A STUDY ON THE CELITE PART (Part VI):THE SYSTEMS CaO-Al2O3-Fe2O3 and CaO-Al2O3-Fe2O3-SiO2, WHOSE MOLAR RATIOS OF
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In the system CaO-Al2O3-Fe2O3, if Al2O3/Fe2O3 molar ratio=1, the author reported in part II (This Journal, 1937, 45, 361) that in the each sample whose constitutional lime is more or less than that of 4CaO: Al2O3: Fe2O3, there must be a solid solution having a lower miscibility than 4CaO: Al2O3: Fe2O3, notwithstanding the increase or decrease of lime. In this report, in order to study more on the author's previous report (part II), the author has, by microscopic and X ray methods, examined the chemical products which exist in the fired mixtures of xCaO: Al2O3: Fe2O3 (x=3, 3.5, 4, 4.5, 5, 5.5, 6, 7, 10).The author has examined the final products in the samples which were made by sintering or fusing the five mixtures of 6CaO: Al2O3: Fe2O3+SiO2 (6, 9%) and 10CaO: Al2O3: Fe2O3+SiO2 (5, 10, 15%), for the purpose of knowing if the existence of free lime affect the final products.The experimental results are as follows:(1) In the fused samples, if Al2O3/Fe2O3 molar ratio=1, 4CaO: Al2O3: Fe2O3 is the solid solution having the maximum miscibility in the system CaO-Al2O3-Fe2O3. That is, when lime is more or less than 4CaO: Al2O3: Fe2O3, the miscibility of its solid solution decreases, notwithstanding the increase or decrease of lime. and makes a solid solution having a lower miscibility than 4CaO: Al2O3: Fe2O3. If lime is more than 4CaO: Al2O3: Fe2O3, it may be assumed to be a solid solution having a higher miscibility than 4CaO: Al2O3: Fe2O3, but the fact is reverse.This is probably because free lime reacts with Al2O3 in 4CaO: Al2O3: Fe2O3 and makes 3CaO⋅Al2O3, and a ferric oxide series compound becomes lower in miscibility than 4CaO: Al2O3: Fe2O3.(2) The sintered samples are a little different according to firing temperatures, but they have a same tendency.(3) There is no remarkable variations between a fired sample of a high lime mixture with SiO2 and the one without SiO2. In this case free lime seems to react with SiO2, and produce 3CaO⋅SiO2, 2CaO⋅SiO2, or CaO⋅SiO2 in accordance with the amount of SiO2.(4) Ferric oxide series compound in the special cement as celite cement of Al2O3/Fe2O3 molar ratio=1, seems to be a solid solution having a slightly lower miscibility than 4CaO: Al2O3: Fe2O3.
- 公益社団法人 日本セラミックス協会の論文
公益社団法人 日本セラミックス協会 | 論文
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