Mg還元テルミット法によるHfCの微粉末合成と生成過程

DOI 機関リポジトリ Web Site Web Site 被引用文献1件

書誌事項

タイトル別名
  • Preparation and Formation Processes of HfC Fine Powders by Mg-Thermite Method
  • Mg カンゲン テルミットホウ ニ ヨル HfC ノ ビフンマツ ゴウセイ ト

この論文をさがす

抄録

The preparation conditions and formation process of HfC fine powders from HfO2 by Mg-thermite method were examined under a CH4 flow. HfC fine powders of single phase were successfully prepared by heating powder mixtures of Mg and HfO2 with molar ratio of 4 and 5 at 800°-950°C for 1h in a 25-100vol% CH4 flow. The formation process of HfC powders was as follows: (1) HfO2+2Mg→α-Hf+2MgO, (2) 3CH4+2Mg→Mg2C3+6H2, (3) Mg2C3→2Mg+3C, (4) α-Hf+xC+y/2H2→HfCxHy and (5) HfCxHy+(1-x)C→HfC+y/2H2. Where, the above reactions took place above 650°C in parallel. It was found that hydrogen and carbon for HfCxHy were supplied by the reaction of CH4 with Mg and by thermal decomposition of Mg2C3, and carbon of HfC was also supplied by the thermal decomposition of Mg2C3. The supply of hydrogen and carbon continued according to a recycle of Mg (Mg→Mg2C3→Mg) which exists in the reaction system.

収録刊行物

被引用文献 (1)*注記

もっと見る

キーワード

詳細情報 詳細情報について

問題の指摘

ページトップへ