Transparent Fe-doped In2O3 thin film was prepared by sol-gel method on (general) glass substrate. The structure, morphologies, transmission and magnetic properties of the sample have been characterized by X-ray diffra...
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Transparent Fe-doped In2O3 thin film was prepared by sol-gel method on (general) glass substrate. The structure, morphologies, transmission and magnetic properties of the sample have been characterized by X-ray diffraction, field emission scanning electron microscopy, UV-Vis spectroscopy and vibrating sample magnetometer. XRD result indicated that the sample was single cubic In2O3 phase. FE-SEM clearly showed that the film was homogenous and composed of refining grain with an average size of 14 nm. UV-Vis spectrum indicated that the transmittance of the film was higher than 80% in the visible light, and the Fe-doped In2O3 film arose the optical absorption spectrum red shift. VSM demonstrated the sample was (room temperature ferromagnetic.
Titanium diboride (TiB2) was hot-pressed with 5% aluminum nitride (AlN) as a sintering at different sintering temperatures (1700-1900°C). The effects of sintering temperatures on microstructure and mechanical pro...
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Titanium diboride (TiB2) was hot-pressed with 5% aluminum nitride (AlN) as a sintering at different sintering temperatures (1700-1900°C). The effects of sintering temperatures on microstructure and mechanical properties were investigated. The results showed that the composites achieved the better properties when sintered at 1800°C.
Temperature distribution in the sample and the die during the process of Spark Plasma Sintering (SPS) were studied both theoretically and experimentally. The temperature difference is inevitable in the samples in SPS....
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Temperature distribution in the sample and the die during the process of Spark Plasma Sintering (SPS) were studied both theoretically and experimentally. The temperature difference is inevitable in the samples in SPS. Under certain conditions, the difference may reach a few hundreds of degrees of centigrade. Controlling of processing parameters can decrease the temperature difference. The atom diffusion at the interfaces and necks of specimen under SPS was also investigated and compared with Hot Pressing (HP). It was found that the atom diffusion in SPS is faster than that in HP, which indicates that SPS is more efficient.
A kind of Li2O-Al2O3-SiO2 system glass-ceramics, which had a low coefficient of thermal expansion, was prepared by melting method and used as the ramp-wave generator material. On one-stage light-gas gun, the experimen...
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A kind of Li2O-Al2O3-SiO2 system glass-ceramics, which had a low coefficient of thermal expansion, was prepared by melting method and used as the ramp-wave generator material. On one-stage light-gas gun, the experimental technique for quasi-isentropic compression via the ramp-wave generator was explored. By impacting the ramp-wave generator, quasi-isentropic compression waves with an extended wave's front were produced. The quasi-isentropic loadings to LY12-A1 samples were further realized via the ramp-wave generator. The results showed that the more the thickness of the ramp-wave generator, the longer the front of the generated waves and the lower the rate of the compression. The present research offered a feasible loading means for the quasi-isentropic compression under low pressures.
A multi‐particle 2D plane strain model was used to investigate the dynamic compressive properties of ceramic particle reinforced metal matrix composites (MMCs) in this paper. Ceramic particles were simulated as circl...
A multi‐particle 2D plane strain model was used to investigate the dynamic compressive properties of ceramic particle reinforced metal matrix composites (MMCs) in this paper. Ceramic particles were simulated as circles with different diameters, which were randomly and discretely embedded in the matrix. The constitutive relationship of ceramic material was characterized by Johnson‐Holmquist (JH‐2) damage model. The matrix was assumed to be power‐law strain hardening material, coupled with power‐law strain rate hardening. The ceramic/metal interface was assumed to be perfect. The predicted stress‐strain curves by the numerical models agreed well with those of experiments and unit cell analysis formulae developed by Bao and Lin [3]. The effects of overall strain rates and ceramic volume fraction on the dynamic behavior of the composites had been investigated by this numerical model. The effect of particles' distribution on the particles' damage was also discussed. The results show that the distribution and volume fraction of the particles have obvious effect on the particles' damage.
Mg-W composites with 0-92% W were prepared by spark plasma sintering (SPS) technique at 600°C-30 MPa-5 min. The mechanism of densification was researched and the relation between the mechanical property and the c...
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Mg-W composites with 0-92% W were prepared by spark plasma sintering (SPS) technique at 600°C-30 MPa-5 min. The mechanism of densification was researched and the relation between the mechanical property and the content of W was discussed. The results indicated that W and Mg exit in the composites through mechanical mixtures. The samples with low content of W were spread by partly molten Mg connecting the particles of Mg, the ones with high content of W through molten Mg joining the particles of W together. Increasing the content of W, elasticity modulus and bending strength increase, the Poisson's ratio decreases.
Spark plasma sintering(SPS) prepared transparent AlN ceramics by using different-content CaF2 as sintering aids, preparing porous materials and welding of alloys were researched. SPS shows its merits which could prepa...
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Spark plasma sintering(SPS) prepared transparent AlN ceramics by using different-content CaF2 as sintering aids, preparing porous materials and welding of alloys were researched. SPS shows its merits which could prepare transparent ceramics with high transparency in short time, prepare porous materials with homogeneous and controllable hole under low temperature in short time, obtain quite strong welding junction under low welding temperature and in short soaking time, owing to its special characters.
A new micromechanical method, called the Weighted Residual Self‐Consistent Scheme (WRSCS), is developed to study the effective thermal conductivity of particulate composites. WRSCS provides us with a new approach to ...
A new micromechanical method, called the Weighted Residual Self‐Consistent Scheme (WRSCS), is developed to study the effective thermal conductivity of particulate composites. WRSCS provides us with a new approach to the approximation of effective thermal conductivity of particulate composites with arbitrary phase geometry based on the thermal conduction theory of two‐phase materials within the framework of SCS. FE analyses of a generalized multi‐inclusion model and GSCS model are also carried out in the prediction of the effective thermal conductivity at different inclusion volume fractions. Results show that the effective thermal conductivity depends not only on the properties and volume fractions of its constituents, but also on the geometric shape of the particulate.
This paper used amino-terminated polyether, and amino-terminated polyurethane mixture as curing agent to cure the epoxy resin. A series of epoxy elastmors was gotten. The curing products of epoxy elastomers were chara...
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This paper used amino-terminated polyether, and amino-terminated polyurethane mixture as curing agent to cure the epoxy resin. A series of epoxy elastmors was gotten. The curing products of epoxy elastomers were characterized by DSC and FT-IR respectively. The fracture surface morphologies of the cured products were observed by scanning and transmission electron microscopy analysis. The results showed that the impact toughness of the cured products reaches 52.1 kJ/m2 and the elongation of fraction reaches 160% as well as good mechanical properties.
According to the low friction coefficient pairs under water-lubrication, which contain active pair and passive pair, their materials and performance were designed and studied in this paper. Friction experiments were o...
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According to the low friction coefficient pairs under water-lubrication, which contain active pair and passive pair, their materials and performance were designed and studied in this paper. Friction experiments were on three ceramic composite coatings of active pairs and three excellent friction material groups. Through a pin-on-disc configuration, friction coefficient and wear weight were tested. The morphology of the wear trace was observed by SEM. The discussion was on the constituent design and the microstructure of ceramic composite coatings, the tribological properties of the coatings and passive pair materials on the condition of water-lubrication. The results indicated that friction pairs of three ceramic composite coatings designed under water-lubrication has lower friction coefficient. This can endure better of the corrosion of the seawater and the adhesion of the microorganism, so it was an ideal friction module when it was used in the seawater.
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