Preparation of ZrC/Al2O3 Fine Composite Powders by Thermite Reaction (粉末製造技術<特集>)
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概要
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Preparation conditions and formation process of ZrC/Al<SUB>2</SUB>O<SUB>3</SUB> composite powders from the ZrO<SUB>2</SUB>-Al-carbon black or ZrO<SUB>2</SUB>-CH<SUB>4</SUB> system were examined. The ZrC/Al<SUB>2</SUB>O<SUB>3</SUB> fine composite powders were prepared from the former system by heating the powder mixture of ZrO<SUB>2</SUB>:Al:C molar ratio=3:4:3 at 950°-1000°C for 1h. The formation process of the ZrC/Al<SUB>2</SUB>O<SUB>3</SUB> Composite powders was composed of three main reactions: (i) the reduction of ZrO<SUB>2</SUB> With Al and the formation of Al<SUB>2</SUB>O<SUB>3</SUB>, (ii) the formation of Al<SUB>3</SUB>Zr With Zr and Al, and (iii) the decomposition of Al3Zr with carbon black and the formation of ZrC. The process (i) was interfered by the process (ii). Al<SUB>4</SUB>C<SUB>3</SUB> was not formed by the process (m). On the other hand, in case of the ZrO<SUB>2</SUB>-Al-CH<SUB>4</SUB> system, preparation of ZrC/Al<SUB>2</SUB>O<SUB>3</SUB> composite powder was difficult because of Al<SUB>2</SUB>C<SUB>3</SUB> and ZrC were formed by reaction between Al<SUB>3</SUB>Zr and CH<SUB>4</SUB>. For the preparation of the ZrC/Al<SUB>2</SUB>O<SUB>3</SUB> composite powder, it was most important to suppress the formation of Al<SUB>4</SUB>C<SUB>3</SUB> by controlling the reactivity between Al and carbon source.
- 社団法人 粉体粉末冶金協会の論文
著者
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Kobayashi Hidehiko
Faculty Of Engineering Yamanashi University
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MITAMURA Takashi
Faculty of Engineering, Saitama Institute of Technology
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Shimosaka Kenichi
Faculty of Engineering, Saitama University
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Kobayashi Hidehiko
Faculty of Engineering, Saitama University
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Mitamura Takashi
Faculty of Engineering, Saitama University
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