Abstract
Transparent polycrystalline YAG ceramics were fabricated by solid-state reactive sintering of a mixture of commercial α-Al2O3 and Y2O3 powders with tetraethoxysilane (TEOS) and MgO as sintering aids. Pressed samples were sintered from 1500°C to 1750°C in vacuum. Phase transformation, densification, microstructure evolution, grain growth kinetics and optical transparency of YAG ceramics were examined. Fully dense YAG transparent ceramic with average grain size about 17μm was obtained by vacuum sintering at 1730°C for 10h and the in-line transmittance of the sample was 80.9% at 1064nm wavelength. The maximal transmission 82.8% was demonstrated for the sample sintered at 1730°C for 20h, whose average grain size was about 22μm. These pure YAG ceramics can be used for optical windows applications.
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