Mullite whiskers derived from kaolin

被引：82
|
作者：
Kim, B. M. [1 ]
Cho, Y. K. [1 ]
Yoon, S. Y. [1 ]
Stevens, R. [2 ]
Park, H. C. [1 ]
机构：
[1] Pusan Natl Univ, Dept Mat Sci & Engn, Pusan 609735, South Korea
[2] Univ Bath, Dept Mech Engn, Bath BA2 97AY, Avon, England
来源：
CERAMICS INTERNATIONAL | 2009年 / 35卷 / 02期
关键词：
Calcination; Whiskers; Mullite; Structural applications; MORPHOLOGY; CERAMICS;
D O I：
10.1016/j.ceramint.2008.01.017
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Short mullite whiskers prepared by firing compacts of kaolin and NH4Al(SO4)(2)center dot 12H(2)O powders, with a small addition (0.8, 1.5 wt%) of NaH2PO4 center dot 2H(2)O, in air 1300 and 1400 degrees C for 15 h have been characterized in terms of whisker morphology, composition and structure. Relatively uniform whisker shaped crystals grew within the silicate glass matrix. After chemically leaching the glass matrix with HF solution using a microwave heating source, the resulting whiskers were exposed as isolated crystals and exhibited an aspect ratio of > 17 (similar to 0.5 mu m in diameter). The mullite whiskers had a composition of 51.06 mol% Al2O3 and 48.94 mol% SiO2, with an orthorhombic crystallographic structure. (C) 2008 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
引用
收藏
页码：579 / 583
页数：5
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