Effects of explosive shock treatment in the range of about 5 to 90GPa on the characteristics of TiO
2 and ZrO
2 powders were examined.
The explosive shock caused anatase-rutile transition of TiO
2 and caused the transition temperature to lower. This transition was found to enhance the sinterability of TiO
2 powders. The densification during the course of the transition was prohibited by the explosive shock treatment, and the density of sintered body of anatase TiO
2 for explosive shock became lower than that of the as-received powder. Explosively shocked rutile TiO
2 powder, on the other hand, showed higher sinterability than that of the as-received one probably because of smaller crystallite size and residual strain in the shock-treated powders.
The weight fraction of the tetragonal phase of ZrO
2 increased with the impacted pressure up to 20GPa but decreased at the pressure of 40 and 90GPa.
The crystallite sizee stimated from the X-ray diffraction profile of both powders became smaller with the increase in the impacted pressure. Auresidual strain of explosively shocked TiO
2 was present but was virtually absent in the ZrO
2 powder.
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