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首先通过固相反应合成了β Ca2SiO4,并在具有搅拌装置且自动产生蒸汽压的不锈钢 反应釜中,在高温混合法和低温混合法两种条件下进行了水化反应。反应温度从150℃到 400℃,反应时间从数小时到5天。XRD和SEM结果表明有7种不同的钙硅酸盐水合物(C S H)能在此不同的水热条件下形成,其中与前驱物β Ca2SiO4具有相同C/S摩尔比的化合物 是(硅酸二钙水合物(Ca2(SiO3OH)(OH))和羟硅钙石(Ca6(SiO4)(Si2O7)(OH)2),大于前驱 物中C/S摩尔比的化合物是佳羟硅钙石(Ca6(Si2O7)(OH)6)和莱粒硅钙石(Ca5(SiO4)2 (OH)2),小于前驱物中C/S摩尔比的化合物是钙硅酸盐(Ca8(SiO4)2(Si3O10))、斜方硅钙石 (Ca6(SiO4)(Si3O10))和变针硅钙石(Ca4(Si3O9)(OH))。作者讨论了不同水热条件对钙硅酸 盐水合物形成的影响、不同钙硅酸盐水合物的结构与形成条件之间的关系以及水合物的稳定 性和合成机理。
Firstly, β Ca2SiO4 was synthesized by solid-state reaction and hydration reaction was carried out in a stainless steel autoclave with a stirring device and automatic vapor pressure generation under the conditions of high-temperature mixing and low-temperature mixing. The reaction temperature is from 150 ° C to 400 ° C and the reaction time is from a few hours to 5 days. XRD and SEM results showed that seven different calcium silicate hydrates (CSH) could be formed under these different hydrothermal conditions. Among them, the compound with the same C / S molar ratio as the precursor β Ca2SiO4 was Calcium hydrate (Ca2 (SiO3OH) (OH)) and konite (Ca6 (SiO4) (Si2O7) (OH) 2), which are larger than the C / S molar ratio in the precursor, (Si2 O7) (OH) 6) and Laotite (Ca5 (SiO4) 2 (OH) 2), compounds that are smaller than the C / S molar ratio in the precursor are calcium silicate (Ca8 ), Orthorhombic (Si3O10), and calcite (Ca4 (Si3O9) (OH)). The authors discussed the effects of different hydrothermal conditions on the formation of calcium silicate hydrate , The relationship between the structure and formation conditions of different calcium silicate hydrates, and the hydrate stability and synthesis mechanism.