论文部分内容阅读
In this paper,the SiC fiber-reinforced SiC matrix composites with a 0.15μm thick pyrocarbon interphase(noted as SiC/PyC/SiC) were prepared by chemical vapor infiltration(CVI).The SiCf/PyC/SiC were oxidized in air at950 “C for 50 h.The dielectric properties after this high temperature oxidation were investigated in X-band from room temperature(RT) to 700℃.Results suggested that:ε′ of the SiC_f/PyC/SiC after oxidation increased at first then decreased with temperature elevating;ε″ increased with temperature raising in the temperature range studied.
In this paper, the SiC fiber-reinforced SiC matrix composites with a 0.15 μm thick pyrocarbon interphase (noted as SiC / PyC / SiC) were prepared by chemical vapor infiltration (CVI). The SiCf / PyC / SiC were oxidized in air at950 ”C for 50 h. The dielectric properties after this high temperature oxidation were investigated in X-band from room temperature (RT) to 700 ° C. Results indicated that: ε ’of SiC_f / PyC / SiC after oxidation increased at first then decreased with temperature elevating; ε "increased with temperature raising in the temperature range studied.