Mg還元テルミット法によるHfN微粉末の合成

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rights: 社団法人日本セラミックス協会rights: 本文データは学協会の許諾に基づきCiNiiから複製したものであるrelation: IsVersionOf: http://ci.nii.ac.jp/naid/110002290108/Preparation of HfN fine powders from mixtures of HfO_2 and Mg by the thermite method has been investigated by three different methods; (1) direct synthesis in a N_2 gas flow, (2) reduction of HfO_2 and subsequent nitridation of α-Hf, and (3) direct synthesis in a mixed N_2+Ar gas flow. The HfN fine powders of single phase were synthesized by the methods (2) and (3). In the former case, the powder mixture of Mg/HfO_2=6 or 7 (molar ratio) was heated at 1000℃ for 1h in N_2 after heating at 800℃ for 1h in Ar. In the latter case, the same powder mixture was heated at 1000℃ for 1h in a N_2-Ar flow containing 75 to 90 vol% nitrogen. On the other hand, the preparation of HfN fine powders of single phase by the method (1) was very difficult, because nitridation of Mg proceeded preferentially in the reduction-nitridation process. The particle size of HfN with the composition of HfN_<0.92> Prepared at 1000℃ for 1h was 50-300 nm.
社団法人日本セラミックス協会の論文
1992-11-01