摘要
采用Ti(C,N)晶须和颗粒复合粉末(Ti(C,N)w+Ti(C,N)p)制备Ti(C,N)w/Ti(C,N)基金属陶瓷。研究了复合粉末对金属陶瓷组织及性能的影响。结果表明,Ti(C,N)w的加入,金属陶瓷的各项力学性能都得到了提高。组织表现为环形相结构特征,与Ti(C,N)基金属陶瓷相比,双层环形相结构所占比例增大,且尺寸加厚。烧结组织中Ti(C,N)w的长径比大于临界长径比,在强化金属陶瓷方面起着重要的作用。环形相使Ti(C,N)w与基体界面结合紧密,增韧机制主要表现为裂纹桥联和裂纹偏转,拔出效应不明显。
Ti（C,N）w/Ti（C,N）-based ceramets were produced using the self-made Ti（C,N）w＋Ti（C,N）p powders. Effects of Ti（C,N）w＋Ti（C,N）p addition on the mierostrueture and properties were studied. The resuhs suggest that mechanical performance is improved because of Ti（C,N）w＋Ti（C,N）p addition. Ti（C, N）w/Ti（C,N）-based eermets exhibit a core-shell structure. The content and size of dual-layer core-shell structure is increased in the Ti（C,N）w/Ti（C, N）-based cermets. The length/diameter ratio of Ti（C,N）w in ceramets is greater than the critical length/diameter ratio. Ti（C,N）w plays an important role in the strengthening cermets. The core-shell structures make the interface between Ti （C,N）w and substrate compact. The toughening mechanism of Ti （C,N）w/Ti（C,N）-based ceramets is crack bridging and crack deflection. Ti（C,N）w pullout is not evident.
出处
《硬质合金》
CAS
北大核心
2006年第3期129-133,共5页
Cemented Carbides
基金
863项目(2002AA331090)
中国博士后科学基金
