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通过非等温差示扫描量热分析和扫描电子显微镜,结合CuO-CaO系统相图,研究CuO在CaCO3和SiO2混合物中的掺量(质量分数)对硅酸三钙(C3S)矿物形成机理的影响。用X射线衍射分析了最终烧制试样的多晶型组成。结果表明:在C3S矿物形成的过程中,少量CuO的加入并没有显著地影响到CaCO3分解表观活化能。但是CuO的加入为C3S矿物的形成提供了液相,增加了液相量,液相的主要成分约80%为CuO。CuO的加入对C3S矿物的晶型产生了显著的影响。当试样中掺入0,1.0%,1.5%,2.0%CuO时,C3S多相体为T型;当试样中掺入0.5%CuO时,C3S多相体为R型;当试样中掺入3%CuO时,C3S多相体为M型。
The influence of the content (mass fraction) of CuO in the mixture of CaCO3 and SiO2 on the formation mechanism of tricalcium silicate (C3S) minerals was investigated by non-isothermal differential scanning calorimetry and scanning electron microscopy combined with the phase diagram of CuO-CaO system . The polymorphic composition of the final fired sample was analyzed by X-ray diffraction. The results showed that the addition of a small amount of CuO did not significantly affect the apparent activation energy of CaCO3 decomposition during the formation of C3S minerals. However, the addition of CuO provided a liquid phase for the formation of C3S minerals, increasing the liquid phase, with about 80% of the major component of the liquid phase being CuO. The addition of CuO has a significant effect on the crystalline form of C3S minerals. When 0,1.0%, 1.5% and 2.0% CuO were doped into the sample, the C3S polyphase was T-type. When 0.5% CuO was incorporated into the sample, the C3S polyphase was R-type. When 3% CuO is doped, the C3S multiphase is M type.