Thermal expansion of CaAl4O7-based refractory compositions containing MgO and CaO additions

被引：22

作者：

Jonas, S.

Nadachowski, F.

Szwagierczak, D.

Wojcik, G.

机构：

[1] AGH Univ Sci & Technol, PL-30059 Krakow, Poland

[2] Inst Electr Mat Technol, Cracow Div, Krakow, Poland

[3] Wroclaw Univ Technol, PL-50370 Wroclaw, Poland

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2006年 / 26卷 / 12期

关键词：

refractories; thermal expansions; CaAl4O7;

D O I：

10.1016/j.jeurceramsoc.2005.04.005

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：

Various compositions of recently developed CaAl4O7-based ceramics are mentioned with special reference to those called "nonexpansive refractories" (=NER). The observed effect of deep depression of their thermal expansion is mainly ascribed to the creation of a specific microstructure resulting from high temperature reactions of CaAl4O7 with MgO or CaO additives yielding a CaAl2O4-based liquid. Some details characterizing the phase composition of the reaction zone are given. The effect of the calculated approximate content of CaAl2O4 in the specimens is interpreted graphically. Basing on the results of changes in the CaAl4O7 single crystal dimensions presented in comparison with some other expansion data, the presumable nature of the specific behavior of NER bodies on heating up to 500 degrees C is discussed. The NER products fired at 1620 degrees C are characterized by high strength and low open porosity. (c) 2005 Elsevier Ltd. All rights reserved.

引用

页码：2273 / 2278

页数：6

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