Silicon carbide (SiC) ceramic with YAG (Y3Al5O12) additive added by sol-gel method was liquid-phase sintered at different sintering temperatures, and the sintering mechanism and microstructural characteristics of resu...Silicon carbide (SiC) ceramic with YAG (Y3Al5O12) additive added by sol-gel method was liquid-phase sintered at different sintering temperatures, and the sintering mechanism and microstructural characteristics of resulting silicon carbide ceramics were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and elemental distribution of surface (EDS). YAG (yttrium aluminum garnet) phase formed before the sintering and its uniform distribution in the SiC/YAG composite powder decreased the sintering temperature and improved the densification of SiC ceramic. The suitable sintering temperature was 1860 °C with the specimen sintered at this temperature having superior sintering and mechanical properties, smaller crystal size and fewer microstructure defects. Three characteristics of improved toughness of SiC ceramic with YAG added by sol-gel method were microstructural densification, main-crack deflection and crystal ‘bridging’.展开更多
The electrorheological (ER) suspensions containing the powders of silicone aluminum oxygen gel compilihentioned with PMMA and silicon oil were prepared. The viscosity of these suspensions and their influencing factors...The electrorheological (ER) suspensions containing the powders of silicone aluminum oxygen gel compilihentioned with PMMA and silicon oil were prepared. The viscosity of these suspensions and their influencing factors, such as electric field strength and particle concentration, were detected. By use of rare earth as agent to dope the samples, the experimental results show that, with the increasing of field strength and particle concentration, ER effect changes.展开更多
基金Project (No. 2004C31044) supported by the Science & TechniqueProject of Zhejiang Province, China
文摘Silicon carbide (SiC) ceramic with YAG (Y3Al5O12) additive added by sol-gel method was liquid-phase sintered at different sintering temperatures, and the sintering mechanism and microstructural characteristics of resulting silicon carbide ceramics were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and elemental distribution of surface (EDS). YAG (yttrium aluminum garnet) phase formed before the sintering and its uniform distribution in the SiC/YAG composite powder decreased the sintering temperature and improved the densification of SiC ceramic. The suitable sintering temperature was 1860 °C with the specimen sintered at this temperature having superior sintering and mechanical properties, smaller crystal size and fewer microstructure defects. Three characteristics of improved toughness of SiC ceramic with YAG added by sol-gel method were microstructural densification, main-crack deflection and crystal ‘bridging’.
文摘The electrorheological (ER) suspensions containing the powders of silicone aluminum oxygen gel compilihentioned with PMMA and silicon oil were prepared. The viscosity of these suspensions and their influencing factors, such as electric field strength and particle concentration, were detected. By use of rare earth as agent to dope the samples, the experimental results show that, with the increasing of field strength and particle concentration, ER effect changes.