【摘要】 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%。更多还原

【Abstract】 Through chemical vapor reaction (CVR) method, namely infiltrating silion vapor into pores of profabricated 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 oxidation resistance of carbon-carbon composite measured static oxidation tests. 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 65min at 1 160℃ in muffle is less than 2.6%, while weight loss of same-structure carbon-carbon composite with a density of 1.95g/cm~3 is up to 32% under the same test condition.更多还原