PROCEDE POUR LA PREPARATION DES POLYCRISTALES CUBIQUES DE NITRURE DE BORE

摘要

1392456 Polycrystalline cubic boron nitride FILIAL ORDENA LENINA INSTITUTA KHIMICHESKOI FIZIKI AKADEMII NAUK SSSR INSTITUT NOVYKH KHIMICHESKIKH PROBLEM AKADEMII NAUK SSSR INSTITUT FIZIKI VYSOKIKH DAVLENY AKADEMII NAUK SSSR GOSUDARSTVENNY ABRAZIVNY ZAVOD "ILICH" and TSENTRALNY NAUCHNO - ISSLEDOVATELSKY TEKHNOLOGICHESKY INSTITUT 13 July 1972 [19 July 1971] 32719/72 Heading C1A A powder containing dense modifications of boron nitride, part of which has been subjected to shock waves, is subjected to a pressure of at least 40 kbars and a temperature over 1200‹ C. to produce wear resistant polycrystalline cubic boron nitride. The "dense modifications" specified are those with a coordination number equal to 4 for both boron and nitrogen atoms, i.e. cubic densely packed BN and hexagonal densely packed wurtzite-like BN. The shock waves may be produced by explosion.