超硬高韧微米颗粒聚晶金刚石块材的超高压制备

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基金项目:

国家重点研发计划（2018YFA0305900）。

Sintering super-strong micro-grained polycrystallinediamond compacts under ultrahigh pressure

1. Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China;
2. School of Mechanical Engineering, Jingchu University of Technology, Jingmen 448000, Hubei, China

摘要: 以微米级金刚石微粉为初始材料，利用自主研发的二级6-8型超高压大腔体装置，不添加黏结剂，在15 GPa左右条件下制备了超硬、高韧的厘米级块体聚晶金刚石，聚晶块体由高压硬化所致的、具有纳米亚结构的微米级金刚石颗粒组成。该材料的维氏硬度与单晶金刚石的最高维氏硬度（~120 GPa）相当，断裂韧性（18.7 MPa·m^1/2）可媲美高性能硬质合金。
- 加工硬化 /
- 二级大腔体高压装置 /
- 纳米亚结构
Abstract: Using micro-grained diamond powder as starting material, centimeter-sized super-strong micro-grained polycrystalline diamond (MPD) compacts have been prepared under about 15 GPa with a lab-designed two-stage 6-8 type multi-anvil large volume high pressure apparatus. The polycrystalline bulk is composed of micron diamond particles with nano-substructure induced by work hardening under high pressure. The Vickers hardness of the MPD bulk can reach the top limit of the single crystal diamond (about 120 GPa). The fracture toughness of MPD sample is as high as 18.7 MPa·m^1/2, which is similar to that of high performance tungsten carbide material.
- work hardening /
- two-stage large volume high pressure apparatus /
- nano-substructure

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