Silver-coated glass microsphere core-shell composite particles were used as electric fillers, nitrile-butadiene rubber electric composite materials were prepared by rubber processingtechnology. The formula for compos...
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Silver-coated glass microsphere core-shell composite particles were used as electric fillers, nitrile-butadiene rubber electric composite materials were prepared by rubber processingtechnology. The formula for composite electric rubber material was studied, and the processing technical parameters of it were optimized. The influences of the quantity of shielding filler on the related properties of electric rubber materials were discussed, including conductive capability, mechanics properties and electromagnetic shielding effectiveness. The results showed that the composite electric rubber is light-weight rubber material and has good durability. With increasing volume fraction of electric fillers, the electric property and electromagnetic shielding effectiveness of the electric rubber material strengthen, its mechanics properties decline. And the volume fraction of the filler reached 40%, the volume resistivity of the rubber materials is 7.41 × 10-3 Ω · cm, it has good mechanics properties and electromagnetic shielding properties.
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.
Extrusion gelation freeform fabrication process is an extrusion-based freeforming technique capable of fabricating complex shaped monolithic ceramic prototypes by the sequential deposition and solidification of cerami...
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Extrusion gelation freeform fabrication process is an extrusion-based freeforming technique capable of fabricating complex shaped monolithic ceramic prototypes by the sequential deposition and solidification of ceramic suspensions from a computer aided design model. In this process, ceramic parts are produced using an extrusion nozzle suitable for extruding ceramic suspensions. In this study, the processing parameters influencing on manufacturing Al2O3 parts were discussed. Air pressure on top of suspensions, rotating speed of screw, nozzle diameter and scan speed are the main factors to influence the dimensional precision of ceramic bodies. By optimizing these processing parameters, the green bodies were fabricated with high precision. The sintered samples with homogenous microstructure and ∼97.6% relative density could be prepared by sintering of these green bodies at 1600°C for 2 hours.
Using the development tool C++ Builder and adopting object oriented programming method, the ceramic/metal gradient thermal barrier coating design software (CCDS) is developed according to software engineering criterio...
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Using the development tool C++ Builder and adopting object oriented programming method, the ceramic/metal gradient thermal barrier coating design software (CCDS) is developed according to software engineering criterion. The CCDS, which has user-friendly interface, is composed of three functional modules: preprocess module, analysis module and post process module. In addition, this software is attached with an optimal design module and an expert module. The calculation and design of the ceramic/metal gradient thermal barrier coating can be carried out by the CCDS, and the numerical results show good agreement with the analytical results.
e effect of sintering temperature on the microstructure, nonlinear electrical behavior, and dielectric properties of the Y2O3-doped WO3 ceramics was studied. The decrease in breakdown voltage directly relates to the g...
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e effect of sintering temperature on the microstructure, nonlinear electrical behavior, and dielectric properties of the Y2O3-doped WO3 ceramics was studied. The decrease in breakdown voltage directly relates to the grain growth of WO3 grains when increasing the sintering temperatures from 1050 to 1200 'C. The capacitor-varistor of WO3- 0.8 mol％ Y2O3 composite sintered at 1150 °C exhibits the maximal nonlinear coefficient of 3.5 and the highest dielectric constant of 1.13 x 104. However, higher sintering temperature than 1150 °C is not favorable for the nonlinear electrical behavior of the WO3 ceramics. The best nonlinear properties of the samples sintered at 1150 'C can be explained by the most efficient boundary barrier layer with can be formed sintered at the proper temperature.
Potassium lithium niobate (KLN:K3Li2Nb5O15) thin films have been deposited on quartz glass by pulsed laser deposition (PLD) technique using a stoichiometric KLN target, which was prepared by solid reaction with K2CO3,...
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Potassium lithium niobate (KLN:K3Li2Nb5O15) thin films have been deposited on quartz glass by pulsed laser deposition (PLD) technique using a stoichiometric KLN target, which was prepared by solid reaction with K2CO3, Li2CO3, and Nb2O5 powders as starting materials. X-ray diffraction (XRD) and Raman studies have revealed that tetragonal tungsten-bronze-type structure of KLN films with (310) preferred orientation could be achieved at the substrate temperature of 700°C and the oxygen partial pressure of 10 Pa. The average transmittance of as-deposited thin films in the visible range was nearly 90%.
The synthesis of Ti3AlC2/TiB2 composites was studied by in-situ spark plasma sintering with different volume content of TiB2. Results indicated the bulk Ti3AlC2/TiB2 was fabricated by SPS, which soaked for 8 min under...
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The synthesis of Ti3AlC2/TiB2 composites was studied by in-situ spark plasma sintering with different volume content of TiB2. Results indicated the bulk Ti3AlC2/TiB2 was fabricated by SPS, which soaked for 8 min under a pressure of 30 MPa at 1250°C. The properties of composites was great increased with the addition of TiB2;the Vicker's hardness increased with addition of TiB2 content, the maximum value is 10.4 GPa. The maximum flexural strength and fracture toughness reached maximum value, which were 696 MPa and 6.6 MPa·m1/2 when the volume content of TiB2 was 10%.
Based on the electrochemical model, a simulation model has been developed with Matlab/Simulink. Steady-state analysis has been developed to evaluate how the temperature affect the voltage and output power of the fuel ...
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Based on the electrochemical model, a simulation model has been developed with Matlab/Simulink. Steady-state analysis has been developed to evaluate how the temperature affect the voltage and output power of the fuel cell. Dynamic analysis focus on the dynamic response of the output voltage, the output power, the consumed power, the efficiency and the internal resistance of a single PEMFC when the current of a PEMFC increase or decrease transiently. This simulation model also adapted to the simulation of PEMFC stack. The study is helpful for the optimization and control of PEMFC.
The temperature field of two types of porous graded ZrO2 subjected to thermal shock loading is analyzed in this paper using the finite‐element method. The numerical simulation results indicate that the structure of Z...
The temperature field of two types of porous graded ZrO2 subjected to thermal shock loading is analyzed in this paper using the finite‐element method. The numerical simulation results indicate that the structure of ZrO2 with an un‐symmetric porous microstructure is superior to symmetric one and that, ignoring the influence of temperature dependent properties, the effects of thermo‐mechanical coupling can be ignored if the imposed heat flux density is less than 4 WM/m2.
The air plasma spray (APS) technology was used to prepare WC/NiCrAl and WC/NiCrBSi ceramic/metal composite wear preventive coating on cast iron substrate. The microstructure, microhardness, bond strength and slurry we...
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The air plasma spray (APS) technology was used to prepare WC/NiCrAl and WC/NiCrBSi ceramic/metal composite wear preventive coating on cast iron substrate. The microstructure, microhardness, bond strength and slurry wear preventive performance of coating was measured. The results revealed that all of the coating prepared by APS has good qualities. The coating with NiCrBSi as its combining metal is better than that with NiCrAl on wear preventive performance, and coating containing more WC is supreme than that containing less WC Finally, wear mechanics and the principle of the coating's wear preventive property was concluded.
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