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Korean Journal of Metals and Materials > Volume 55(11); 2017 > Article
Korean Journal of Metals and Materials 2017;55(11): 790-797. doi: https://doi.org/10.3365/KJMM.2017.55.11.790
초 고온・고압 소결된 다결정 다이아몬드 컴팩트의 미세조직 및 마모 특성에 미치는 다이아몬드 입자 크기의 영향
백민석1, 박희섭2, 이재일2, 이기안1
1인하대학교 신소재공학과
2일진 다이아몬드㈜ 기술연구소
Effect of Diamond Particle Size on the Microstructure and Wear Property of High Pressure High Temperature (HPHT) Sintered Polycrystalline Diamond Compact (PDC)
Min-Seok Baek1, Hee-Sub Park2, Jae-il Lee2, Kee-Ahn Lee1
1Dept. Mater. Sci. Eng., Inha University, Incheon 22212, Republic of Korea
2ILJIN Diamond Co., Eumsung 27659, Republic of Korea
Correspondence  Kee-Ahn Lee ,Tel: +82-32-860-7532, Email: keeahn@inha.ac.kr
Received: 19 July 2017;  Accepted: 26 July 2017.  Published online: 31 October 2017.
A polycrystalline diamond compact (PDC) is a two-stage sintered body manufactured by placing diamond powders on a WC-Co hard material and then applying the high pressure high temperature (HPHT) sintering process. This study investigated the microstructure and wear properties of the PDC depending on initial diamond particle size. Three different sizes (12–22 μm, 10–20 μm, and 8–16 μm) of initial diamond powders were used to manufacture PDCs with the HPHT sintering process. Some Co and WC were observed along the boundaries between the diamond particles in the three manufactured PDCs. The diamond layer formed using small diamond particles showed finer and more even area distribution of Co along the diamond particles. VTL equipment was used to conduct a granite cutting wear test. The result confirmed that smaller initial diamond particle size leads to greater wear resistance properties. Observation of the PDC wear surface confirmed that the PDC made with larger diamond particles was more prone to be weak along the boundaries between the diamond particles, and there were instances where the diamond particles were displaced as a whole. For PDCs of smaller diamond particle size, abrasive wear occurred where the diamond particles were gradually worn away.
Keywords: polycrystalline diamond, high temperature high pressure sintering, wear, microstructure, diamond particle size
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