フォルステライトとシリカの固相反応によるエンスタタイトの生成速度と機構

概要

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The development of enstatite by solid state reaction in mixed powders of forsterite and SiO2 in various mole ratios at the temperature range 1150°-1350°C and for times up to 580 hrs is followed by quantitative X-ray measurements. Powders are used consisting of coarse (mostly 10μ) particles of one component in a fine-grained (mostly 1μ) matrix of the other component. Although the results are not precisely consistent with a diffusion-controlled mechanism, the rate of reaction is estimated to be about one-third (or even smaller) of that of MgO-SiO2 reaction.Studies, using mixed powder, indicate the development of enstatite on the forsterite side as well as on the SiO2 side, suggesting that one MgO of 2MgO⋅SiO2 reacts with SiO2. Mg is believed to be the main diffusing species.The results of firing in vacuum suggest that the reaction is possibly controlled by the diffusion of Mg ion through the enstatite.Putting all results obtained by our previous and present works together, the rate of reactions of the systems containing MgO and SiO2, i.e. MgO-SiO2, MgO-MgO⋅SiO2 and 2MgO⋅SiO2-SiO2, is conceivable to be controlled by the diffusion of Mg through the reaction product layer (s).
社団法人日本セラミックス協会の論文
1967-11-01