化学气相反应法在C/C复合材料抗氧化处理中的应用

Antioxidant treatment of carbon-carbon composite by means of chemical vapor reaction

通过把硅蒸气渗入预制体孔隙与碳直接反应生成SiC的化学气相反应(CVR)方法,提高初始密度和预制体结构均不同的C/C复合材料的抗氧化能力,研究了C/C复合材料的密度变化与微观结构,并对其进行了氧化试验。结果表明,因CVR温度、C/C复合材料初始密度不同,抗氧化处理后的密度增加量有显著不同。针刺炭布C/C/SiC复合材料在马福炉中于1160℃经65min氧化后,其失重率仅2.6%,而密度为1.95g/cm3的同结构C/C复合材料相在同条件下失重率高达32%。

Through chemical vapor reaction (CVR) method, namely infiltrating silicon vapor into pores of prefabricated part, then directly reacting with carbon to form silicon carbide at high temperature, the oxidation resistance of carbon-carbon composite with various initial density and prefabricated part structure can be improved. The density change and microstructure of carbon-carbon composite were studied, and the static oxidation tests of carbon-carbon composite is carried out. The results show that, with different CVR temperature and initial density of carbon-carbon composite, the density increment is significantly different after antioxidant treatment. The weight loss of needled carbon cloth C/C/SiC composite after oxidizing for 65 min at 1160°C in muffle is less than 2.6%, while weight loss of same-structure carbon-carbon composite with a density of 1.95 g/cm3 is up to 32% under the same test condition.