Structural studies of ceramics based on detonation-wave-treated graphite-like boron nitride
- Inst. of Materials Science, Kiev (Ukraine)
The formation of a structure during pressureless sintering of graphite-like boron nitride (BN) powders pretreated in detonation waves was studied. The treated powders contained 10-12% wurtzite BN phase and 2-3% sphalerite phase. During sintering at just 1200{degrees}C a reverse transformation from dense BN phases to graphite-like phases and primary recrystallization of highly fragmented BN{sub g} occur as a result of the pretreatment. Accretive recrystallization of BN{sub g} begins at 1500{degrees}C and at T = 1700-1950{degrees}C platy grains with a size of 1-3 {mu}m are formed in the developed surface. At 1700{degrees}C the density of the specimens reach 0.95 of the theoretical value. The specimens produced at 1950{degrees}C have a higher compressive strength and radiation resistance than do those made without pretreatment.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 376971
- Journal Information:
- Powder Metallurgy and Metal Ceramics, Journal Name: Powder Metallurgy and Metal Ceramics Journal Issue: 5-6 Vol. 34; ISSN PMMCEF; ISSN 1068-1302
- Country of Publication:
- United States
- Language:
- English
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