アルミニウム液相と結晶石英粒子の反応に及ぼすマグネシウムとカルシウムの影響

書誌事項

タイトル別名
  • Influence of Magnesium or Calcium on Reaction of Crystalline Quartz Particles in Molten Aluminum
  • アルミニウム エキソウ ト ケッショウ セキエイ リュウシ ノ ハンノウ ニ オヨボス マグネシウム ト カルシウム ノ エイキョウ

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抄録

  A thermite reaction begins when quartz particles are incorporated into molten aluminum (Al) : the quartz is reduced and the Al is oxidized simultaneously. Consequently, alumina particles are dispersed into the Al-Si alloy matrix to produce a composite slurry. This study investigates the influence of additional elements on the reaction based on the microstructural observation of reacted particles. Magnesium (Mg) and calcium (Ca) were prepared as additional elements ; they served as a wettability modifier to the Al melt. Addition of Mg and Ca promoted dispersion of quartz particles into the molten alloy. Furthermore, Mg addition up to 10 mass% activated reaction. The outer layers of the particles formed a spinel up to 10 mass% Mg addition. However, reaction was significantly suppressed at 20 mass% Mg addition. Such marked retardation of reaction was also observed upon addition of 1 mass% Ca. Addition of Ca or 20 mass% Mg formed dense layers at the surface of quartz particles. The layer formed in the Ca added alloy was identified as CaAl2O4 in X ray diffraction (XRD) analysis. Without addition of these elements, the Al as a reducing agent was supplied to the front of the reaction inside the particles through microchannels as a result of the volume shrinkage from quartz to alumina. Reaction retardation by addition of Mg or Ca occurs due to the change in the supply route of the reducing agent from the microchannels to solid diffusion in the dense reactant solid formed at the outer layer of particles.

収録刊行物

  • 鋳造工学

    鋳造工学 75 (11), 737-742, 2003

    公益社団法人 日本鋳造工学会

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