ゾルーゲル法による透明アルミナ焼結体 : (<小特集>粉体小特集)
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概要
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Recent developments in ceramic fabrication processes enable one to produce transparent and translucent polycrystalline ceramics. These ceramics are fully densified and have near zero porosity in order to eliminate the dispersion of light and internal reflection due to heterogeneities of their texture. This is achieved by sintering a well prepared raw material under carefully controlled atmos-phere, temperature and time schedule. In the present study, transparent aiumina was prepared by a sol-gel method. The fabfication process comprises the four stages of precipitation of aluminum monohydroxide, formation of the sol, formation of the gel, and fring to alumina. The thin plate of gel was formed by very slow dehydration of an aqueous sol at ambient pressure and temperature. and then it was heated in air to obtaine a transparent alumir,a. The resultant alumina was transparent up to 1000℃, above which it was opalized gradually with temperature accompanying the formation of α-alumina phase. The following sequence of transition was identified by the X-ray powder diffraction; Boehmite gel-δ-alumina θ-alumina α-alumina
- 社団法人日本材料学会の論文
- 1977-09-15