Influence of multi-component alloy binder on diamond skeleton formation in PCD

IF 4.2 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-07-16 DOI:10.1016/j.ijrmhm.2025.107329

Jiangmei Yang , Tianxu Qiu , Li Wang , Guoqin Huang , Yong Liu

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Abstract

HPHT-synthesized polycrystalline diamonds (PCD) exhibit ultrahigh hardness, widely used in cutting and drilling tools. The mechanical strength, primarily dependent on diamond skeleton formation, is significantly influenced by the alloy binder. In this study, PCDs were prepared using 3 multi-component alloy binders: Co₆₀Ni₃₀Cr₆C₄, (Co₆₀Ni₃₀Cr₆C₄)₉₄Ti₃Al₃, and (Co₆₀Ni₃₀Cr₆C₄)₉₀Ti_2.5Zr_2.5Al₅ under HPHT conditions. The results show that (Co₆₀Ni₃₀Cr₆C₄)₉₀Ti_2.5Zr_2.5Al₅-PCD achieves the highest transverse rupture strength (approximately 891 MPa), which is 35.6 % and 13.8 % higher than that of Co₆₀Ni₃₀Cr₆C₄-PCD and (Co₆₀Ni₃₀Cr₆C₄)₉₄Ti₃Al₃-PCD, respectively. This improvement is attributed to the formation of a well continuous and interconnected diamond skeleton, most probably facilitated by increased generation of fine diamond grains which effectively bridge these particles. Additionally, the carbides formed under HPHT conditions in the (Co₆₀Ni₃₀Cr₆C₄)₉₀Ti_2.5Zr_2.5Al₅-PCD can strengthen diamond-binder interfacial bonding. This study provides useful insights for designing new alloy binder to synthesize PCD under HPHT while also deepening the understanding of the formation mechanisms of the diamond skeleton within PCD.

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多组分合金粘结剂对PCD中金刚石骨架形成的影响

hpht合成的多晶金刚石（PCD）具有超高的硬度，广泛应用于切削和钻井工具。机械强度主要取决于金刚石骨架的形成，受合金粘结剂的显著影响。本研究采用Co60Ni30Cr6C4、（Co60Ni30Cr6C4）94Ti3Al3和（Co60Ni30Cr6C4）90Ti2.5Zr2.5Al5 3种多组分合金粘结剂在高温条件下制备了pcd。结果表明，（Co60Ni30Cr6C4）90Ti2.5Zr2.5Al5-PCD的横向断裂强度最高，约为891 MPa，分别比Co60Ni30Cr6C4和（Co60Ni30Cr6C4）94Ti3Al3-PCD高35.6%和13.8%。这种改进归因于形成了一个连续且相互连接的金刚石骨架，很可能是由于增加了细金刚石颗粒的产生，有效地桥接了这些颗粒。高温条件下（Co60Ni30Cr6C4）90Ti2.5Zr2.5Al5-PCD中形成的碳化物可以强化金刚石-粘结剂的界面结合。该研究为在高温高压下合成PCD的新型合金粘结剂的设计提供了有益的见解，同时也加深了对PCD内金刚石骨架形成机制的理解。

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来源期刊

$International Journal of Refractory Metals & Hard Materials$

International Journal of Refractory Metals & Hard Materials 工程技术-材料科学：综合

CiteScore

7.00

自引率

13.90%

发文量

236

审稿时长

35 days

期刊介绍： The International Journal of Refractory Metals and Hard Materials (IJRMHM) publishes original research articles concerned with all aspects of refractory metals and hard materials. Refractory metals are defined as metals with melting points higher than 1800 °C. These are tungsten, molybdenum, chromium, tantalum, niobium, hafnium, and rhenium, as well as many compounds and alloys based thereupon. Hard materials that are included in the scope of this journal are defined as materials with hardness values higher than 1000 kg/mm2, primarily intended for applications as manufacturing tools or wear resistant components in mechanical systems. Thus they encompass carbides, nitrides and borides of metals, and related compounds. A special focus of this journal is put on the family of hardmetals, which is also known as cemented tungsten carbide, and cermets which are based on titanium carbide and carbonitrides with or without a metal binder. Ceramics and superhard materials including diamond and cubic boron nitride may also be accepted provided the subject material is presented as hard materials as defined above.