Compositions: ceramic – Ceramic compositions – Carbide or oxycarbide containing
Patent
1988-09-15
1989-09-05
Dixon, Jr., William R.
Compositions: ceramic
Ceramic compositions
Carbide or oxycarbide containing
501 95, 501 96, 501 97, C04B 3558, C04B 3556
Patent
active
048638811
ABSTRACT:
Cubic boron nitride (C--BN) powders admixed with silicon carbide whisker (SCW) or silicon nitride whisker (SKW) may be shock-compacted to pressures of about 17 to 24 GPa. Good consolidation is achieved with 4 to 8 .mu.m particle size C--BN powder admixed with about 15 wt % SNW or about 20 to 25 wt % SCW. The mixture (26) is placed in a ring (24) mounted on a capsule (22) and is shock-compacted with a flyer (10) accelerated by a propellant gun. A sapphire plate (28) prevents penetration of metal particles into the sample during shock processing. Scanning electron microscopy (SEM) analysis demonstrate that SCW and SNW in the mixtures is highly deformed and indicates melt textures. Micro Vickers hardness values as high as 50 GPa have been obtained for consolidated C--BN and SNW mixtures. This compares to 21 GPa for single crystal Al.sub.2 O.sub.3 and 120 GPa for diamond.
REFERENCES:
patent: 4443420 (1984-04-01), Sato
patent: 4539300 (1985-09-01), Coblenz
patent: 4543345 (1985-09-01), Wec
patent: 4650776 (1987-03-01), Cerceau et al.
patent: 4788166 (1988-11-01), Araki et al.
Ahrens Thomas J.
Tan Hua
California Institute of Technology
Dixon Jr. William R.
Group Karl
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