化学镀法制备低钴含量WC-Co复合粉体及其放电等离子烧结

材料热处理学报, 2016, 37(3): 12-17.

化学镀法制备低钴含量WC-Co复合粉体及其放电等离子烧结

王金芳 ^1, , 左敦稳 ^2, , 朱流 ^3, , 涂志标 ^4, , 戴晟 ^5,

1.南京航空航天大学机电学院,江苏南京210016;台州学院机械工程学院,浙江台州 318000

2.南京航空航天大学机电学院,江苏南京,210016

3.台州学院机械工程学院,浙江台州,318000

4.台州学院机械工程学院,浙江台州,318000

5.台州学院机械工程学院,浙江台州,318000

基金项目: 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)

关键词：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

Preparation of low Co-coated WC composite powder by electroless plating and its sintering by spark plasma sintering process

Keywords： electroless plating , WC-Co composite powder , spark plasma sintering , chemical activation , mechanical property

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.

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