亚微米级聚晶金刚石的高温高压合成  

Sub-Micron Polycrystalline Diamond Synthesis under High Temperature and High Pressure

作　　者：卢景瑞 寇自力[1] 刘腾[1] 张雷雷[1] 丁未[1] 张强[1] 王强[1] 杨鸣 龚红霞 贺端威[1] 

机构地区：[1]四川大学原子与分子物理研究所,四川成都610065

出　　处：《高压物理学报》2018年第2期52-58,共7页Chinese Journal of High Pressure Physics

基　　金：国家自然科学基金(11372143)

摘　　要：聚晶金刚石作为超硬材料具有很广泛的应用,常用于油气钻探、切削刀具、耐磨零件等领域。目前,工业上合成聚晶金刚石的内部晶粒尺寸一般都在微米量级以上,而合成微米级以下的聚晶金刚石则要面临很多困难。本工作使用熔渗法在高温高压的条件下合成了亚微米级聚晶金刚石,并对合成的样品进行了X射线衍射、扫描电子显微镜、电子背散射衍射、能谱、硬度等分析测试,结果表明:在5.5GPa、1 500℃、保温15min的情况下成功合成了维氏硬度高达57.0GPa的亚微米级聚晶金刚石;分层组装的方法可以使Co均匀地分散在聚晶金刚石样品中,呈现出圆孔状,从而保证样品具备均匀、优异的性能。同时,通过对烧结工艺的探索发现,温度和保温时间在亚微米级聚晶金刚石的合成过程中起着非常重要的作用。Due to its wide range of applications as a superhard material,polycrystalline diamond（PCD）has been used in oil-and gas-drilling,tool cutting,making of wear-resistant parts.At present,the average size of industrial synthetic PCD is above the micron dimension,but synthesizing the PCD with a size below the micron dimension remains a tough challenge.In this work,we succeeded synthesizing sub-micron polycrystalline diamond under high temperature and high pressure using the infiltrating technique.The samples were characterized by X-ray diffraction（XRD）,scanning electron microscope（SEM）,electron backscatter diffraction（EBSD）,energy dispersive spectrometer（EDS）and hardness test.These results show that the hardness of the PCD thus synthesized is 57.0 GPa under 5.5 GPa and 1 500℃ when the hold time of temperature is 15 min;that the Co can disperse uniformly in PCD as a round hole used the bi-layered assembly so that the PCD demonstrates uniform and excellent performance;and that it is found from its sintering process that the temperature and holding time play an important role in its synthetic process.

关 键 词：亚微米 合成 维氏硬度 高温高压 黏结剂 聚晶金刚石 

分 类 号：O521.2[理学—高压高温物理]