| 摘要 |
PURPOSE:To produce easily a high-density sintered body having a hardened surface by subjecting the sintered body to an impregnation treatment to close the holes on the surface thereof then subjecting such body to a hot isotropic pressurization treatment. CONSTITUTION:A sintered body is subjected to an impregnation treatment to close the holes on the surface of the sintered body which communicate with the outdoor air and thereafter the sintered body is subjected to a hot isotropic pressurization treatment to crush and annihilate the holes existing therein by a pressure difference by which the porosity is decreased and the density is increased; at the same time the holes on the surface which are held closed are also crushed to harden the surface. The above-mentioned impregnation treatment and succeeding hot isotropic pressurization treatment are preferably executed plural times for sure closing of the holes on the surface. A ceramic slurry contg. at least one kind of Al2O3, SiO2 and Cr2O3 is preferably used as an impregnating material in the above-mentioned impregnating treatment to form the closed state of high hardness.
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