为了进一步提高金属陶瓷的力学性能及其刀具的高速切削性能,研究了纳米增强金属陶瓷的显微组织特征和热冲击性能.扫描电镜和透射电镜分析表明:组织中陶瓷相呈现典型的芯-壳结构特征;芯为TiC或Ti(C,N),而壳则为(Ti,Mo,W)(C,N)固溶体.纳米增强金属陶瓷机制为细晶强化、弥散强化和固溶强化.热冲击实验表明:随着热循环的进行,材料中孔洞的数量、孔洞的尺寸以及微裂纹的尺寸随之增大;同时,热循环过程中出现的表面氧化、裂纹长大、偏转以及桥接现象也很显著.与常规Ti(C,N)金属陶瓷相比,纳米增强金属陶瓷的抗热冲击性能明显提高.
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