金刚石表面处理对铜基结合剂金刚石节块性能的影响  

Effect of Diamond Surface Treatment on Properties of Cu-Matrix Bonded Diamond Bits

作　　者：朱振东 肖长江[1] 栗正新[1] ZHU Zhen-dong;XIAO Chang-jiang;LI Zheng-xin(School of Materials Science and Engineering,Henan University of Technology,Zhengzhou 450001,China)

机构地区：[1]河南工业大学材料科学与工程学院,河南郑州450001

出　　处：《材料保护》2020年第11期84-87,135,共5页Materials Protection

摘　　要：为了验证金刚石表面处理对金属结合剂与金刚石间的把持力的影响,将人造金刚石、表面镀Ni金刚石和用MnO2刻蚀的金刚石加入到铜基结合剂中,用热压烧结法得到铜基结合剂金刚石节块,测试了节块的密度、硬度和抗弯强度,用扫描电镜(SEM)对节块断口的微观形貌进行了观测。结果表明:与表面未处理金刚石相比,表面处理对节块的硬度影响不大,但能使节块的抗弯强度提高。SEM分析表明:镀覆金刚石表面镀层能使金刚石与铜基结合剂的结合更紧密,而表面刻蚀的金刚石和结合剂之间能形成锚定结合,提高两者间的结合力。In order to verify the influence of diamond surface treatment on the holding force between the metallic bond and diamonds,the diamonds with different surface treatment (raw diamond,Ni-coated and MnO2-etched) were added to the Cu-matrix bond,and the Cu-matrix bonded diamond bits were obtained by a hot-pressing sintering method. Moreover,the density,hardness and flexural strength of the bits were measured,and the fracture morphology of the bits was observed by scanning electron microscope (SEM). Results showed that compared with the raw diamond,the surface treatment of the diamond had a small effect on the hardness,while the flexural strength of the bits could be improved to a certain extent. The SEM image analysis indicated that the coating on the surface of diamond could make the stronger bond between diamond and Cu-matrix,and the aiming combination between etched diamond and Cu-matrix was formed,which could effectively improve the bonding force.

关 键 词：金刚石 铜基结合剂 镍镀层 MnO2刻蚀 力学性能 微观结构 

分 类 号：TG732[金属学及工艺—刀具与模具] TQ153[化学工程—电化学工业]