Effect of Lanthanum Modification on Thermal Stability of γ-Al_2O_3 Layers Fabricated by Suspension-dip Process
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概要
- 論文の詳細を見る
The forming and thermal stability of a coat layer was investigated through a simple suspension-dipping procedure of aqueous La-modified γ-Al<SUB>2</SUB>O<SUB>3</SUB> suspension. The effect of La on the stabilization of surface area for powder, and the morphology of coat layers, which are heated at elevated temperatures, were examined by X-ray diffraction, nitrogen adsorption and scanning electron microscopy. The La-addition stabilized the metastable phases of Al<SUB>2</SUB>O<SUB>3</SUB> at temperatures up to 1200C, and induced the increase of phase-transformation temperature to α-Al<SUB>2</SUB>O<SUB>3</SUB>. The surface area of pure Al<SUB>2</SUB>O<SUB>3</SUB> layer decreased after heat treatment at 900-1200°C. Several factors for controlling the formation of a coat layer from La-modified γ-Al<SUB>2</SUB>O<SUB>3</SUB> suspension were discussed. A fabricated La-modified alumina layer was stable to realize high surface area as well as homogeneous shape without large cracks after heat treatment under heating condition at 1100°C in air.
- 社団法人 粉体粉末冶金協会の論文
- 2004-02-15
著者
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Ozawa Masakuni
Ceramics Res. Lab. Nagoya Inst. Of Technol.
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Ozawa M
Ceramics Research Laboratory Nagoya Institute Of Technology
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