(中南大學(xué) 粉末冶金國家重點(diǎn)實(shí)驗(yàn)室，長沙 410083)
摘 要: 以全網(wǎng)胎炭氈為預(yù)制體，采用化學(xué)氣相滲透法(CVI)制備C/C坯體，然后采用反應(yīng)熔體浸滲法(RMI)將Cu和Si同時滲入坯體制得C/C-SiC-Cu3Si摩擦材料，研究復(fù)合材料的組織結(jié)構(gòu)和氧化行為。結(jié)果表明：C/C-SiC- Cu3Si復(fù)合材料的物相組成為C、Si、β-SiC和Cu3Si。在不同溫度相同時間氧化過程中，在700~1 000 ℃范圍內(nèi)，Cu3Si、Si和SiC氧化生成微量的SiO2；在1 000~1 300 ℃范圍內(nèi)，Cu3Si、Si和SiC同時氧化生成SiO2。但在不同時間相同溫度氧化過程中，Cu3Si氧化生成SiO2和CuO，部分Si和SiC氧化生成SiO2。這些SiO2和CuO覆在基體表面對內(nèi)部纖維和基體起到一定的保護(hù)作用。
關(guān)鍵字: C/C-SiC-Cu3Si復(fù)合材料；化學(xué)氣相滲透法；反應(yīng)熔體浸滲；氧化行為
（State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:C/C-SiC-Cu3Si composites were fabricated by react melt infiltration for infiltrating Cu and Si into C/C performs that were prepared by chemical vapor infiltration (CVI). The structures and oxidation behavior of the composites were investigated. The results show that the prepared composites contain C, Si, SiC and Cu3Si. In the non-isothermal oxidation process, Cu3Si, Si and SiC are oxidized into a little SiO2 in the temperature range from 700 ℃ to 1 000 ℃. Cu3Si, Si and SiC are oxidized into SiO2 between 1 000 and 1 300 ℃ at the same time. But for the isothermal oxidation process, Cu3Si are reacted with O2 into SiO2 and CuO, and parts of Si and SiC are oxidized into SiO2. The generated SiO2 and CuO covering the surface of substrate can protect the matrix and fiber to a certain extent.
Key words: C/C-SiC-Cu3Si composites; chemical vapor infiltration; react melt infiltration; oxidation behavior
