FIELD: inorganic compounds technology.
SUBSTANCE: cubic boron nitride employed in tool-making industry is prepared as follows. A blend is first prepared from hexagonal BN, cubic BN crystals, and a process-activating additive, for example Mg powder treated with iron sulfate heptahydrate solution, at ratio of hexagonal BN to addition 75:25, content of cubic BN 4.4 to 22.0%, and granularity 80/63. Blend is then exposed to high pressure and temperature in the region of thermodynamic stability of cubic BN.
EFFECT: increased yield of cubic boron nitride by 6-28% and increased content of crystals with a narrow granularity range (1-3 adjoining granularities) to 40-56%.
1 tbl, 7 ex
| Title | Year | Author | Number |
|---|---|---|---|
| CHARGE FOR MANUFACTURE OF THE CONTAINER OF THE HIGH-PRESSURE APPARATUS | 2003 |
|
RU2277074C2 |
| METHOD OF MANUFACTURE OF POLYCRYSTAL SUPERHARD MATERIAL | 2003 |
|
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| METHOD OF PRODUCING POLYCRYSTALLINE COMPOSITE MATERIAL | 2011 |
|
RU2525005C2 |
| METHOD OF PREPARING CUBICALLY STRUCTURED SUPERHARD MATERIALS | 1999 |
|
RU2159736C1 |
| SUPERHARD COMPOSITE MATERIAL | 1998 |
|
RU2134232C1 |
| CHARGE FOR PRODUCING MONOCRYSTALS OF CUBICAL BORON NITRIDE | 1991 |
|
RU2034642C1 |
| METHOD OF MAKING POLYCRYSTALLINE MATERIAL BASED ON CUBIC BORON NITRIDE CONTAINING DIAMONDS | 2011 |
|
RU2484888C1 |
| METHOD OF PRODUCING CUBIC BORON NITRIDE, HAVING LIGHT EMISSION | 2008 |
|
RU2394757C2 |
| METHOD OF PRODUCTION OF SUPERHARD ABRASIVE MEMBER | 1997 |
|
RU2157334C2 |
| ELEVATED-STRENGTH CUBIC BORON NITRIDE PREPARATION METHOD | 2002 |
|
RU2229434C2 |
