摘要
本文简要综述了哈尔滨工业大学纳米表面工程课题组最近十年来在硬质合金材料纳米改性方面的一些研究成果。稀土对硬质合金性能有明显的改善作用,但大多数研究都是在硬质合金中加入微米级的稀土。纳米表面工程课题组利用纳米材料的小尺寸效应、表面和界面效应等特征,通过向传统的WC硬质合金粉末料中(其中Co的质量分数为8%和11%)加入微量纳米级(50 nm)稀土改性剂进行强韧化改性,分别利用真空烧结和放电等离子烧结得到硬质合金块体。与现有的其它同成分硬质合金对比分析,纳米稀土改性后硬质合金的性能得到显著地提高,达到了既不提高很大成本又能提高使用性能的目的。
The research results of nano modification of hard alloys by nano surface engineering group in Harbin Insiti- tute of Technology in recent ten years are summarized in this paper. The modification of hard alloy by ＇rare earth elements is proved to be effective, but the former studies only focus on the modification of hard alloys by micron particles of rare earth. The nano rare earth particles （50 nm） were added into hard alloys to get results of strength and toughness improve- ments in nano surface engineering group. The mass fraction of Co in hard alloy is 8% and 11%. The hard alloy modified by nano rare earth was fabricated by the methods of vacuum-sintering and sparking plasma sintering. The mechanical properties of haid alloy modified by nano rare earth are evidently increased and the cost is decreased greatly, comparing to that of hard alloy with micron rare earth addition or without rare earth addition.
出处
《硬质合金》
CAS
2012年第1期53-59,共7页
Cemented Carbides
关键词
WC-Co纳米添加剂
力学性能
磨损性能
切削性能
WC-Co cemented carbide
nano-sized additive
mechanical properties
wear behavior
cutting property
