褐色アルミナ質研削材を空気中加熱したときのコランダム固溶Ti^<3+>の酸化析出速度

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概要

• 論文の詳細を見る

• Brown aluminous abrasive grains #36 to #120 in size, of corundum containing Ti3+, were heated at fixed temperatures between 1200° and 1400°C for various time periods and then the lattice spacing, d0·4·10 of corundum was measured. The following results were obtained.1) Differences in d0·4·10 between abrasive corundum and pure alumina corundum before heating were between 0.00048 and 0.00070Å.2) The relation between heating time, t, and exolution ratio of the titanium, X, could be approximately expressed by the following equation:X=1-6/π2∞Σn=1 1/n2exp(-n2π2Kt)where K is a constant depending on heating temperature and natures of abrasive grains.3) Linear relationship existed between log K and the reciprocal of heating temperature in °K. Apparent activation energies were between 92 and 117kcal/mol.4) Grain size dependency of the exolution rate was investigated by heating at 1350°C. K was approximately proportional to D-1.3. D is grain diameter.

• 社団法人日本セラミックス協会の論文
• 1970-10-01

著者

• 桑原 千三

  名古屋工業技術試験所

• 堀部 利泰

  名古屋工業技術試験所

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• 褐色アルミナ質研削材(Ti^固溶コランダム)を酸化加熱した場合にコランダム結晶中に析出する結晶相
• 酸化物独立薄膜の調製
• 褐色アルミナ質研削材を空気中加熱したときのコランダム固溶Ti^の酸化析出速度

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