Preparation of CrSi<sub>2</sub> Powders by Solid-State Reaction between Chromium and Silicon Powders with Addition of Chlorides

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  • MIYAMOTO Masaaki
    Department of Electrical Engineering, Faculty of Engineering, Kokushikan University
  • TAKAHASHI Satoshi
    Department of Electrical Engineering, Faculty of Engineering, Kokushikan University
  • OKADA Shigeru
    Department of Applied Chemistry, Faculty of Engineering, University of Kanagawa
  • KUDOU Kunio
    Department of Mechanical Engineering, Faculty of Engineering, University of Kanagawa

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  • 塩化物添加のもとでの金属クロムとケイ素粉末の固相反応によるCrSi<sub>2</sub>の合成
  • エンカブツ テンカ ノ モト デ ノ キンゾク クロム ト ケイソ フンマツ

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Abstract

CrSi2 powders were prepared by the solid-state reaction between chromium and silicon powders with 0.1-10.0 mass% chlorides at 650-900°C for 2h in an argon atmosphere, and the effect of addition of chlorides on the reaction temperature and particle size of the system was studied. When the atomic ratio Si/Cr in the starting materials was 2.0 in the presence of 5.0 mass% of KCl or 1.0 mass% of NaCl, the single phase of CrSi2 was obtained at 900°C, 400°C lower than without the additives. When the chloride was not added, the product formed at 1300°C exhibited particles with a grain size of about 30μm in diameter. When KCl or NaCl was added, the product formed at 900°C exhibited particles with a grain size of about 1μm in diameter. The lattice constants of the CrSi2 formed in the presence of chlorides were as follows: for 5 mass% KCl: a=0.4424 (2) nm, c=0.6360 (2) nm; for 1 mass% NaCl: a=0.4423 (2) nm, c=0.6359 (2) nm.

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