(中南大學 粉末冶金國家重點實驗室，長沙 410083)
摘 要: 對B(波音)757和B767飛機用C/C復合材料剎車盤試樣的氧化行為進行了研究。在實驗溫度范圍內，B757的剎車盤材料氧化損失率與溫度有三段式關系，而B767的有二段式關系，所對應的氧化敏感溫度分別約為600和700℃；在氧化敏感溫度以上和以下氧化動力學曲線分別為直線型和指數型；B757剎車材料為2層薄炭氈中間夾1層纖維布組成的單元疊層構成，纖維布的纖維方向互成90°；B767剎車材料為無捻長纖維按一定角度旋轉鋪層，并在層面上輔加適量隨機取向的短纖維束。材料氧化時首先在纖維與基體交界處氧化，基體炭氧化較深，纖維炭氧化成針尖狀；但B757剎車材料的炭氈纖維氧化程度較深而成管狀。
關鍵字: C/C復合材料；航空剎車副；氧化行為
composite for airplane brake disc
XIONG Xiang, HUANG Bai-yun
（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
