluidization of the bed jet.
Abstract: The invention discloses a circulating fluidized bed jet mill. A fan (1), a circulating pipeline I (2), an air inlet tee joint (6) and a circulating pipeline II (7) form a circulating channel, airflow is sucked from an air inlet valve (9) by the fan (1), materials are fluidized in the circulating channel and flow in a circulating manner at a high speed under the action of the airflow, the materials in the high-speed circulating flow process are crushed under the action of fan blades, pipe walls and mutual impact, and the circulating fluidized bed jet mill is simple in structure and high in efficiency.
Patent•
12 Nov 2014
TL;DR: In this article, a jet mill for smashing the lithium ion negative electrode material is described. But the work is limited to the case of a single battery and does not address the problem of high-speed rotation of the rotating millstone.
Abstract: The utility model discloses a jet mill for smashing a lithium ion negative electrode material, and aims at achieving the effects that the shape of a processed negative electrode material is perfected and the utilization rate of a product is increased. According to the technical scheme, the jet mill for smashing the lithium ion negative electrode material comprises a material feeding system, a ball milling system and a material discharging system which are connected in sequence. Compared with the prior art, the jet mill for smashing the lithium ion negative electrode material has the advantages that a plurality of trapezoid column bodies are arranged outside a rotating millstone in a milling bin of the jet mill; after the negative electrode material of a lithium ion battery, which is arranged in the rotating millstone, is thrown out under high-speed rotation of the rotating millstone and collides with the column bodies, particles with smooth surface areas can be formed; cyclically, the negative electrode material can be processed into a high-quality artificial negative electrode material which is good in shape, proper in particle size and high in yield.
Patent•
27 Aug 2014
TL;DR: In this paper, a disclosed jet pipe structure for a jet mill comprises a first jet pipe and a second jet pipe, and the front end of the inner wind ring branch pipe is fixedly connected with an inner wind pipe.
Abstract: A disclosed jet pipe structure for a jet mill comprises a first jet pipe and a second jet pipe; the first jet pipe is provided with an inner wind ring branch pipe, and the front end of the inner wind ring branch pipe is fixedly connected with an inner wind pipe; the second jet pipe is provided with an outer wind ring branch pipe, and the front end of the outer wind ring branch pipe is fixedly connected with an outer wind pipe; and the front end of the inner wind pipe and the rear end of the second jet pipe are in flange connection. According to the jet pipe, spiral blades uniformly distributed at a jet pipe head are uniformly separated, enter a sequential jet pipe along the inner wall, and also give play to effects of supporting the inner wind pipe and the jet pipe, so that the stress of single welding parts of the ring branch pipe is reduced, the rigidity of the whole part is increased, the jet effect of the jet pipe is improved and the service life is long.
Patent•
24 Sep 2014
TL;DR: In this article, a circulating reflux type jet mill is described, which consists of a ring-shaped jet milling bin, an air discharge base, air supply pipeline, a feed pipe and a discharge opening.
Abstract: The invention discloses a circulating reflux type jet mill which comprises a ring-shaped jet milling bin, an air discharge base, an air supply pipeline, a feed pipe and a discharge opening, wherein the ring-shaped jet milling bin is vertically arranged above the air discharge base, the air discharge base is provided with an air spray head connected to the bottom of the ring-shaped jet milling bin, the feed pipe is arranged below the ring-shaped jet milling bin to one side, and the side wall in the vertical direction inside the ring-shaped jet milling bin is fixedly provided with a plurality of milling cutting blades. The circulating reflux type jet mill disclosed by the invention has the advantages that the solid materials are milled circularly in the ring-shaped jet milling bin under the action of gravitation and high-pressure air; through a milling cutting blade structure inside the ring-shaped jet milling bin, the area of contact between solid granules and the shell of the ring-shaped jet milling bin is enlarged, the milling efficiency of the whole device is enhanced further, and the production cost is reduced; in addition, in cooperation with a feed pipe-discharge pipe structure, feeding is carried out conveniently when the device works; and the operation is convenient and flexible.
01 Jan 2014
TL;DR: In this paper, a model of the grinding and classification processes in the fluidized bed opposed jet mill based on the Markov chains approach was proposed and the methodology of modelling was elaborated and experimental research of the combined processes of grinding and classifying was carried out.
Abstract: A model of the grinding and classification processes in the fluidized bed opposed jet mill based on the Markov chains approach was proposed. The methodology of modelling was elaborated and experimental research of the combined processes of grinding and classification was carried out.
Patent•
07 Jan 2014
TL;DR: In this article, a high speed hulling device using a jet mill can be constructed by injecting high pressure air into a crushing chamber through a jet hole instead of an existing air nozzle in considering the properties of flexible aluminum and inducing the collision of inner particles.
Abstract: The present invention relates to a jet mill and a high speed hulling device using the same, wherein the jet mill can manufacture granules of 100-1000 μm by injecting high pressure air into a crushing chamber through a jet hole instead of an existing air nozzle in considering the properties of flexible aluminum and inducing the collision of inner particles to a maximum level by optimizing the number of the nozzle, air pressure, and entrance angle of air.
Patent•
23 Jul 2014
TL;DR: In this article, the authors proposed an improved air inlet structure for nozzles of a jet mill, which comprises a milling cylinder body and an annular air distribution disc provided with a gap.
Abstract: The utility model discloses an improved air inlet structure for nozzles of a jet mill. The improved air inlet structure comprises a milling cylinder body and an annular air distribution disc provided with a gap, wherein the air distribution disc is fixed on the circumference of the milling cylinder body, two ends of the gap of the air distribution disc are closed, air distribution space is formed in the air distribution disc and is communicated with an external compressed air source through an air inlet pipe and communicated with a plurality of nozzles through the air inlet pipe. According to the annular air distribution disc provided with the gap with the closed ends, the nozzles can be amplified and get closer to the inner wall of the milling cylinder body under equal air consumption amount, then the effective range of each nozzle is increased, larger impact force is acquired, materials close to the cylinder wall can also enter jet stream smoothly, and the milling efficiency and output of the whole jet mill are improved.
Patent•
22 Sep 2014
TL;DR: In this article, a pulverizing method of a gas absorbing material for an electricity storage device was proposed, where a jet mill body was used to pulverize the gas absorbing materials for the electricity storage devices so as to be a particle diameter of 50 μm or less.
Abstract: PROBLEM TO BE SOLVED: To provide a pulverizing method of a gas absorbing material for an electricity storage device and a pulverizer of the gas absorbing material for the electricity storage device where the gas absorbing material for the electricity storage device is pulverized so as to be a particle diameter of 50 μm or less and pulverized without absorbing moisture from air as much as possible.SOLUTION: A pulverizer 1 of a gas absorbing material for an electricity storage device comprises: a jet mill body 2 to pulverize the gas absorbing material for the electricity storage device so as to be a particle diameter of 50 μm or less; and a raw material charging device 3 to feed the gas absorbing material for the electricity storage device to be pulverized to the jet mill body 2. Dehumidified compressed air or nitrogen gas is fed to the jet mill body 2 and the dew point temperature of the raw material charging device 3 is controlled to be -20°C or less.
Patent•
17 Sep 2014
TL;DR: In this paper, a system consisting of a jet mill, a cyclone separator, a gas powder bag filter, and a titanium dioxide powder storage cabin is used to extract the titanium dioxide gas from the powder.
Abstract: The utility model relates to a system for preparing titanium dioxide gas powder The system comprises a jet mill, a cyclone separator, a gas powder bag filter and a titanium dioxide powder storage cabin, wherein the jet mill is used for pulverizing blocked titanium dioxide powder; the cyclone separator is used for separating the pulverized titanium dioxide powder to obtain the titanium dioxide gas powder and vapor; the cyclone separator is connected with the jet mill; the gas powder bag filter is used for filtering the vapor to obtain the titanium dioxide gas powder; the gas powder bag filter is connected with the cyclone separator; the titanium dioxide powder storage cabin is used for collecting the titanium dioxide gas powder from the cyclone separator and the gas powder bag filter; the titanium dioxide powder storage cabin is respectively connected with the cyclone separator and the gas powder bag filter The system can be utilized to effectively prepare the titanium dioxide gas powder
Journal Article•
TL;DR: In order to reduce the mechanical sensitivity of AP superfine powder, octadecylamine was used as the coating agent, and AP-coated superfine particles were prepared by jet mill as discussed by the authors.
Abstract: In order to reduce the mechanical sensitivity of AP superfine powder,octadecylamine was used as the coating agent,and AP-coated superfine particles were prepared by jet mill. The coating effect,thermal decomposition characteristics and sensitivity characteristics of AP-coated superfine particles were studied by particle size analysis,SEM analysis,DSC analysis and sensitivity testing. Experimental results show that particle size of AP-coated superfine particles is D50= 5. 8μm,with a coating layer present on the surface. Compared with the pure AP superfine particles,when the mass fraction of coating agent is 1%,the impact sensitivity of AP-coated superfine particles is reduced by 31. 2% and friction sensitivity is decreased by 12. 0%. While when the mass fraction of coating agent is 3%,the impact sensitivity of AP-coated superfine particles is reduced by 34. 5% and friction sensitivity is decreased by 22. 0%. In addition,the greater the coated dosage,the lower the impact sensitivity and the friction sensitivity. However,coating agent has some negative impacts on the thermal decomposition of AP,and thus its dosage should be controlled less than 1%( mass fraction).
Patent•
02 Apr 2014
TL;DR: In this article, a low-voltage apparatus electrical contact material and a preparation method of the preparation method is characterized in that nano-diamond and an aqueous solution of Ce3 cerium salt are uniformly mixed into a precursor by ultrasonic wave; the precursor is dried for 4h at the temperature of 90-100 DEC G, is loaded in a porcelain crucible, and is roasted for 1-2h under the temperature 600-850 DEG C in a vacuum sintering furnace.
Abstract: The invention discloses a low-voltage apparatus electrical contact material and a preparation method thereof. The preparation method is characterized in that nano-diamond and an aqueous solution of Ce3 cerium salt are uniformly mixed into a precursor by ultrasonic wave; the precursor is dried for 4h at the temperature of 90-100 DEC G, is loaded in a porcelain crucible, and is roasted for 1-2h under the temperature of 600-850 DEG C in a vacuum sintering furnace; a roasted product is smashed by a ball mill or a jet mill; after a wetting agent is added into and mixed with the smashed product, the mixed product and copper tungsten alloy powder are added into and uniformly mixed in a three-dimensional blender mixer in proportion; the mixed product is added into a mold for hot press molding and is sintered for 1.5-4h in the vacuum sintering furnace with the temperature of 1000 DEG C. The low-voltage apparatus electrical contact material has the advantages that the electrical contact material contains the nano-diamond, the dispersion strengthening function is realized, and the super-strong hardness and the wear-resisting property are realized; the diamond is super-strong in heat-conducting property, the surface temperature can be reduced, and the fusion welding and the electric ablation are resisted; the diamond is covered by cerium oxide, the electron work function is lower, the movement of an electric arc is dispersed, and the concentrated ablation on the contact material by the electric arc is reduced; the cost is greatly reduced as copper replaces silver.
Patent•
23 Jul 2014
TL;DR: In this article, a preparation method of silicon micropowder for high-density integrated circuit packaging, which comprises the following steps: (1) adding fused quartz sand with the particle size of 0.1-3mm into a milling cavity of a ball mill, milling for 25-35 minutes, and directly grading to obtain the silicon micro-drone with the medium particle sizes of 13-15 mu m for later use.
Abstract: The invention relates to a preparation method of silicon micropowder for high-density integrated circuit packaging, which comprises the following steps: (1) adding fused quartz sand with the particle size of 0.1-3mm into a milling cavity of a ball mill, milling for 25-35 minutes, and directly grading to obtain the silicon micropowder with the medium particle size of 13-15 mu m for later use; (2) adding fused quartz powder with the particle size of 8-10 mu m into a milling cavity of a jet mill, and carrying out jet pulverization for 1.5-2.5 hours, wherein the silicon micropowder with the medium particle size of 2.5-3.5 mu m can be sent to a grading region by the jet so as to be separated; and (3) adding the silicon micropowder milled by the ball mill and the silicon micropowder pulverized by the jet mill in a weight ratio of (6-7):2 into a mixer, and uniformly mixing to obtain the silicon micropowder for integrated circuit packaging. The silicon micropowder for high-density integrated circuit packaging has the advantages of uniform particle size distribution, favorable flowability, low viscosity, small surface area, high bulk density and high filling ratio (up to 85%), can be uniformly mixed with a resin to form a film, and can substitute spherical silicon micropowder.
Patent•
24 Dec 2014
TL;DR: In this article, the authors proposed a utility model for preparing a superfine spherical graphite, which is capable of meeting the requirements of a user by keeping the diameter of the crushed particles below 8 microns and sphering such small particles.
Abstract: The utility model relates to a spherical graphite material and in particular relates to a device for preparing a superfine spherical graphite. The device for preparing the superfine spherical graphite comprises a high-pressure jet mill, a mechanical jet mill, a grader and the like; the discharge hole of the high-pressure jet mill is connected with the inlet of the mechanical jet mill; the mechanical jet mill is connected with the grader; the grader is orderly connected with a dust remover and an induced draft fan; the lower discharge hole of the grader is connected with the feeding hole of the high-pressure jet mill by use of a pipeline. The device for preparing the superfine spherical graphite is capable of meeting the requirements of a user by keeping the diameter of the crushed particles below 8 microns and sphering such small particles.