TiC 颗粒增韧 SiC 基复合材料及其冷处理研究

STUDY ON TiC PARTICLE TOUGHENING SiC MATRIX COMPOSITE AND ITS COOL TREATMENT

研究了ＴｉＣＰ粒径与ＴｉＣＰ／ＳｉＣ复合材料的抗弯强度和断裂韧性之间的关系，探讨了低温冷处理对复合材料性能的影响。结果表明：添加适宜粒径的ＴｉＣ颗粒能够提高ＳｉＣ材料的强度和韧性，但同时提高强度和韧性的粒径范围很窄。对复合材料进行低温冷处理，不仅可以进一步提高强度和韧性，而且可以改变增韧的粒径范围，使增韧和增强的粒径重合范围变宽。因此，形成一个较宽范围的强韧化区，为材料的强韧化设计和工艺的制定提供了依据。

The relationship between the flexural strength, fracture toughness and TiC particle size in TiCP/SiC composite was investigated. The effects of cool treatmemt on the properties of TiCP/SiC composite were studied. The results obtained show that the addition of TiC particle can enhance the strength and toughness of the composite, but there is only a very narrow particle size range of enhancing strength and toughness simultaneously. Cool treatment not only increases further the toughness and strength but also changes the toughening extent of TiC particle size, making wider the overlapped particle size extent of strengthening and toughening. Thereby, a strengthening and toughening region is formed. It provides the basis for designing the strengthening and toughening of materials and for formulating the corresponding technological process.