透明Y2O3の焼結に及ぼすBeOの影響
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The effects of BeO addition (0-2 wt%) on the pressureless sintering process and the transparency of yttria were studied. The addition of BeO (0.1-0.5 wt%) promoted the sintering of Y<SUB>2</SUB>O<SUB>3</SUB> to decrease markedly the residual pores in sintered bodies above 2100°C. The transparency of sintered Y<SUB>2</SUB>O<SUB>3</SUB> was independent of compacting pressure (1-10 t/cm<SUP>2</SUP>). BeO vaporized with the increase of sintering temperature and more than half of the initial contents of BeO decreased above 1800°C. The transmittance (thickness 1.0 mm, wavelength 300-7000 nm) of the 0.1 wt% BeO-Y<SUB>2</SUB>O<SUB>3</SUB> sintered at 2150-2250°C for 50-300 min. in H2 was 80%. It was suggested that the liquid phase formation of Y<SUB>2</SUB>O<SUB>3</SUB>-BeO system and the vaporization of BeO contributed to the fabricating of the transparent Y<SUB>2</SUB>O<SUB>3</SUB>.
- 社団法人 粉体粉末冶金協会の論文
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