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利用微米尺度、无定形二氧化硅与氧化钙制备层间距d(002)为1.13 nm的托贝莫来石,研究了托贝莫来石高温煅烧过程中的结构变化和在725℃时的微结构变化规律。结果表明:725℃煅烧2 h后,部分托贝莫来石形成类单斜链状的硅灰石结构(结晶态)和脱羟基托贝莫来石(无定形态);这种无定型的亚稳状态结构的外貌和托贝莫来石的晶体外貌相似,都是针状、片状的晶体,和大量由片状与针状堆积形成的颗粒状结构;在725℃煅烧温度下,部分微米、亚微米尺度的托贝莫来石转变为单斜链状的硅灰石结构。
In this paper, we use the microscale, amorphous silica and calcium oxide to prepare the tobopyramite with a layer spacing d (002) of 1.13 nm. The structural changes during the high temperature calcination of the tobaberite and the micro Structure changes. The results show that part of the tobaco mullite forms monoclinic wollastonite structure (crystalline state) and dehydroxytomobebber mullite (amorphous state) after being calcined at 725 ℃ for 2 h. This amorphous The appearance of the metastable state structure is similar to that of the tumeric mullite, which are acicular and lamellar crystals, and a large number of granular structures formed by lamellar and acicular accumulation. At a calcination temperature of 725 ° C, part The micrometre and submicron scales of tobago mullite turn into a monoclinic wollastonite structure.