Sn含量对Cu基金刚石锯片胎体组织与硬度的影响  

Effect of Sn content on microstructure and hardness of Cu based diamond sawing matrixes

作　　者：李文生[1] 姜威[1] 冯力[1] 王磊[1] 路阳[1] 

机构地区：[1]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,兰州730050

出　　处：《粉末冶金材料科学与工程》2016年第3期457-462,共6页Materials Science and Engineering of Powder Metallurgy

基　　金：国家国际科技合作项目(2015DFR51090);国家外专局高端引智项目(GTD20156200088)

摘　　要：以Cu为基体,加入Co,Fe,Cr,Sn粉末,改变Sn含量,经过模压成形与热压,制备Cu基金刚石超薄切锯胎体材料,用显微硬度仪、金相显微镜(OM)、扫描电镜(SEM)和X线衍射(XRD)表征该胎体材料的显微硬度、组织和成分,研究Sn含量对胎体组织和硬度的影响。结果表明:采用烧结温度700℃、烧结压力8.2 MPa的工艺烧结出的胎体中,当Sn的质量分数为2%时,烧结Cu基锯片胎体平均硬度(HV0.1)最低为885.82 MPa;当Sn含量为12%时,烧结Cu基锯片胎体平均硬度最高为1 914.72 MPa。胎体中Sn含量从2%增加到6%,由于胎体中铜锡固溶体的含量增加,Cu基锯片胎体的平均硬度增加,胎体中Sn含量从8%增加到12%时,胎体中铜锡固溶体的含量减少,但是铜锡中间相含量增加,Cu基锯片胎体的平均硬度增加并达到最大值;胎体中Sn含量高于8%时,液态Sn会从胎体中流出,锯片与模具粘着严重,严重影响锯片成形率。Cu-based diamond composite ultra thin sawing matrixes were prepared through uniaxial die pressing and hot pressing technology using Cu based powders mixed with Co, Fe, Cr and Sn. The microhardness of Cu-based matrixes, microstructure and composition of hot pressed materials were investigated by microhardness tester, OM, SEM and XRD. The effect of Sn content on microstructure and microhardness of hot pressed Cu-based materials was also studied. The results show that the average hardness （HV0.1） of Cu-based materials is the lowest with 2% Sn, which is 885.82 MPa, and the highest with 12% Sn, which is 1914.72 MPa under the sintering condition of 700 ℃ and 8.2 MPa. With increasing Sn content from 2% to 6%, the contents of Cu and Sn solid solution increase, which leads to the increase of the average hardness. With the increase of Sn content from 8% to 12%, the content of Cu and Sn solid solution decreases but the content of mesophase of Cu and Sn increases, resulting in a maximum average hardness. The melt Sn will outflow, when the content of Sn is over 8%.

关 键 词：SN 单轴模冷压 热压 Cu基胎体 固溶体 硬度 

分 类 号：TF124[冶金工程—粉末冶金]