摘要
以Ｓｉ和ＳｉＯ为硅化蒸气源，用ＣＶＲ和ＣＶＩ工艺对两种基体材料（纯石墨和Ｂ４Ｃ粒子改性石墨）进行了高温硅化处理，得到了四种复合材料：ＳｉＣ涂层／石墨（ＳＣ／Ｇ），梯度ＳｉＣ涂层／石墨（ＧＳＣ／Ｇ），ＳｉＣ涂层／Ｂ４Ｃ改性石墨（ＳＣ／ＢＧ）和梯度ＳｉＣ涂层／Ｂ４Ｃ改性石墨（ＧＳＣ／ＢＧ）。考察了四种复合材料在１２００℃的恒温氧化行为。同时也考察了梯度ＳｉＣ涂层／Ｂ４Ｃ改性石墨在１３００℃及经历了１０次（ΔＴ＝１０００℃）热冲击后的氧化行为。对复合材料的结构特征与其高温抗氧化的相关性进行了分析。
In this paper, CVR and CVI techniques were employed with Si(vapor) and SiO(g) as generators to siliconize two kinds of substrate materials(graphite and graphite modified by B 4C additives). Four kinds of composites were obtained: SiC coating/graphite, gradient SiC coating/graphite, SiC coating/ graphite modified by B 4C additives and gradient SiC coating /graphite modified by B 4C additives. Their isothermal oxidation behavior at 1 200℃ was investigated. Isothermal oxidation tests were also carried out at 1 300℃ for GSC/BG which has and has not undergone 10 times of thermal shock(Δ T =1 000℃). The relationship between oxidation resistance and structure of the composites were analyzed.
出处
《宇航材料工艺》
CAS
CSCD
北大核心
1999年第2期43-47,共5页
Aerospace Materials & Technology
