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Novel superhard nanopolycrystalline materials synthesized by direct conversion sintering under high pressure and high temperature

Published online by Cambridge University Press:  10 October 2017

Hitoshi Sumiya
Hitoshi Sumiya*
Affiliation:
Advanced Materials Laboratory, Sumitomo Electric Industries, Ltd., Japan; sumiya@sei.co.jp
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Abstract

Single-phase (binderless) superhard nanopolycrystalline diamond and cubic boron nitride (cBN) consisting of fine grains of several tens of nanometers without any secondary phases or binder materials have been developed. These nanopolycrystalline materials are synthesized by direct conversion sintering under ultrahigh pressure and high temperature with optimized and precisely controlled starting materials and synthesis conditions. Their hardness surpasses that of single crystals and conventional sintered compacts and is free from the characteristic cleavage and anisotropy of single crystals. They are especially promising materials for next-generation high-precision, high-efficiency cutting tools and wear-resistant tools. The nanopolycrystalline diamond has excellent potential for precision cutting of nonferrous hard materials, including cemented carbide and hard ceramics, as does the nanopolycrystalline cBN for cutting ferrous hard metals.

Keywords

diamondgrain sizehardnessnanostructurepolycrystal
Type
Research Article
Information
MRS Bulletin , Volume 42 , Issue 10: Materials Under Pressure , October 2017 , pp. 729 - 733
Copyright
Copyright © Materials Research Society 2017 

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