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Diamond and cubic boron nitride (CBN) are the two hardest materials known. They have found numerous applications in industry, both as ultrahard abrasives and as cutting tools. This article reviews the high-pressure synthesis and fabrication techniques of these materials. It discusses their wear resistance, tool geometries, and machining parameters. The article also explains their application as cutting tools in the field of machining.

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P.J. Heath, Ultrahard Tool Materials, Machining, Vol 16, ASM Handbook, ASM International, 1989, p 105–117,

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