A study on the thermal stability of kilchoanite synthesized under hydrothermal conditions
作者： T. Dambrauskas , K. Baltakys , A. Eisinas , R. Siauciunas
DOI: 10.1007/S10973-016-5424-8
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摘要: The formation mechanism under hydrothermal conditions and the thermal stability of kilchoanite, when primary mixtures consisted CaO amorphous SiO2·nH2O, was examined in detail. synthesis has been carried out unstirred suspensions saturated steam pressure a 175–220 °C temperature range for 4, 8, 16, 24, 48 72 h by applying extra argon gas (10 bar). It determined that conditions, kilchoanite proceeded heavily because this compound produced at 190 °C after 48 h, 200 °C 24 h 210–220 °C 4–8 h. While synthesizing intermediary compounds, α-C2SH semi-crystalline C–S–H-type phases are always formed. In addition to this, it also proved synthetic is stable till 1120 °C higher recrystallized rankinite. both tribochemical activation have no influence on quartz sample structure. Meanwhile, amount total cumulative heat 60 h hydration equal only 7.97 J g−1. products calcination were characterized STA, XRD, SEM, FT-IR analyses BET method.
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