摘要
采用纳米Ti(C ,N)粉末制备Ti(C ,N)基金属陶瓷 ,研究了纳米粉末对金属陶瓷组织及性能的影响。结果表明 ,粉末冶金过程中 ,纳米Ti(C ,N)粉末易于在粘结相中扩散与溶解及沿晶界分布 ,降低了硬质相在粘结相中的溶解度 ,抑制了晶粒长大 ,提高了材料的红硬性能。抗弯强度与晶粒尺寸满足于Hall Petch公式 ,5wt%～ 10wt%的纳米粉末加入量可使金属陶瓷的抗弯强度和切削性能得到较大的提高 ,但硬度变化不大。切削磨损主要表现为磨粒磨损和轻微的粘着磨损 。
Ti(C,N)-based cermets were produced by adding Ti(C,N) nanopowders. Effects of Ti(C,N) nanopowders on the microstructure and properties of the cermets were studied. The results suggest that Ti(C,N) nanopowders suppress the growth of grain and improve red hardness because Ti(C,N) nanopowders, distributing along the interface of grains, easily diffuse and dissolve and the dissolubilitiy of hard grains decreases in the binders. Hall-Petch formula can describe the relationship between the tensile strength and grain size. The tensile strength and cutting performance are improved for the cermets with 5%～10wt% Ti(C,N) nanopowders. But the hardness doesn't change greatly. The morphology of cutting wear surface shows that the cutting wear is mainly the abrasive wear and slightly adhensive wear. The wear scars are small and uniform.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2003年第3期41-45,共5页
Transactions of Materials and Heat Treatment
基金
国家"8 63"高技术研究发展计划资助 (2 0 0 2AA331 0 90 )
中国博士后科学基金 (中博基金 2 0 0 1 [5]号 )
