Effects of Silicon Powder and Graphite Additions on Properties of Magnesia Composites Prepared from Magnesite Tailings

doi:10.19691/j.cnki.1004-4493.2025.04.008

China's Refractories ›› 2025, Vol. 34 ›› Issue (4): 36-41.DOI: 10.19691/j.cnki.1004-4493.2025.04.008

Effects of Silicon Powder and Graphite Additions on Properties of Magnesia Composites Prepared from Magnesite Tailings

YUE Jingjing¹, ZHAO Xin¹, YOU Jiegang^1,*, ZHANG Ling¹, ZHANG Xiaofang¹, FENG Dong¹, LUO Shitong², DUAN Mingjun¹, ZHANG Yi³

1 School of Materials and Metallurgy, University of Science and Technology Liaoning, Anshan 114051, China;
2 Haicheng City Fengchi Refractory Materials Limited Company, Haicheng 114200, China;
3 School of Electronic and Information Engineering, University of Science and Technology Liaoning, Anshan 114051, China

Online:2025-12-15 Published:2026-01-04
Contact: *e-mail: youjiegang@163.com
About author:Yue Jingjing, born in 2000, graduated from University of Science and Technology Liaoning with a master’s degree in material and chemical engineering in 2025. She mainly engages in the development and utilization of high-temperature ceramics and industrial solid wastes.

Abstract

Abstract: To improve the utilization rate and application value of magnesite tailings, magnesia composites were prepared using light-calcined magnesite tailing powder as the raw material, silicon powder, and 95-graphite as additives, and phenolic resin as the binder by the solid-phase reaction pressureless sintering method. The effects of Si powder and graphite powder additions on the cold modulus of rupture, density, linear change rate, thermal shock resistance, microstructure, and phase composition of the composites were investigated in a carbon embedded atmosphere. The results show that with increasing additions of silicon powder and graphite powder, the forsterite and silicon carbide contents in the materials increase, finally forming an M₂S-SiC-C multiphase material with M₂S as the main crystal phase. The carbon monoxide and silicon monoxide gases produced during the reaction are detrimental to the sintering of the material, resulting in the decrease of the cold modulus of rupture, bulk density, and linear shrinkage, and the increase of the porosity. After thermal shock, the strength retention ratio of the materials increases significantly compared with that of the sample without additives, because both the increased forsterite content and the generation of silicon carbide whiskers in the materials contribute to improving the thermal shock resistance.

Key words: magnesite tailings, magnesia composites, silicon carbide, thermal shock resistance

YUE Jingjing, ZHAO Xin, YOU Jiegang, ZHANG Ling, ZHANG Xiaofang, FENG Dong, LUO Shitong, DUAN Mingjun, ZHANG Yi. Effects of Silicon Powder and Graphite Additions on Properties of Magnesia Composites Prepared from Magnesite Tailings[J]. China's Refractories, 2025, 34(4): 36-41.

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Effects of Silicon Powder and Graphite Additions on Properties of Magnesia Composites Prepared from Magnesite Tailings

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