摘要
本文介绍了一种在碱性电解液中电解聚晶金刚石内金属钴的方法。通过BSE观察到聚晶金刚石内金属钴的堆积方式有两种:大部分钴沿着金刚石颗粒边界延伸并包围金刚石颗粒,少量的钴团聚在一起,呈岛状堆积。EDS确定脱钴区域残余的钴含量为2.75%,而未脱钴区域的钴含量为13.45%,即79.5%钴在电解过程中溶解,且深度为170μm。模拟聚晶金刚石复合片在钻头胎体合金上面的焊接温度,对脱钴及未脱钴聚晶金刚石复合片进行热处理,用光学体式显微镜观察其表面的裂纹,采用XRD固定ψ法检测脱钴聚晶金刚石的残余热应力仅为241.46kg·mm-2,而未脱钴试样残余热应力值为2094.79kg·mm-2,即脱钴处理能有效降低聚晶金刚石复合片在下井使用前的热应力,使其残余热应力降低至原来的1/10。
To explore the residual stress of cobalt bound polycrystalline diamond originated from the thermal expansion of cobalt,the electrolyzed polycrystalline diamond was heated to 700℃ that the polycrystalline diamond cutter suffered from welding.BSE was employed to observe the manner of cobalt distributing in the polycrystalline diamond and EDS to determine the cobalt concentration.Certain incident angle 0°,15°,30°,45°were taken for XRD to measure the residual stress within diamond particles.The result showed that 79.5% cobalt was removed from the polycrystalline diamond and the depth of leached area was170μm.The certain angle incidence XRD revealed that the residual thermal stress in the treated sample was241.46kg·mm^-2,while that of the raw one（before treated）was 2094.79kg·mm^-2.
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2017年第1期87-90,118,共5页
Journal of Materials Science and Engineering
关键词
聚晶金刚石
脱钴
残余热应力
Polycrystalline Diamond
cobalt removal
residual thermal stress
