Showing papers by "Bin Shen published in 2012"
TL;DR: In this paper, the authors simulated the temperature and gas density field inside the hot filament chemical vapor deposition (HFCVD) reactor, which played a determinate role on the growth rate and quality of as-deposited diamond films, and investigated the influence of the size and arrangement of filaments and inlets.
37 citations
TL;DR: In this article, the effect of silicon doping on the residual stress of CVD diamond films is examined using both X-ray diffraction (XRD) analysis and Raman spectroscopy measurements.
27 citations
TL;DR: In this paper, the effect of α-Al2O3 coating on the interface between nickel and SiC particle was investigated, and the results showed that Ni/CSp composites presented excellent thermal stability without interfacial reaction, while nickel silicide formed in the Ni/UCSp composite composites.
Abstract: This paper describes an investigation on the effect of α-Al2O3 coating on the interface between nickel and SiC particle. Uniform, dense and well-adhered α-Al2O3 coatings were obtained on the surface of SiC particles by sol–gel technology. The nickel-based composites reinforced with α-Al2O3-coated SiC particles (CSp) or uncoated SiC particles (UCSp) prepared by composite electrodeposition were heated at 600 °C to study the reactivity and the resulting interfaces. The results showed that the Ni/CSp composites presented excellent thermal stability without interfacial reaction, while nickel silicide formed in the Ni/UCSp composites. It indicated that high-temperature interfacial reaction between SiC particles and nickel matrix was efficiently inhibited by the α-Al2O3 coatings. Moreover, great differences of the local mechanical properties of interfaces were observed by the nanoindentation characterization.
21 citations
TL;DR: In this paper, Nanoplate-based hierarchical hollow spheres have been successfully synthesized using spontaneous oil droplets as the templates in a two-phase system and the growth process of the nanoplates of the hierarchical CuS hollow spheres can be controlled by changing the ripening time.
21 citations
TL;DR: In this article, hierarchical copper monosulfide (CuS) architectures composed of nanoplates have been successfully synthesized via a recrystallization growth process in a microemulsion system.
Abstract: Nano- and micro-sized hierarchical copper monosulfide (CuS) architectures composed of nanoplates have been successfully synthesized via a recrystallization growth process in a microemulsion system. In our method, the spatial separation of two reactants and low-reaction temperature can decrease the rate of growth of the CuS nuclei, resulting in the formation of the poorly crystallized CuS aggregates in an oil-in-water (o/w) microemulsion. The hierarchical CuS nanostructures are formed easily from poorly crystallized CuS by a recrystallization growth process at a higher temperature. Furthermore, the flowerlike CuS architectures can be obtained by a kinetically controlled dissolution–recrystallization mechanism. In addition, the photocatalytic activity of the hierarchical CuS architectures has been evaluated by the degradation of methylene blue solution in the presence of hydrogen peroxide under natural light, showing that the as-prepared hierarchical CuS architectures exhibit high-photocatalytic activity for the degradation of methylene blue.
14 citations
30 Oct 2012-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this paper, α-Al2O3-coated SiC particles were used as reinforcement for the fabrication of nickel matrix composites by electrodeposition and homogeneous coatings were obtained by the sol-gel method with a thickness of about 80nm.
Abstract: α-Al2O3-coated SiC particles were used as reinforcement for the fabrication of nickel matrix composites by electrodeposition. Homogeneous coatings were obtained by the sol–gel method with a thickness of about 80 nm. Both of the Ni/α-Al2O3-coated SiC (Ni/CSp) and Ni/uncoated SiC (Ni/UCSp) composites were heated at 600 °C to study the reactivity of nickel with SiC as well as the resulting interface, microstructure and mechanical properties. The results showed that the α-Al2O3 coatings protected the SiC particles from interfacial reaction, inhibited the formation of defects and nickel silicide, and thus improved the interface performance and achieved excellent mechanical properties for the Ni/CSp composite. The microhardness, yield strength and tensile strength of the Ni/CSp composite were all increased by 40%, 63% and 83%, respectively, compared with the Ni/UCSp composite. Moreover, the α-Al2O3 coatings also changed the fracture mechanism of the composites with heat treatment.
14 citations
TL;DR: In this paper, the effects of graphite content, load and rotation speed on the friction coefficient and wear resistance of Ni-P-Gr-SiC composites were investigated.
12 citations
TL;DR: In this paper, a layer of CVD diamond film is deposited on the interior-hole surface of compacting dies using the hot filament chemical vapor deposition (HFCVD) method, following by a surface polish process, aiming at further elongating the lifetime of the compacting die and improving the surface quality of produced wires.
Abstract: Silicon carbide (SiC) is a promising material for fabricating wire compacting dies due to its advantages of light weight and even high wear resistance over the tungsten carbide, which currently is the most popular material used to produce compacting dies. In present study, a layer of CVD diamond film is deposited on the interior-hole surface of compacting dies using the hot filament chemical vapor deposition (HFCVD) method, following by a surface polish process, aiming at further elongating the lifetime of compacting dies and improving the surface quality of produced wires. The characterization of both as-deposited and polished CVD diamond films is employed by scanning electron microscopy (SEM), surface profiler, Raman spectroscopy and X-ray diffraction (XRD) spectroscopy. Furthermore, the performance of as-fabricated CVD diamond coated compacting dies is examined in the real production process. The results exhibit that the as-deposited CVD diamond films are homogeneous and their surface finish is significantly smoothened after the surface polish process. As compared with the conventional compacting dies, the working lifetime of the diamond coated SiC compacting dies can be increased by a factor of above 15 and in the course of processing, copper stranded wires with high surface quality and uniform sectional area can be obtained.
8 citations
Patent•
01 Feb 2012
Abstract: The invention discloses a preparation method for the high-temperature high-differential pressure valve of a diamond coating, which belongs to the technical field of diamond manufacture. A preprocessed WC (Wolfram Carbide)-Co hard alloy YG6 or SiC/Si3N4 ceramic serves as a coating substrate material to prepare a diamond coating valve seat with a direct-pull perforation hot-wire method; the preprocessed WC-Co hard alloy YG6 serves as a coating substrate material to prepare a diamond coating valve plug with a step arrangement hot-wire method; finally, the valve plug is clamped by a valve plug clip and is fixedly connected with a valve rod by a thread and a pin; and the valve seat is thermally embedded into a pressing sleeve and passes through a bushing and a restriction orifice to be arranged in the cavity of a valve body to obtain the high-temperature high-differential pressure valve of the diamond coating. In the preparation method, the hot-wire chemical vapor deposition is adopted to realize by two technical schemes of the direct-pull perforation hot-wire method and the step arrangement hot-wire method, thereby greatly prolonging the service life of the original reducing valve, and bringing a significant meaning for guaranteeing the safe operation of the equipment.
7 citations
TL;DR: In this paper, short carbon fiber (SCF)-reinforced epoxy composites were prepared through changing of the fiber content (0.1-0.7 wt%). An electrodeposition process was used to produce Cu-coated SCFs.
Abstract: In this study, short carbon fiber (SCF)-reinforced epoxy composites were prepared through changing of the fiber content (0.1–0.7 wt%). An electrodeposition process was used to produce Cu-coated SCFs. To investigate the effect of Cu-coated SCFs on the composite mechanical and electrical properties, we prepared two kinds of reinforcements: SCFs treated by 400 °C (400 °C-treated SCFs) and Cu-coated SCFs (Cu-SCFs). Fracture characteristics of the composites revealed that the Cu coating and the epoxy matrix had a better interface, meaning that the tensile and bending strength results were better in epoxy/Cu-SCFs composites than those in epoxy/400 °C-treated SCFs composites. The 400 °C-treated SCFs decreased the electrical resistivity of the epoxy composites compared to the pure epoxy. However the epoxy/Cu-SCFs composites had lower electrical resistivity than epoxy/400 °C-treated SCFs with the same fiber content.
6 citations
Patent•
22 Aug 2012
TL;DR: In this article, a preparation method of an aluminum oxide coated SiC particle reinforced nickel-based composite material, which comprises the following steps of: selecting SiC particles and coating a sol-gel process; and carrying out codeposition by utilizing an electrodeposition method and taking nickel sulphamate as a main salt.
Abstract: The invention discloses a preparation method of an aluminum oxide coated SiC particle reinforced nickel-based composite material, which comprises the following steps of: selecting SiC particles and coating an aluminum oxide coating on the surface of the SiC particles by a sol-gel process; and carrying out codeposition by utilizing an electrodeposition method and taking nickel sulphamate as a main salt to prepare the aluminum oxide coated SiC particle reinforced nickel based composite material. In the nickel based composite material prepared by the preparation method, the combination of SiC reinforcing phase particles and the nickel base interface is excellent; and furthermore, the high-temperature interface reaction of the composite material is inhibited, the high-temperature mechanical properties of the composite material are excellent, and the application field of the composite material is further expanded.
Patent•
22 Aug 2012
TL;DR: In this paper, a method for plating tungsten on a surface of a SiC particle was proposed, which consisted of cleaning the surface of the siC particle by hydrofluoric acid, and roughening.
Abstract: The invention relates to a method for plating tungsten on a surface of SiC particle. The method comprises the following steps of: at first, cleaning the surface of the SiC particle by hydrofluoric acid, and roughening; secondly, carrying out activation-sensitization treatment on the surface of the SiC particle, which is scoured by the hydrofluoric acid, through PdCl2 solution and SnCl2 solution; thirdly, injecting ammonium meta-tungstate solution to carry out dipping treatment, which is supplemented by ultrasonic oscillation; at last, drying the SiC particle at low temperature, and reducing by hydrogen so as to obtain the SiC particle plated with the tungsten. The method, provided by the invention, has the advantages of simple process, convenient operation and low cost, the thickness of a tungsten plating layer is controlled conveniently, and the method has good application value in the field of SiC particle enhanced metal-based composites.
TL;DR: In this paper, the microstructure and cutting performance of micro-drone for applying to drill electrical discharge machining (EDM) graphite coated with MCD, FGD and NCD films are systematically investigated by means of field emission scanning electron microscope (FESEM) and Raman spectroscopy.
Abstract: In this study, micro- crystalline diamond(MCD), fine grade diamond(FGD) and nano- crystalline diamond(NCD) thin films are successfully coated on WC-Co micro drills(φ=400µm) adopting hot filament chemical vapor deposition (HFCVD) technique. The microstructure and cutting performance of micro drills for applying to drill electrical discharge machining(EDM) graphite coated with MCD, FGD and NCD films are systematically investigated by means of field emission scanning electron microscope(FESEM) and Raman spectroscopy. After drilling of 1500 holes, wear behavior of these micro drills is analyzed by FESEM and NCD coated micro drills exhibit minimum flank wear compared with the other samples due to the relatively good wear resistance and friction properties of NCD films.
Patent•
03 Oct 2012
TL;DR: In this article, a preparation method of a ferro-nickel alloy with adjustable thermal expansion performance is presented, which comprises the following steps of: preparing a Ferro-Nickel alloy alloy coating of a nanometer crystal grain size by adopting an electrodeposition method; and separating the obtained obtained ferroNickel Alloy alloy coating from a substrate, and performing thermal treatment by adopting different thermal treatment mechanisms for promoting the growth of ferro -nickel Alloy crystal grains to obtain the Ferro -NICKEL alloy with different thermal expansion performances.
Abstract: The invention discloses a preparation method of a ferro-nickel alloy with adjustable thermal expansion performance. The method comprises the following steps of: preparing a ferro-nickel alloy coating of a nanometer crystal grain size by adopting an electrodeposition method; and separating the obtained ferro-nickel alloy coating from a substrate, and performing thermal treatment by adopting different thermal treatment mechanisms for promoting the growth of ferro-nickel alloy crystal grains to obtain the ferro-nickel alloy with different thermal expansion performances. Compared with the prior art, the preparation method has the advantages that the ferro-nickel alloy which is treated by adopting the different thermal treatment mechanisms shows different thermal expansion performances, and the thermal expansion coefficient of the alloy is reduced along with the increase in the initial crystal grain size. Due to the adoption of the method, the ferro-nickel alloy with different thermal expansion performances is obtained on the premise of not changing the components of the alloy.
TL;DR: In this paper, the authors used FESEM, EDS, Raman spectroscopy and Rockwell hardness tester to characterize as-deposited boron-doped diamond (BDD) films.
Abstract: In the present investigation, titanium (Ti), silicon carbide (SiC), silicon (Si) and tantalum (Ta) samples with the same geometry are selected as substrates to deposite HFCVD boron-doped diamond films with the same deposition parameters, using trimethyl borate as the dopant. FESEM, EDS, Raman spectroscopy and Rockwell hardness tester are used to characterize as-deposited boron-doped diamond (BDD) films. The FESEM micrographs exhibit that the film deposited on Si substrate presents the best uniformity and that on Ti substrate has smallest grain size and film thickness, with titanium element detected in the EDS spectra. Moreover, it’s speculated by indentation test that the adhesive strength between the BDD films and different substrates can be order as SiC>Ta>Ti for the different thermal expansion coefficient gaps between the substrate and diamond, and the hardness of the BDD coated samples measured using Rockwell hardness tester can also be order as SiC>Ta>Ti due to the different hardness of substrate materials. Finally, similar and representative characterization for BDD films is obtained from the Raman spectra for all the BDD films on different substrates.
TL;DR: In this article, the cutting performance of as-fabricated CVD diamond coated inserts is evaluated in dry turning aluminum alloy and the uncoated WC-Co tool is also adopted in the cutting tests.
Abstract: CVD diamond coated inserts with different coating thickness are fabricated using hot filament chemical vapor deposition (HFCVD) method. Scanning electron microscope (SEM) and Raman spectroscopy are introduced to characterize the diamond films. The cutting performance of as-fabricated CVD diamond coated inserts is evaluated in dry turning aluminum alloy. The uncoated WC-Co tool is also adopted in the cutting tests for the sake of comparability. The testing results show that diamond coated tools exhibit much better cutting performance. Coating thickness affects the characteristics of diamond coated cutting tools, the thicker of coating, the more adhesive chips, but the better delamination resistant. The uncoated WC-Co tool suffers adhesive wear for the built-up edge (BUE) breaking.
Patent•
03 Oct 2012
TL;DR: In this article, an experiment device for simulating the damage failure of a conducting roller by work conditions is presented, which consists of a plating bath, bearing brackets, and a collecting ring connected with the upper roller.
Abstract: The invention discloses an experiment device for simulating the damage failure of a conducting roller by work conditions The experiment device comprises a plating bath, bearing brackets arranged on two sides of the plating bath as well as an upper roller and a lower roller which are arranged in the plating bath, wherein two sides of the upper roller and the lower roller are respectively connected with the bearing bracket; the lower roller is connected with a driving speed regulating motor through a coupling; the upper roller and the lower roller are connected through an upper driving gear and a lower driving gear; rolling bearings connected with the upper and lower rollers are arranged in the bearing brackets; a collecting ring connected with the upper roller is arranged between the plating bath and the bearing bracket; water cooling rotary connectors are connected to two ends of the upper roller; an upper roller polishing block is also connected to the upper roller and is connected with a reversible motor through a ball screw; an anode plate and an upper conducting roller are arranged in the plating bath; and a preheating supplement groove is also arranged in one side of the plating bath According to the experiment device disclosed by the invention, actual work conditions of the conducting roller can be simulated in multiple aspects; the simulation test for the damage failure of multiple conducting roller materials is developed; and a convenient and fast experiment method for developing new materials and processes is provided In addition, the experiment device is simple and convenient in operation and easy for popularization
Patent•
20 Jun 2012
TL;DR: In this article, a method for preparing ball-bar short carbon-fiber-reinforced epoxy resin matrix composite material, comprising: uniformly mixing the ball bar short carbon fiber and epoxy resins in a diluent, and heating to evaporate redundant diluents.
Abstract: The invention discloses a method for preparing ball-bar short carbon-fiber-reinforced epoxy resin matrix composite material, comprising: uniformly mixing the ball-bar short carbon fiber and epoxy resin in a diluent, and heating to evaporate redundant diluent; dropping a curing agent into the mixture ball-bar short carbon fiber and the epoxy resin after the diluent is evaporated, cooling, and solidifying in a forming die forming die under room temperature. The preparation method and flow of the invention are simple, and the ball-bar short carbon fiber can improve the interface combination between the short carbon fiber and the epoxy resin, thereby effectively transmitting stress. The obtained ball-bar short carbon-fiber-reinforced epoxy resin matrix composite material has important science value and actual application value for greatly enhancing mechanical property and reducing material cost.
Patent•
11 Apr 2012
TL;DR: In this article, a method for preparing a ball-rod-shaped short carbon fiber compound reinforcing body is presented. But the method is not suitable for the use of composite materials.
Abstract: The invention discloses a method for preparing a novel ball-rod-shaped short carbon fiber compound reinforcing body. The method comprises the following steps: 1) pre-treating the surface of a raw-material short carbon fiber; 2) preparing a conventional electro-deposition solution, adding the short carbon fiber subjected to surface pretreatment and a dispersing agent in the conventional electro-deposition solution, and uniformly dispersing the short carbon fiber; and 3) performing electro-deposition under a selected deposition voltage and deposition time, and after stopping the electro-deposition, taking down the short carbon fiber with metallic balls attaching on the surface, washing and firing in vacuum, thereby obtaining the ball-rod-shaped short carbon fiber compound reinforcing body. The preparation method provided by the invention is easy and feasible. The obtained ball-rod-shaped short carbon fiber compound reinforcing body can be used for reinforcing the interface bonding between the short carbon fiber and a resin matrix and reducing the possibility of inducing flaws by stress concentration at the end part of the short carbon fiber, thereby obviously improving the mechanical property of a resin-based compound material and achieving an important practical application value.
TL;DR: In this article, B-doped diamond films are investigated by scanning electron micrograph (SEM), Raman spectrum, X-ray diffractometry (XRD), and surface profiler.
Abstract: Si doped CVD diamond films are prepared on Si substrate by means of hot filament chemical vapor deposition (HFCVD) through adding tetraethoxysilane (TEOS) into acetone as source of reactant gas during the growth process. The samples of diamond films are investigated by scanning electron micrograph (SEM), Raman spectrum, X-ray diffractometry (XRD) and surface profiler. The experimental results show that compared with pure diamond film, Si doped CVD diamond film exhibits grain refinement and smoother surface. Then selective area deposition (SAD) of B-doped diamond films are achieved on both Si doped CVD diamond film and pure CVD diamond film with silicon dioxide layer as sacrificial layer. SEM investigation demonstrates that the boundary of patterning on pure diamond film is rather fuzzy while on pure diamond film it is trim and distinct, which is mainly attributed to the relatively low surface roughness.
TL;DR: In this article, a nonlinear FEM simulation is used to simulate the whole low carbon steel tube hollow sinking process, with 2D axi-symmetric elastic-plastic element.
Abstract: Diamond-coated drawing dies are considered as ideal drawing dies for their unique characteristics, such as high hardness, wear resistance and low friction. In order to utilize the superior characteristics of diamond coatings towards improving the drawing performance, the nonlinear FEM simulation is used to simulate the whole low carbon steel tube hollow sinking process, with 2D axi-symmetric elastic-plastic element. Based on the simulation results, the distributions of the axial stress and radial stress are analyzed, the influence of parameters of drawing dies on the diameter shrinkage is investigated. Optimal die parameters are obtained.
TL;DR: In this article, the atomic bonding state of as-deposited diamond-like carbon composite films was determined by the top-layered DLC film, which mainly consisted of amorphous carbon phase and no discernible sp3 characteristic peak can be observed from their Raman spectrum.
Abstract: The CVD diamond/diamond-like carbon composite film is fabricated on the WC-Co substrate by depositing a layer of Diamond-like Carbon film on the surface of conventional Micro- or Nano-crystalline diamond film. The hot filament chemical vapor deposition (HFCVD) method and vacuum arc discharge with a graphite cathode are adopted respectively to deposit the MCD/NCD and DLC films. A variety of characterization techniques, including filed emission scanning electron microscope (FE-SEM) and Raman spectroscopy are employed to investigate the surface morphology and atomic bonding state of as-deposited MCD/DLC and NCD/DLC composite film. The results show that both MCD/DLC and NCD/DLC composite films present similar surface morphology with the MCD and NCD films, except for scattering a considerable amount of small-sized diamond crystallites among the grain boundary area. The atomic-bonding state of as-deposited MCD/DLC and NCD/DLC composite films is determined by the top-layered DLC film, which is mainly consisted of amorphous carbon phase and no discernible sp3 characteristic peak can be observed from their Raman spectrum. Furthermore, the tribological properties of as-deposited MCD/DLC and NCD/DLC composite films is examined using a ball-on-plate reciprocating friction tester under both dry sliding and water-lubricating conditions, comparing with conventional DLC, MCD and NCD films. Silicon nitride balls are used as counterpart materials. For the CVD diamond/DLC composite films, the self-lubricating effect of top-layered DLC film is beneficial for suppressing the initial friction peak, as well as shortening the run-in period. The average friction coefficients of MCD/DLC and NCD/DLC composite films during stable sliding period are 0.07 and 0.10 respectively in dry sliding; while under water-lubricating condition, they further decreases to 0.03 and 0.07.