表面を酸化したアルミニウム粉を原料とした窒化アルミニウムの作製

概要

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In nitriding of aluminum powders, several methods have been suggested for preventing the aggregation of melted particles of aluminum. In this study, the surface of aluminum particles was covered with hydroxide layers. Using the aluminum powders containing more than 1 wt% oxygen, the nitridation reaction was completed successfully at 900℃ for 2 h. However, the aluminum powders containing less than 1 wt% oxygen did not react with nitrogen, because of aggregation of aluminum particles. When the oxygen content in aluminum powder was 1 wt%, the highest conversion of 98.9% was obtained and the oxygen content in the product: AlN was 1.3 wt%. Since the nitriding proceeded rapidly at 900℃, the products sintered strongly by the heat of reaction. In order to decrease the nitriding rate, the nitrogen gas was diluted with argon gas. The product obtained by using diluted nitrogen gas was very easy to grind. The preferable concentration of nitrogen was 90%, considering the conversion and the grindability.
社団法人日本セラミックス協会の論文
1992-05-01