China's Refractories


China's Refractories ›› 2024, Vol. 33 ›› Issue (1): 44-48.DOI: 10.19691/j.cnki.1004-4493.2024.01.009

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Aluminum and Activated Alumina Powder Additions on Microwave Synthesis of Al4SiC4

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

  1. Henan Key Laboratory of Green Building Materials Manufacturing and Intelligent Equipemnt, Luoyang Institute of Science and Technology, Luoyang 471023, China
  • Online:2024-03-15 Published:2024-04-07
  • Contact: *e-mail:
  • About author:Wang Li, born in 1968, received his doctor's degree in materials science from Xi'an University of Architecture and Technology in 2013. He serves as a member of Refractories Committee of The Chinese Society for Metals, a member of SAC/TC193 Technical Committee on Refractory of Standardization Administration of China, and a member of Luoyang Green Building Materials Expert Committee. He has presided over and participated in a number of provincial and ministerial level projects. He has published more than 50 papers in China and overseas scientific journals, among which more than 20 papers have been indexed by EI or SCI. He has applied for more than 30 patents and obtained 13 authorized invention patents. He mainly engages in the development and utilization of high-temperature ceramics and industrial solid wastes.

Abstract: 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.

Key words: aluminum powder, activated alumina powder, microwave synthesis, Al4SiC4, magnesia carbon bricks