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论文类型：期刊论文

发表时间：2017-11-01

发表刊物：JOURNAL OF INORGANIC AND ORGANOMETALLIC POLYMERS AND MATERIALS

收录刊物：Scopus、SCIE、EI

卷号：27

期号：6

页面范围：1861-1869

ISSN号：1574-1443

关键字：Sr-bearing ye'elimite; Kinetics; Formation process; Rietveld quantitative phase analysis

摘要：Sr-bearing ye'elimite is synthetized through substitutions of Sr2+ ions for Ca2+ ions in ye'elimite (C(4)A(3)$). Here, we report formation process and the kinetic analysis of 3CaO center dot SrO center dot 3A(2)lO(3)center dot SO3 (C(3)A(3)$) which is a type of Sr-bearing ye'elimite. Clinkers of C(4)A(3)$ and C(3)A(3)$ were respectively sintered at different temperatures and prolong time, Rietveld quantitative phases analysis was conducted to quantify the clinkers. Specific to the isothermal process, different kinetic models were used for statistical fitting. Additionally, through fitting with Arrhenius equation, values of activation energy for both C(4)A(3)$ and C(3)A(3)$ were obtained and compared. The results show that formation of C(3)A(3)$ mainly derives from reaction between intermediate phases and sulfates. Overlapping temperature range for formation of both C(4)A(3)$ and C(3)A(3)$ is between 1150 and 1300 A degrees C, C(3)A(3)$ tends to be stable at 1350 A degrees C until 180 min. Formation mechanism of C(3)A(3)$ accords with three-dimensional diffusion, Jander model yields the highest correlation coefficients for both C(4)A(3)$ and C(3)A(3)$. Activation energy for formation of C(3)A(3)$ equals to 367.9 kJ/mol, which is higher than that of C(4)A(3)$ (300.8 kJ/mol). Sintering temperature mainly affects micro-morphology of C(3)A(3)$ particles, but has no influence on elemental distribution and compositions.