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Dynamic consolidation of cubic boron nitride and its admixtures

Tan, Hua and Ahrens, Thomas J. (1988) Dynamic consolidation of cubic boron nitride and its admixtures. Journal of Materials Research, 3 (5). pp. 1010-1020. ISSN 0884-2914. doi:10.1557/JMR.1988.1010.

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Cubic boron nitride (C–BN)' powders admixed with graphite-structured boron nitride powder (g-DN), silicon carbide whisker (SCW), or silicon nitride whisker (SNW) were shock compacted to pressures up to 22 GPa. Unlike previous work with diamond and graphite [D. K. Potter and T. J. Ahrens, J. Appl. Phys. 63, 910 (1987) it was found that the addition of g-BN inhibited dynamic consolidation. Good consolidation was achieved with a 4–8 μm particle size C–BN powder admixed with 15 wt.% SNW or 20 wt.% SCW whereas a 37–44 μm particle size C–BN mixture was only poorly consolidated. Scanning electron microscopy (SEM) analysis demonstrates that SCW and SNW in the mixtures were highly deformed and indicated melt textures. A skin heating model was used to describe the physics of consolidation. Model calculations are consistent with SEM analysis images that indicate plastic deformation of SCW and SNW. Micro-Vickers hardness values as high as 50 GPa were obtained for consolidated C–BN and SNW mixtures. This compares to 21 GPa for single-crystal Al_2O_3 and 120 GPa for diamond.

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Additional Information:Copyright © Materials Research Society 1988. (Received 22 February 1988; accepted 13 May 1988). We are grateful to General Electric Co. and Tateho Chemical Industries Co. for gifts of sample materials. We thank Steve Launspach for his assistance in SEM and x-ray diffraction analysis; E. Gelle for help in sample preparation; and Andrew Mutz for help in carrying out micro-Vickers hardness tests. Contribution No. 4583, Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125. Research performed under Caltech Program for Advanced Technologies supported by GTE, General Motors, TRW, and Aerojet-General.
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Caltech Program for Advanced TechnologiesUNSPECIFIED
Aerojet GeneralUNSPECIFIED
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Caltech Division of Geological and Planetary Sciences4583
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ID Code:51091
Deposited By: George Porter
Deposited On:31 Oct 2014 14:14
Last Modified:10 Nov 2021 19:05

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