作者：WANG Li,LIU Shijie,WEI Haoyu,MA Juanjuan,DONG Binbin,GENG Shangrui,YAN Miaoxin,QIN Feng,GUO Yusen

作者单位：Henan Key Laboratory of Green Building Materials Manufacturing and Intelligent Equipemnt, Luoyang Institute of Science and Technology

刊名：China's Refractories

ISSN：1004-4493

出版年：2024-03-15

卷：33

期：1

起页：44-48

止页：

分类号：TQ175.7

语种：中文

关键词：

内容简介

Aiming at improving the properties of magnesia carbon materials, silicon aluminum carbide（Al4SiC4） containing materials were prepared using industrial aluminum powder, silicon carbide powder, and graphite as raw materials, and activated alumina powder as an additive, mixing thoroughly, pressing into cylinders and then firing at 1 200 ℃ for 30 min in a carbon embedded atmosphere by the microwave method. The effects of the aluminum powder addition（20% and 24%, by mass） and activated alumina powder addition（0, 3%, 5% and 7%, by mass） on the microwave synthesis of Al4SiC4 as well as the effect of the obtained Al4SiC4 containing material on the properties of magnesia carbon bricks were studied. The results show that: compared with the samples with 20% aluminum powder, those with 24% aluminum powder generate more Al4SiC4. With the activated alumina powder addition increasing from 0 to 7%, the amount of Al4SiC4 generated increases first and then decreases. Compared with the sample without activated alumina powder, the samples with activated alumina powder show lower bulk density and higher apparent porosity. With the activated alumina powder addition increasing from 3% to 7%, the bulk density of the samples increases first and then decreases, while the apparent porosity of the samples shows an opposite trend. The optimal additions are 24% aluminum powder and 5% activated alumina powder, and Al4SiC4 synthesized in this sample has a hexagonal plate structure. With the synthesized Al4SiC4 containing material added, the magnesia carbon brick has slightly increased cold modulus of rupture, basically the same modulus of elasticity and improved oxidation resistance.