作者：HIROYUKI SUNAYAMA;MASAYASU KAWAHARA;

作者单位：Department of Mechanical and Materials Science, Kumamoto University 2-39-1 Kurokami, Kumamoto-shi, Kumamoto-ken 860-8555

刊名：Journal of the Technical Association of Refractories

ISSN：0285-0028

出版年：2003-01-05

卷：23

期：3

起页：152

止页：155

分类号：TQ175

语种：英文

关键词：Magnesia-carbon brick;Rate of oxidation;Thermobalance;Topochemical reaction model;Effective diffusion coefficient;

内容简介

Accurate weight loss measurements for magnesia-carbon bricks were obtained continuously in air at 1273,1473 and 1673K with a thermobalance. The rate of oxidation was studied kinetically by application of a topochemical reaction model to the oxidation process. It was concluded that the oxidation process for MgO-C bricks in air was mainly controlled by the diffusion of O_2 through the porous decarburized layer. Furthermore, the effective diffusion coefficients through the pores in the decarburized layer were from 0.25 to 0.56 X 10~(-4) m~(-2) centre dot s~(-1) and the activation energy for the effective diffusion coefficient of O_2 was 36.9 J centre dot mol~(-1).