金刚石微粉粒径对聚晶金刚石复合片组织和性能的影响-中国材料进展

文章信息/Info

Title:: Effect of Diamond Particle Size on Microstructure and Properties of Polycrystalline Diamond Compact

作者:: 高中堂; 李雨燕; 彭腊梅; 丰德友; 王斌奇; 高志明; 张传伟; 于源; 1. 西安科技大学机械工程学院，陕西西安 710054 2. 陕西太合智能钻探有限公司，陕西西安 712000 3. 中国科学院兰州化学物理研究所固体润滑国家重点实验室，甘肃兰州 730000

Author(s):: GAO Zhongtang; LI Yuyan; PENG Lamei; FENG Deyou; WANG Binqi; GAO Zhiming; ZHANG Chuanwei; YU Yuan; 1. College of Mechanical Engineering, Xi’an University of Science and Technology, Xi’an 710054, China 2. Shaanxi Taihe Intelligent Drilling Co., Ltd., Xi’an 712000, China et al.

Keywords:: size of diamond; polycrystalline diamond compacts; wear ratio; thermal stability; impact toughness

摘要:: 聚晶金刚石复合片（PDC）性能与金刚石粒径大小、金刚石颗粒的分散均匀性以及Co粘结剂在金刚石颗粒之间的分布状态密切关。采用高温高压烧结制备金刚石粒径分别为3，10，16和25 μm的PDC，通过X射线衍射仪、扫描电子显微镜、同步热分析仪、高速摩擦磨损实验和抗冲击实验，研究了不同金刚石粒径的PDC的物相组成、显微组织、热稳定性、摩擦系数和抗冲击韧性。结果表明，不同金刚石粒径的PDC的最强的衍射峰分别对应于金刚石(111)、(220)、(311)晶面，且仅在金刚石粒径为25 μm的PDC中发现Co3O4相；金刚石粒径为3，10，16和25 μm的PDC微观组织中Co粘结剂分别以微粒、“球状”和“孤岛状”、“叶脉状”和“孤岛状”、“叶脉状”分布；金刚石粒径为25 μm的PDC摩擦系数最小，为0049。性能测试结果表明，粒径为10 μm的PDC性能表现最佳，磨耗比达到了204×106，抗冲击韧性为400 J，耐热温度达到了744 ℃。

Abstract:: The performance of polycrystalline diamond composite sheet (PDC) is closely related to the diamond particle size, the dispersion uniformity of diamond particles and the distribution state of Co binder among diamond particles. PDC with diamond particle size of 3, 10, 16 and 25 μm were prepared by sintering at high temperature and high pressure. The phase composition, microstructure, thermal stability, friction coefficient and impact toughness of PDC with different diamond particle size were studied by X-ray diffractometer, scanning electron microscope, synchronous thermal analyzer, high-speed friction and wear test and impact resistance test. The results show that the strongest diffraction peaks of PDC prepared with different particle sizes are (111), (220), and (311). Moreover, the Co3O4 phase is found in the PDC with a diamond particle size of 25 μm. The Co binder of PDC with diamond particle sizes of 3, 10, 16 and 25 μm are distributed in the forms of fine particles, spherical and isolated shapes, vein-like and isolated shapes, and vein-like shapes, respectively. The PDC with a diamond particle size of 25 μm has the smallest friction coefficient, which is 0.049. The performance test results show that the PDC with particle size of 10 μm has the best performance, the wear ratio reaches 2.04×106, the impact toughness is 400 J, and the heat resistance temperature reaches 744 ℃.