放电等离子烧结Ti_3SiC_2/金刚石复合材料的组织结构与磨削性能  

Microstructure and grinding property of Ti_3SiC_2/diamond composites fabricated by spark plasma sintering

作　　者：梁宝岩[1,2] 张旺玺[1,2] 冯燕翔[1,2] LIANG Baoyan ZHANG Wangxi FENG Yanxiang(School of Materials and Chemical Engineering, Zhongyuan University of Technology, Zhengzhou 451191, China National and Local Joint Laboratory of Engineering of Diamond Technology, Zhengzhou 451191, China)

机构地区：[1]中原工学院材料与化工学院,郑州451191 [2]金刚石技术国家地方联合工程实验室,郑州451191

出　　处：《粉末冶金材料科学与工程》2017年第3期399-406,共8页Materials Science and Engineering of Powder Metallurgy

基　　金：郑州市国际科技合作与交流项目(153PGJHZ209);河南省高等学校重点科研项目(17A430034);河南省高校创新团队项目(15IRTS THN004);河南省省院科技合作项目(142106000193);河南省教育厅科学技术研究重点项目(14A430007);河南省科技开放合作项目(142106000051);郑州市人才引育项目(141PRCYY514)

摘　　要：采用Ti_3SiC_2粉体和不同粒度的金刚石颗粒为原料,通过放电等离子烧结制备Ti_3SiC_2结合剂/金刚石复合材料,研究金刚石粒度与烧结温度对该材料的物相组成、显微形貌以及磨削性能的影响。结果表明,烧结过程中,Ti_3SiC_2分解生成Si与TiC_x。当金刚石粒度较细(W20)时,金刚石表面的C元素与TiC_x充分反应,生成厚度约为1μm的TiC过渡层,Ti_3SiC_2结合剂/金刚石复合材料中存在许多孔隙,烧结温度为1 200~1 400℃时,该材料的主相是TiC_x,TiC和Ti_3SiC_2,当温度升高至1 500℃时,主相为TiC,含有少量Ti_3SiC_2;金刚石粒度较粗时(30/40,120/140目),在1 200℃温度下烧结的复合材料的主相均为Ti_3SiC_2与TiC_x,1 500℃下烧结时,含30/40目金刚石的复合材料主相为TiC和Ti5Si3,含少量Ti_3SiC_2,含120/140目金刚石的复合材料主相为TiC,含少量Ti_3SiC_2。用粒度为120/140目的金刚石颗粒制备的Ti_3SiC_2结合剂/金刚石复合材料的磨削性能最好,当烧结温度为1 400℃时,磨耗比达到6 857。Ti3SiC2 ceramic boned diamond composites were fabricated by spark plasma sintering using Ti3SiC2 and diamond powders as raw materials. The effects of the content and particle size of diamond on phase composition, microstructure and grinding property of the composites were studied. The results show that the particle size of diamond has an obviously effect on the composition and microstructure of the composites. Ti3SiC2 may be decomposed to Si and TiCx （x〈1） during sintering. When diamond size is finer （W20）, C and TiCx on the diamond surface react to form TiC transition layer with a thickness of 1μm. There are many pores in the composites. When the particle size of the sintering temperature is 1200-1400 ℃, the main phases of the matrix are TiCx, TiC and Ti3SiC2. The main phases of the matrix are TiCx, TiC and Ti3SiC2 at 1 500 ℃. The main phases of the composite matrix contained coarse diamond （30/40, 120/140 mesh） are TiCx and Ti3SiC2 at 1200 ℃. The main phases of the composite matrix contained 30/40 mesh diamond are Ti5Si3, TiC and a little Ti3SiC2 at 1 500 ℃. The main phases of composite matrix contained 120/140 mesh diamond are TiC and a little Ti3SiC2 at 1 500 ℃. The composite contained 120/140 mesh diamond has optimal grinding property. When the sintering temperature reaches 1400℃, the grinding ratio is 6 857.

关 键 词：TI3SIC2 金刚石 放电等离子体烧结 组织 磨削性能 

分 类 号：TG146.642[一般工业技术—材料科学与工程]