| 摘要 |
PCT No. PCT/EP89/01049 Sec. 371 Date Mar. 11, 1991 Sec. 102(e) Date Mar. 11, 1991 PCT Filed Sep. 11, 1989 PCT Pub. No. WO90/02704 PCT Pub. Date Mar. 22, 1990.A boron nitride, of amorphous structure, which can scratch diamond, is produced from hexagonal or turbostratic boron nitride as starting material. In the process for the production of the amorphous boron nitride, the starting material is subjected to pressures above 70 Kbar and temperatures of at least 1650 DEG C. for a period sufficient for the starting material to be completely melted, followed by quenching the resulting boron nitride melt and thereafter forming grains of amorphous boron nitride. The amorphous structure of the boron nitride is determined by X-ray and electron beam investigation. |
