作者：YU Renhong1LIU Pengcheng1DONG Gaofeng2DONG Hongqin1

作者单位：1. High Temperature Materials Institute,Henan University of Science and Technology2. Yanshi City Guangming Hi-Tech Refractories Products Co.,Ltd.

刊名：China’s Refractories

ISSN：1004-4493

出版年：2017-12-15

卷：26

期：4

起页：1-6

止页：

分类号：TQ175.732

语种：英文

关键词：

内容简介

In order to clarify the effect of spherical light-weight aggregates addition on properties of Al2 O3-Si O2 system castables,adopting A70 mullite traditional light-weight aggregates and A70 mullite spherical light-weight aggregates,bauxite homogenization powder,microsilica,calcium aluminate cement as main raw materials,lightweight Al2 O3-Si O2 system castables were prepared by replacing conventional light-weight aggregate with spherical light-weight aggregates. The effects of spherical light-weight aggregates addition on workability,mechanical properties of castables after heated at different temperatures were researched; the microstructure of the aggregates was analyzed by SEM. The result shows that the introduction of spherical light-weight aggregates can significantly improve the flowability and reduce the water addition of the castables. Water demand of the castable is reduced from 18% with the conventional light-weight aggregates to 14% with spherical light-weight aggregates. In addition,light-weight castables prepared by spherical aggregates can keep the same workability within a wider range of water addition. Therefore,spherical aggregates are user-friendly. The introduction of spherical light-weight aggregates is favorable to packing density and mechanical properties of castables,such as cold crushing strength,cold modulus of rupture,hot modulus of rupture at1 200 ℃.