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首页> 外文期刊>Journal of Materials Research >Secondary mullite formation in kaolin-Al_2O_3 ceramics
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Secondary mullite formation in kaolin-Al_2O_3 ceramics

机译：高岭土Al_2O_3陶瓷中的二次莫来石形成

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摘要

Secondary mullite has been formed in 60 wt percent kaolin-40 wt percent Al_2O_3 ceramics by solution-precipitation in the glassy phase in contact with Al_2O_3 particle, showing a plate-like morphology, at temperatures above 1673 K. The lattice constant modification of secondary mullite has been determined: the lattice parameters of orthorhombic structure of a, b, and c axes decrease from 8.653, 8.770, and 3.167 A to 7.958, 8.064, and 2.926 A, respectively. The Al_2O_3 content in the secondary mullite crystals increases from 59.69 to 70.41 wt percent when the grain width increases from 15 to 40 nm. Both the formation of secondary mullite and its grain growth are intimately related to the presence of the glassy phase originated from impurity (K_2O) in the kaolin. Their locations as well as their chemical composition of mullite grains, Al_2O_3 grains, and glassy phase are provided by the meticulous experiments using high-resolution transmission electron microscopy, selected-area electron diffraction, and energy dispersive spectroscopy techniques.
机译：在高于1673 K的温度下，通过与Al_2O_3颗粒接触的玻璃态固溶沉淀，在60 wt％的高岭土40 wt％的Al_2O_3陶瓷中形成了二次莫来石。已确定：a，b和c轴的正交结构的晶格参数分别从8.653、8.770和3.167 A减小到7.958、8.064和2.926A。当晶粒宽度从15nm增加到40nm时，次级莫来石晶体中的Al_2O_3含量从59.69wt％增加到70.41wt％。二次莫来石的形成及其晶粒长大都与高岭土中杂质（K_2O）引起的玻璃相的存在密切相关。通过使用高分辨率透射电子显微镜，选择区域电子衍射和能量色散光谱技术进行的细致实验，提供了它们的位置以及莫来石晶粒，Al_2O_3晶粒和玻璃态的化学成分。

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