王金芳,左敦稳,朱流,涂志标,戴晟

• 1:南京航空航天大学机电学院
• 2:台州学院机械工程学院

摘要(Abstract)：

对WC粉体进行化学活化预处理,然后采用超声辅助化学镀法制备低钴含量WC-Co(≤1 mass%)复合粉体,采用放电等离子烧结(SPS)技术,制备了少粘结相WC-Co硬质合金材料。研究了化学活化预处理工艺对WC粉体表面化学镀Co的影响以及少量均匀包覆的Co对试样烧结致密化过程、显微组织结构及力学性能的影响。试验结果表明:化学活化预处理后的WC粉体出现了大量的层错、位错等缺陷,在缺陷周围产生点阵畸变和应力场,较大的表面能减小了金属与陶瓷界面接触角,提高了二者之间的润湿性,降低了化学镀过程的形核功,实现化学镀钴过程;与纯WC粉体烧结试样相比,少量Co在WC-Co复合粉体中的均匀分布,大大降低了烧结温度,促进了粉体烧结致密化进程,各项性能得到显著提高,密度达15.56 g/cm3,硬度为2409 HV30,断裂韧性为9.2 MPa.m1/2。

关键词(KeyWords)： 化学镀法;WC-Co复合粉体;放电等离子烧结;化学活化;力学性能

Abstract:

Keywords:

基金项目(Foundation): 浙江省高等学校中青年学科带头人学术攀登项目(pd2013416);; 浙江省教育厅科研项目(Y201430375);; 江苏省普通高校学术学位研究生科研创新计划项目(KYLX_0228)

作者(Author): 王金芳,左敦稳,朱流,涂志标,戴晟

DOI: 10.13289/j.issn.1009-6264.2016.03.003

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