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Updated: Feb 9, 2026

Sample Preparation and Transfer Protocol for In-Vacuum Long-Wavelength Crystallography on Beamline I23 at Diamond Light Source
Published on: April 23, 2021
Note: Evaluation of microfracture strength of diamond materials using nano-polycrystalline diamond spherical indenter
H Sumiya1, K Hamaki1, K Harano1
1Advanced Materials Laboratory, Sumitomo Electric Industries, Ltd., Itami, Hyogo 664-0016, Japan.
Abstract:
Ultra-hard and high-strength spherical indenters with high precision and sphericity were successfully prepared from nanopolycrystalline diamond (NPD) synthesized by direct conversion sintering from graphite under high pressure and high temperature. It was shown that highly accurate and stable microfracture strength tests can be performed on various super-hard diamond materials by using the NPD spherical indenters. It was also verified that this technique enables quantitative evaluation of the strength characteristics of single crystal diamonds and NPDs which have been quite difficult to evaluate.
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