3CaO・SiO_2の熱分解に及ぼす添加物の影響

概要

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The effect of the minor components added to 3CaO・SiO_2 on the thermal decomposition of 3CaO・SiO_2 has been studied by the methods of X-ray diffraction, differential thermal analysis and thermogravimetric analysis. The tricalcium silicate is prepared by heating the mixture of guaranteed reagents of calcium carbonate and silica, and also the guaranteed reagents used for the additives. The results obtained are summarized as follows; (1) the minor components, i.e., B_2O_3, Cr_2O_3, CoO, CuO, BaO, NaCl and CaF_2 accelerate the thermal decomposition of 3CaO・SiO_2 in the mixture of 3CaO・SiO_2 1 mol + the minor component 0.05 mol heated at 1200℃ for 5 or 10 hr, as shown in Table I. (2) The mixtures of 3Ca0_3・SiO_2 + additives, i.e., Cr_2O_3, MnO_2, NiO, CoO, ZnO and CuO are influenced by the heating atmosphere. (3) It seems that the ions of nearly the same size as Si^<4+> or having smaller size and larger ions than Ca^<2+> are possible to stabilize β or α' form of 2CaO・SiO_2 and accordingly these ions are effective for the thermal decomposition of 3CaO・SiO_2.
社団法人日本材料学会の論文
1965-01-15