| 室温脱钴对PCD微观结构及力学性能的影响 |
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| 引用本文： | 张鹏,杨雪峰,陈冰威,黄雷波,骈小璇,栗正新,闫宁,王孝琪,孙冠男,张鹏飞,李志尧,司治华,陈强,宜娟,李金鑫.室温脱钴对PCD微观结构及力学性能的影响[J].金刚石与磨料磨具工程,2022,42(6):685-691. |
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| 作者姓名： | 张鹏 杨雪峰 陈冰威 黄雷波 骈小璇 栗正新 闫宁 王孝琪 孙冠男 张鹏飞 李志尧 司治华 陈强 宜娟 李金鑫 |
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| 作者单位： | 1.河南工业大学 材料科学与工程学院, 郑州 4500002.郑州新亚复合超硬材料有限公司, 郑州 4500003.郑州磨料磨具磨削研究所有限公司, 郑州 4500004.郑州钻石精密制造有限公司, 郑州 4500005.河南晶锐新材料股份有限公司, 郑州 4511006.河南亚龙金刚石制品股份有限公司, 郑州 4500007.富耐克超硬材料股份有限公司, 郑州 450000 |
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| 摘 要： | 为提高PCD使用过程中的热稳定性，选用硫酸-过氧化氢混合溶液在室温下对PCD进行脱钴处理，研究其脱钴机理及脱钴对PCD微观结构及力学性能的影响。通过SEM观察到PCD在室温脱钴48 h后表面出现较大深度的腐蚀坑，钴相基本被去除，上下表面脱钴深度分别为176 μm和162 μm；通过EDS可确定脱钴层剩余钴的质量分数为0.93%，而未脱钴层钴的质量分数为7.64%，表明87.83%的钴在实验中被硫酸-过氧化氢混合溶液溶解而去除。对PCD样品进行残余应力测量，脱钴之前的残余压应力为483.91 MPa，脱钴之后的残余压应力为330.35 MPa，后者相对前者减少31.73%，说明脱钴可以有效降低PCD内部残余压应力。
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| 关 键 词： | 聚晶金刚石 脱钴 硫酸-过氧化氢 残余应力 |
| 收稿时间： | 2022-04-18 |
Effect of room temperature cobalt removal on the microstructure and mechanical properties of PCD |
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| ZHANG Peng,YANG Xuefeng,CHEN Bingwei,HUANG Leibo,PIAN Xiaoxuan,LI Zhengxin,YAN Ning,WANG Xiaoqi,SUN Guannan,ZHANG Pengfei,Li Zhiyao,SI Zhihua,CHEN Qiang,YI Juan,LI Jinxin.Effect of room temperature cobalt removal on the microstructure and mechanical properties of PCD[J].Diamond & Abrasives Engineering,2022,42(6):685-691. |
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| Authors: | ZHANG Peng YANG Xuefeng CHEN Bingwei HUANG Leibo PIAN Xiaoxuan LI Zhengxin YAN Ning WANG Xiaoqi SUN Guannan ZHANG Pengfei Li Zhiyao SI Zhihua CHEN Qiang YI Juan LI Jinxin |
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| Abstract: | In order to improve the thermal stability of PCD during practical application, the mixed solution of sulfuric acid and hydrogen peroxide was selected to remove cobalt from PCD. The effect of decobaltization on microstructure and mechanical property of PCD as well as its mechanism were studied. According to the SEM results, several deep corrosion pits were observed on the surface of PCD after the 48 h decobaltization process under room temperature, indicating that the cobalt phase was almost removed. Besides, the depths of decobaltization on the upper and lower surfaces were 176 μm and 162 μm, respectively. Based on the EDS results, the remaining mass fraction of cobalt in the decobaltized layer was determined to be 0.93%, while that in the non-decobaltized layer was 7.64%. This suggested that 87.83% of cobalt was dissolved and removed in the mixed solution of sulfuric acid and hydrogen peroxide. The residual stress of PCD samples was also measured. The residual stress before and after decobaltization was 483.91 MPa and 330.35 MPa, respectively. The reduction of 31.73% indicated that decobaltization could effectively reduce the residual thermal stress in PCD. |
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