Hot dynamic consolidation of hard ceramics
- 66 Downloads
Diamond and cubic boron nitride powders were shock compacted at high temperature (873 and 973 K) by using a planar impact system at 1.2 and 2.0 km s−1. Silicon, graphite or a mixture of titanium and carbon powders were added to enhance the bonding of these superhard materials. Hot-consolidated specimens exhibited fewer surface cracks as compared with the specimens shock consolidated at room temperature. Diamond compacts having microhardness values over 55 GPa were obtained by subjecting porous mixtures of diamond crystals (4-8 μm) plus 15 wt% graphite (325 mesh) to an impact velocity of 1.2 km s−1 at 873 K. Well-consolidated c-BN samples, with microhardnesses (starting powders with 10–20 and 40–50 (μm) over 53 GPa were obtained.
KeywordsPolymer Silicon Titanium Graphite Boron
Unable to display preview. Download preview PDF.
- 7.“Proceedings of the First Workshop on Industrial Applications of Shock Processing of Powders”, CETR, New Mexico Institute of Mining and Technology, Socorro, NM, 1–3 June 1988, edited by M. A. Meyers and N. N. Thadhani.Google Scholar
- 8.“Proceedings of the Seminar on High Energy Rate Working of Rapidly Solidified Materials”, Novosibirsk, USSR, 10–14 October 1988.Google Scholar
- 9.A. Sawaoka (ed.), “Proceedings of the Second Workshop on Industrial Applications of Shock Processing of Materials”, Tokyo Institute of Technology, Japan, December 1988.Google Scholar
- 13.A. B. Sawaoka and T. Akashi, US Pat. 4 655 830(1987).Google Scholar
- 15.Y. Horie, in “Shock Compression of Condensed Matter — (1989)”, edited by S. C. Schmidt, J. N. Johnson and L. W. Davison (Elsevier Science, North-Holland, 1990) p. 479.Google Scholar
- 17.L. H. Yu and M. A. Meyers, private communication (1990).Google Scholar
- 18.K. Ichinose, M. Wakatsuki, T. Aoki and Y. Maeda, in “Proceedings of the 4th International Conference on High Pressure — 1974, Special Issue of the Review of Physical Chemistry of Japan”, edited by J. Osugi (Kawakita, Kyoto, 1975) p. 436.Google Scholar
- 22.D. Raybould, Int. Powder Metall. Powder Technol. 16 (1980) 9.Google Scholar