Fabrication of c-BN Composites under Thermodynamically Metastable Condition of the c-BN by HIPing, UHPHIPing, and UHPHPing
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The sintering behavior of cubic boron nitride (c-BN) composites and c-BN / ceramic whisker composites under conditions in which the c-BN is thermodynamically metastable were studied by HIPing, and by ultrahigh pressure hot isostatic pressing (UHPHIPing), and by ultrahigh pressure hot pressing (UHPHPing). The c-BN fine particles (particle size: 0.5-2μm) coated with TiN by a physical vapor deposition (PVD) method, was used. A high-purity alumina (α-Al<SUB>2</SUB>O<SUB>3</SUB>) powder produced by the ammonium-aluminum carbonate thermal decomposition process were used as bonding materials with a very small amount of magnesia and titania, and 0, 30 and 40vol% SiC whiskers were also added. The obtained c-BN composites including relatively large amount of c-BN, or c-BN and SiC whiskers, were fully compacted without forming h-BN. Some of them showed very high hardness that ranked with c-BN cutting tools.
- The Review of High Pressure Science and Technology
The Review of High Pressure Science and Technology 7, 1001-1003, 1998
The Japan Society of High Pressure Science and Technology