(中南大学 粉末冶金国家重点实验室，长沙 410083)
摘 要: 对B(波音)757和B767飞机用C/C复合材料刹车盘试样的氧化行为进行了研究。在实验温度范围内，B757的刹车盘材料氧化损失率与温度有三段式关系，而B767的有二段式关系，所对应的氧化敏感温度分别约为600和700℃；在氧化敏感温度以上和以下氧化动力学曲线分别为直线型和指数型；B757刹车材料为2层薄炭毡中间夹1层纤维布组成的单元叠层构成，纤维布的纤维方向互成90°；B767刹车材料为无捻长纤维按一定角度旋转铺层，并在层面上辅加适量随机取向的短纤维束。材料氧化时首先在纤维与基体交界处氧化，基体炭氧化较深，纤维炭氧化成针尖状；但B757刹车材料的炭毡纤维氧化程度较深而成管状。
关键字: C/C复合材料；航空刹车副；氧化行为
composite for airplane brake disc
（State Key Laboratory for Powder Metallurgy,
Central South University,Changsha 410083,China）
Abstract:The oxidation behaviours of the C/C composites for Boeing 757 and Boeing 767 airplane brake disc were investigated.The relationship between the oxidation mass loss of the composite for B757 brake disc and test temperature is three-stage, and that for B767 brake disc is two-stage.The remarkable oxidation temperatures of the C/C composite for B757, B767 brake disc are 600℃, 700℃ resp ectively. The oxidation dynamic curve above the temperature is linear, the curve below the temperature is exponential. After the composite is oxidized deeply,the texture of carbon fibre can be observed clearly.The oxidation first occurs at the interface between carbon fibre and carbon matrix;the carbon matrix is oxidized more deeply than the carbon fibre,and carbon fibre is oxidized to become of a nedle-tip-like form. The oxidation finally makes the brake comp ositebereduced to fibre framework in the oxidized surface layer;but the fibre in carbon felt of the B757 brake composite is oxidized to become of a pipe-like form.
Key words: C/C composite；airplane brake disc；oxidation behaviour
