碳纤维/铝复合材料界面化学反应产物的定量研究

Quantitative Study on the Interfacial Reaction Products of the Cf/Al Composites

设计了一种新的分析方法，采用气体体积测定法和反应气相色谱法联用以测定碳纤维／铝复合材料界面化学反应产物Ａｌ４Ｃ３的含量。当用单位纤维表面积所生成的Ａｌ４Ｃ３（Ｉ）来表征界面反应程度时，４６０℃、５４０℃下的动力学分析表明：Ｉ－ｔ图线性回归系数大于０．９，由此计算的界面反应扩散激活能为４９．２０ｋｃａｌ／ｍｏｌ。

A new analytical method was designed to determine the interaction product Al_4C_3 from Al/C composites,based on gas volumetric method combined with the reactiongas chromatography. Due to its high sensitivity, easy operating and good reproducibility,this method can be applied to analyze the minute reactions in the fiber/matrix interface which are difficult to be identified by other methods. Defining the content of Al_4C_3 produced per area of carbon fibers,or I, to characterize the degree of the interfacial reaction, I is in the range of 10μg/cm2。 The kinetic analysis at 460℃ and 540℃showed that the linear regression coefficients between I and t1/2were more than 09 and the activation energy of interfacial diffusion reaction is 4920kcal/mol.