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

LIU Jin; HE Duanwei

doi:10.13394/j.cnki.jgszz.2018.6.0001

Volume 38 Issue 6

Dec. 2018

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LIU Jin, HE Duanwei. Sintering super-strong micro-grained polycrystallinediamond compacts under ultrahigh pressure[J]. Diamond & Abrasives Engineering, 2018, 38(6): 1-6. doi: 10.13394/j.cnki.jgszz.2018.6.0001

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LIU Jin, HE Duanwei. Sintering super-strong micro-grained polycrystallinediamond compacts under ultrahigh pressure[J]. Diamond & Abrasives Engineering, 2018, 38(6): 1-6. doi: 10.13394/j.cnki.jgszz.2018.6.0001

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

doi: 10.13394/j.cnki.jgszz.2018.6.0001

LIU Jin^1,2,
HE Duanwei^{1
,
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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

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Rev Recd Date: 2018-10-01

Available Online: 2022-07-10

Abstract

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