Fabrication and properties of mullite fiber matrix porous ceramics by a TBA-based gel-casting process
Fabrication and properties of mullite fiber matrix porous ceramics by a TBA-based gel-casting process
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基于TBA的凝胶注模工艺制备莫来石纤维基多孔陶瓷及其性能
DOI：
10.1016/j.jeurceramsoc.2012.10.011
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发表时间：
2013-04-01
影响因子：
5.7
通讯作者：
Liu, Mengxia
中科院分区：
文献类型：
--
作者：
Hou, Zhenguang;Du, Haiyan;Liu, Mengxia
以莫来石纤维为基体，SiO2为高温粘结剂，设计了鸟巢状结构。这种特殊材料是通过基于TBA的凝胶注模工艺成功制备的。由SiO2粘结剂粘结的随机排列的纤维搭接是这种多孔材料最重要的结构特征。研究了烧结温度对材料的气孔率、体积密度、线收缩率、抗压强度、导热系数和显微结构的影响。复合材料表现出明显的假塑性。讨论了该复合材料的压缩断裂机理。结果表明，在1500 ~ 1600 ℃的烧结温度范围内，制备的莫来石纤维基多孔陶瓷具有较低的热导率（0.19- 0.22W/mK）、较高的抗压强度（3-13 MPa）和较高的回弹率（66-70%），可用于绝热材料和高温弹性密封材料。(C)2012爱思唯尔有限公司保留所有权利。
A bird nest-like structure was designed by using the mullite fiber as the matrix and SiO2 as the high temperature binder. This special material was successfully prepared by a TBA-based gel-casting process. The randomly arranged fiber laps bonded by SiO2 binder was the most important structure characteristic of this porous material. The effect of sintering temperature on the properties, i.e. porosity, bulk density, linear shrinkage, compressive strength, thermal conductivity and the microstructure was studied. The composite exhibited significant pseudoductility. The fracture mechanism of this composite under compression was discussed. The results indicated that the sintering temperature ranging from 1500 to 1600 degrees C was suitable for yielding mullite fiber matrix porous ceramics which had a low thermal conductivity (0.19-0.22 W/m K), a relatively high compressive strength (3-13 MPa) and a high resilience (66-70%) for applications in the thermal insulators and high-temperature elastic seal field. (C) 2012 Elsevier Ltd. All rights reserved.