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高能球磨和热压烧结制备SiC/Ti_3SiC_2复相陶瓷及其性能

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Abstract:

以Ti,Si和C粉为主要原料,利用高能球磨及热压烧结制备了SiC/Ti3SiC2复相陶瓷。研究了工艺条件尤其是烧结温度和压力对合成产物相组成、微观结构及性能的影响,并结合X射线衍射、扫描电镜等检测结果探讨了Ti-Si-C体系反应合成机理。结果表明通过高能球磨18h,在25MP和1300oC热压,可得到均匀、致密的SiC/Ti3SiC2复相陶瓷材料。Si含量对SiC/Ti3SiC2材料的相组成及性能有较大影响。起始原料中的Ti,Si,C和Al的质量比为31.220.2时,材料性能提高明显,其弯曲强度、断裂韧性、密度和相对密度分别为526.65MPa,8.67MPa·m1/2,4.058g/cm3,89.78%。显微结构的观察表明,SiC/Ti3SiC2复合材料的断裂具有沿晶和穿晶混合断裂特征。SiC颗粒增韧抑制了微裂纹在Ti3SiC基体中的扩展。

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