La_(2)O_(3)刻蚀对金刚石单晶性能的影响  

Effect of La_(2)O_(3) etching on the properties of diamond single crystal

作　　者：肖长江[1] 马金明 朱振东 栗正新[1] XIAO Changjiang;MA Jinming;ZHU Zhendong;LI Zhengxin(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,郑州450001

出　　处：《粉末冶金技术》2023年第1期79-83,共5页Powder Metallurgy Technology

基　　金：2022年度河南省教育厅重点科研项目(22B430015)。

摘　　要：以氮气为保护气氛,在820~980℃下用La_(2)O_(3)刻蚀人造金刚石单晶表面,研究稀土氧化物La_(2)O_(3)刻蚀对人造金刚石单晶性能的影响。利用扫描电子显微镜观测刻蚀后金刚石单晶不同晶面的表面形貌,通过人造金刚石单晶表面粗糙度、单颗粒抗压强度、抗冲击韧性和铜基结合剂金刚石节块抗弯强度来表征刻蚀前后金刚石单晶性能的变化。结果表明:La_(2)O_(3)对金刚石{100}面和{111}面的刻蚀是各向异性的;当刻蚀温度从820℃升高到980℃时,{100}面表面粗糙度从0.40μm增加至2.28μm,{111}面表面粗糙度从0.70μm增加到3.32μm,金刚石单颗粒的抗压强度由未刻蚀金刚石的576 N降低到最小530 N,冲击韧性由92.94%下降到89.21%。当金刚石体积分数为5%时,刻蚀后金刚石节块的抗弯强度增幅达到17.9%。The surface of the synthetic diamond single crystal was etched by La_(2)O_(3)at 820~980℃with the nitrogen as the protective atmosphere to systematically study the effect of La_(2)O_(3)etching on the properties of diamond single crystal.The surface morphologies of the etched diamond single crystal in the different crystal planes were observed by scanning electron microscope.The properties of the diamond single crystal before and after La_(2)O_(3)etching were characterized by surface roughness,single particle compressive strength,impact toughness,and bending strength of Cu-based bonder diamond segments.The results show that,the La_(2)O_(3)etching of the diamond in the{100}and{111}plane is anisotropic.When the etching temperature increases from 820℃to 980℃,the surface roughness of{100}plane increases from 0.40μm to 2.28μm,while the surface roughness of{111}plane increases from 0.70μm to 3.32μm.The single particle compressive strength of the diamond decreases from 576 N (without etching) to the minimum of 530N,and the impact toughness decreases from 92.94%to 89.21%.When the volume fraction of diamond is 5%,the bending strength of the etched diamond segment increases by 17.9%.

关 键 词：金刚石单晶 La_(2)O_(3) 各向异性 刻蚀 表面粗糙度 力学性能 

分 类 号：TG732[金属学及工艺—刀具与模具]