首页|Impurity formation mechanism of silicon carbide crystals smelted by Acheson process
Impurity formation mechanism of silicon carbide crystals smelted by Acheson process
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In order to further promote the application of SiC refractories in modern steel metallurgy,the occurrence forms and formation mechanism of impurities in SiC crystals smelted by Acheson process were investigated.The techniques of inductively coupled plasma-atomic emission spectrometry,X-ray diffraction,and scanning electron microscopy were combined to examine the types and occurrence forms of impurities in smelted SiC crystals.The results showed that the main impurities in the SiC are free Si,free C,oxides(CaO·Al2O3·2SiO2,3Al2O3·2SiO2,CaO·SiO2 and SiO2)and alloy phases(FexSiy,FexSiyTiz and FexAlySiz).The formation process of impurities during the smelting of SiC can be described as follows:At high temperature,the SiO2 and Fe,Ti related oxide impurities present in the raw materials are reduced to Si,Fe,and Ti metal melts.After the reduction process,the free Si,FexSiy and FexSiyTiz are precipitated from the melt during cooling.Free Si primarily exists in aggregated form within the SiC crystal,while the alloy phase is predominantly found at the interface between SiC and free Si,with FexSiyTiz embedded within FexSiy.Towards the end of the cooling process,other impurity oxides such as Al2O3,CaO,and some unreduced SiO2 solidify to form calcium-aluminum-silicate glass phases,predominantly located between SiC grains.The remaining C from the reaction is mainly dispersed as free C within the SiC crystal and at the interface between SiC and free Si.
Impurity elementFormation mechanismSmelted SiC crystalSiC refractoryOccurrence form
School of Materials and Metallurgy,University of Science and Technology Liaoning,Anshan 114051,Liaoning,China
Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education),Institute of Advanced Ceramics,School of Materials Science and Engineering,Northeastern University,Shenyang 110819,Liaoning,China
Liaoning Institute of Science and Technology,Benxi 117004,Liaoning,China
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