摘要
采用自制的纳米TiC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TiC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,同时微观上造成局部富C和稳定了硬质相中的C含量,使金属陶瓷材料的环形相增多尺寸增厚。抗弯强度与晶粒尺寸满足于Hall Petch公式,5%～10%(质量分数)的纳米粉末加入量可使金属陶瓷的抗弯强度得到较大的提高,但硬度与晶粒尺寸的关系反Hall Petch公式。
Ti(C,N)-based cermets were produced using the self-made TiC nanopowders. Effects of TiC nanopowders on the microstructure and properties were studied. The results suggest that TiC nanopowders suppress the growth of grain because TiC nanopowders, distributing along the interface of grains, easily spread and dissolve and the dissolution of hard grains decreases in the binders. Wealthy C in part and stabilizing the content of C of hard grains make shell phase more and thicker. Hall-Petch formula can describe the relationship between the tensile strength and crystallite size. The tensile strength were improved when the content of TiC nanopowders was 5%～10wt%. But the relationship of hardness and crystallite size was contrary to Hall-Petch formula.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2003年第6期696-698,共3页
Journal of Functional Materials
基金
国家高技术研究发展计划资助项目(2002AA331090)
中国博士后科学基金资助项目(2001[5]号)
国家自然科学基金资助项目(50074017)
