Preparation of mullite whisker skeleton porous ceramic
Preparation of mullite whisker skeleton porous ceramic
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DOI：
10.1016/j.ceramint.2015.04.097
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发表时间：
2015-11
影响因子：
5.2
通讯作者：
Linfeng Xu;Xiuan Xi;Anze Shui;Wenli Zhu
中科院分区：
文献类型：
--
作者：
Linfeng Xu;Xiuan Xi;Anze Shui;Wenli Zhu
以高岭石和六氟铝酸铵（AHA）为原料，采用合适的烧成工艺制备了硅线石晶须骨架多孔陶瓷，然后在1400 °C下烧成制备了莫来石晶须和莫来石晶须。研究了烧成制度对硅线石晶须骨架形成的影响。高岭石与六氟铝酸铵（AHA）之间发生了一系列复杂的气相反应，导致陶瓷坯体中硅线石晶须骨架的形成。实验结果表明，快速一步烧成可形成六方片状α-Al 2 O3，慢速或两步烧成可完全形成晶须骨架结构。
Sillimanite whisker skeleton porous ceramic was firstly prepared by an appropriate firing process from kaolinite and ammonium hexafluoroaluminate (AHA) as raw materials, then mullite whisker and corundum were produced by firing the sillimanite whisker skeleton at 1400 °C. Effect of firing system on the sillimanite whisker skeleton formation was examined in detail. A series of complex gas phase reactions between the kaolinite and ammonium hexafluoroaluminate (AHA) caused the sillimanite whisker skeleton formation in the ceramic body. The experimental results show that one-step firing process with fast heating rate leads to the hexagonal shaped α-Al2O3platelet forming, but the slow heating rate or two-step firing processes can completely cause the whisker skeleton structure generation.