Abstract
A series of shock compaction experiments on SiC powder were carried out over a wide range of shock pressures and shock temperatures up to 30 GPa and 3400 K. Large changes in some physical properties and a variety of unique microstructures were observed in the shock-treated samples with changes in impact conditions. For an iron plate impactor, the optimum impact condition, which depends on the initial density, is 2.5 km sec−1 for 70% initial density and 2.0 km sec−1 for 50%. The best-sintered compact of SiC with 97% density and micro-Vicker's hardness of 2700 kg mm−2 was obtained under optimum conditions. Good compacts with high relative density and high strength exhibit the disruptive effects of the shock wave, which are indicated by microstrain increase and crystallite size reduction. The skin model is presented here in order to estimate the heterogeneous shock state which is realized under and after shock loading of the initial powder aggregates.
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Kondo, KI., Soga, S., Sawaoka, A. et al. Shock compaction of silicon carbide powder. J Mater Sci 20, 1033–1048 (1985). https://doi.org/10.1007/BF00585748
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DOI: https://doi.org/10.1007/BF00585748