Compositions: ceramic – Ceramic compositions – Refractory
Patent
1997-11-26
2000-06-06
Langel, Wayne
Compositions: ceramic
Ceramic compositions
Refractory
423290, C01B 21064, C04B 3558
Patent
active
060718412
ABSTRACT:
A cubic boron nitride sintered body has sufficient strength, hardness, heat resistance and heat dissipativity for serving as a cutting tool. A method of preparing a cubic boron nitride sintered body involves preparing a low-pressure phase boron nitride as a starting material by reducing a compound containing boron and oxygen with a compound containing nitrogen and carbon. Then, the low-pressure phase boron nitride starting material is directly converted to a cubic boron nitride sintered body by subjecting the starting material to a high temperature and a high pressure. In the obtained cubic boron nitride sintered body, the ratio I.sub.220 /I.sub.111 of X-ray diffraction intensity I.sub.220 on the (220) plane relative to X-ray diffraction intensity I.sub.111 on the (111) plane is at least 0.1.
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Fasse W. F.
Fasse W. G.
Langel Wayne
Sumitomo Electric Industries Ltd.
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