金刚石含量与粒度对钛铝氮结合剂/金刚石复合材料组织的影响  

Effects of diamond content and particle size on microstructure of Ti_2AlN ceramic bonded/diamond composites

作　　者：王艳芝[1] 徐世帅[1] 张旺玺[1] 梁宝岩[1] 

机构地区：[1]中原工学院材料与化工学院,郑州450007

出　　处：《粉末冶金材料科学与工程》2015年第6期865-872,共8页Materials Science and Engineering of Powder Metallurgy

基　　金：河南省教育厅重点项目(13A430132);河南省基础与前沿技术研究计划资助项目(132300410164);河南省省院科技合作项目(122106000051;142106000193);河南省教育厅自然科学研究计划资助项目(12A430024;13A430128;14A430007)

摘　　要：采用Ti、Al、TiN、石墨和金刚石粉体为原料,通过自蔓延高温烧结制备Ti_2AlN结合剂/金刚石复合材料,研究金刚石颗粒的含量和粒度对该复合材料的物相组成与显微形貌的影响。结果表明,原料粉末发生自蔓延反应,生成Ti_2AlN基体相,同时亦生成TiN、Al N和Al3Ti相,金刚石表面生成致密的TiC或Ti_2AlC。当金刚石粒度较粗(30/40,80/100目)时,金刚石表面反应程度较差,形成不连续的TiC与Ti_2AlC组织,基体的主相为Ti_2AlN。当金刚石粒度较细(W20)时,金刚石表面C元素与Ti充分反应生成TiC,基体主相变成TiC和TiN,未形成Ti_2AlN。当金刚石粒度为170/200目时,随金刚石含量增加,金刚石与基体元素的反应程度增加,基体中TiC和Al含量随之增加,而Ti_2AlN含量相应减少。Ti2AlN ceramic boned diamond composites were fabricated by self-propagation high temperature sintering （SHS） using Ti, Al, TiN and diamond powders as raw materials, and the effects of diamond content and particle size on phase composition and microstructure of the Ti2AlN ceramic bonded/diamond composites were studied. The results show that Ti2AlN mainly phase, TiN, AlN and Al3Ti phases are produced from Ti, Al, TiN and diamond powders by SHS. Diamond content and particle size have a significant impact on the state of diamond and the composition of matrix in composites. The dense TiC or Ti2AlC coatings are produced on the surface of the diamond by SHS. When diamond particle size is larger （30/40mesh, 80/100mesh）, the reaction on diamond surface is mild, discontinuous TiC and Ti2AlC coatings will be formed on the diamond surface, and the matrix composition is Ti2AlN phase mainly. When the diamond particle size is finer （W20）, C eleme.nt on diamond surface reacts sufficiently with Ti to form TiC, resulting in the main phase composition of matrix being TiC and TiN, and no Ti2AlN phase. When the adding diamond particle is 170/200 mesh, the diamond content is higher, the reaction degree of diamond is more serious. According TiC and Al content in the products increases, leading to Ti2AlN content decreasing.

关 键 词：Ti2AlN 金刚石 组织 

分 类 号：TG146.642[一般工业技术—材料科学与工程]