Research on Ti-Al inter metallic compound matrix FRM

纤维增强金属间化合物是一种很有前途的高温结构材料。材料的成型条件和使用条件决定了材料的力学性能。本文采用热压法制备了纤维增强金属间化合物，并对其力学性能进行了研究。研究结果如下：1.基体薄膜与SiC纤维之间的粘合过程采用热压成型时，要求基体薄膜之间以及薄膜与纤维之间具有良好的粘合性。为了估计热压的必要条件，提出了一种考虑塑性和蠕变变形机制的变形模型。在许多情况下，预测了热压充分粘合的必要条件。实验结果表明了该模型的适用性.在反应过程中，基体-纤维界面处的界面反应层成为断裂的起点。通过反应模型计算了复合材料的反应速率。实验结果表明了该模型的适用性.纤维增强金属间化合物是通过考虑上述两种工艺形成的。研究了其抗拉强度及其温度依赖性。提出了利用上述两种机制的预测体系可以形成充分的复合材料。

Fiber-reinforced inter metallic compounds are promising as structural materials in high temperature environments. The forming condition of the material and the using condition are result in the mechanical properties of the material. In this work, the Fiber-reinforced inter metallic compounds were formed using the hot-pressing and the mechanical properties were investigate. Result is summarized as follows ;1. on the adhesion process between the matrix film and the SiC fiber When the hot pressing is used to formed the materials, the perfect adhesion is required between the matrix film and between the film and the fiber. In order to estimate the necessary condition for the hot-pressing, an deformation model ,which takes account of the plastic and creep deformation mechanism, was proposed. The necessary condition of hot pressing for sufficient adhesion was predicted in many case. The experimental results suggest the applicability of the model.2. on the reaction process Inter facial reaction layer at the matrix-fiber interface became the start point of the fracture. The reaction rate for the composites was calculated by suing a reaction model. The experimental results suggest the applicability of the model.3. on the mechanical properties The fiber-reinforced inter metallic compound was formed by taking the two processes stated above into consideration. The tensile strength and the temperature dependence of it are investigated. It was suggested that the sufficient composite can be formed by using the prediction system of two mechanism stated above.