作者：YU Renhong1LIU Ping1LIU Pengcheng1CHEN Weihao1GAO Jianying2LI Jiwei3

作者單位：1. Henan University of Science and Technology 2. Imerys Aluminates(China) 3. Henan Higer High Temperature Materials Co.,Ltd.

刊名：China’s Refractories

ISSN：1004-4493

出版年：2018-12-15

卷：27

期：4

起頁：1-5

止頁：

分類號：TQ175.732

語種：英文

關鍵詞：

內容簡介

In order to clarify the effect of ultrafine spinel sources on slag resistance and microstructure of alumina-spinel castables,using tabular alumina and spinel as coarse aggregates, tabular alumina powders, spinel powders,calcium aluminate cement,spinel containing cement,spinel micro-powder and reactive alumina ultrafines as matrix,alumina-spinel castables used for RH snorkels were prepared by changing the particle size and sources of preformed spinel. The effects of different ultrafine spinel sources（ CMA72,spinel micro-powder） on the properties of alumina-spinel castables were investigated. Thermal shock resistance and slag resistance of specimens were compared by the residual strength rate（ 1 100 ℃,air cooling 1 cycle） and static crucible method. The microstructure and the slag corrosion resistance mechanism of the specimens were analyzed by SEM and EDS. The result shows that slag resistance of alumina-spinel castables can be improved by adding ultrafine preformed spinel,such as CMA72,and spinel micro-powder. The introduction of ultra-fine preformed spinel has little effect on HMOR of alumina-spinel castables,but has negative effect on TSR. ultra-fine and dispersive preformed spinel in the matrix and fine microstructure are the main reasons for the improvement of slag resistance of castables.