氮化温度对MgO-C耐火材料结构和性能的影响

doi:10.11896/cldb.19110186

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Abstract In order to optimize the performance of MgO-C refractories, the fused magnesia, flake graphite and silicon powder-loaded ferric nitrate were used as the raw materials, and the thermosetting phenolic resin was used as the binder to prepare MgO-C refractories by high temperature nitriding. The effects of the addition of catalysts and different nitriding temperatures on the structure and properties of MgO-C refractories were investigated. The results show that when the nitriding temperature was 1 200 ℃, the addition of catalyst could promote the generation of α-Si₃N₄, SiC and Mg₂SiO₄, and significantly improved the mechanical strength of the material compared with the sample without catalyst. The α-Si₃N₄ formed in the sample with 1% catalyst showed granular and whisker-like morphologies, which were interwoven. Mg₂SiO₄ existed in a blocky morphology. As the nitriding temperature increased to 1 300 ℃, a small amount of acicular Mg₂SiO₄ was formed, and the blocky Mg₂SiO₄ grains grew. At this time, the material exhibited good mechanical strength, and the cold modulus of rupture and cold crushing strength were 10.82 MPa and 55.17 MPa, respectively.

Key words： MgO-C refractories catalyst nitriding temperature phase composition microstructure

Published: 01 July 2021

CLC number:

TQ175

Fund:National Natural Science Foundation of China (51574187, 51502215, 51602232), Natural Science Foundation of Hubei Province (2018CFA022).

About author:: Xing Wang is currently pursuing her Ph.D. at the State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology. Her research has focused on carbon containing refractory.
Jun Ding is currently a associate professor and master's supervisor in Wuhan University of Science and Techno-logy. He was selected as a Young Scholar of Chutian Scholars Program in Hubei Province. He mainly focuses on the design and preparation of refractories, high-value and efficient utilization of refractory materials and characterization of material properties. He has presided over and participated in more than 10 projects such as the National Key Technology Research and Development Program, the pre-973 Program, the National Natural Science Foundation. In addition, he has published more than 60 academic articles as the first or corresponding author, among which 35 papers have been indexed by SCI. He authorized 10 national invention patents as the first completion person, cooperated in the formulation of 1 industry standard, and won 4 scientific research awards at the provincial and ministerial level.

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	WANG Xing
	CHEN Yang
	CAO Guilian
	DENG Chengji
	DING Jun
	YU Chao
	ZHU Hongxi

Cite this article:

WANG Xing,CHEN Yang,CAO Guilian, et al. Effect of Nitriding Temperature on Structure and Properties of MgO-C Refractories[J]. Materials Reports, 2021, 35(12): 12053-12056.

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http://www.mater-rep.com/EN/10.11896/cldb.19110186 OR http://www.mater-rep.com/EN/Y2021/V35/I12/12053

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