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Preparation and Optimization of High-Purity Silicon Carbide Magnetic Abrasives for the Magnetic Induction-Wire Sawing Process

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Fluid Dynamics & Materials Processing 2020年第4期16卷 709-721页

作者： Wei Zhang Tengwei Qiu Chunyan Yao Precision Mold Processing and Intelligent Manufacturing Research Center Ningbo PolytechnicNingbo315800China Key Laboratory of Special Purpose Equipment and Advanced Processing Technology Ministry of EducationZhejiang University of TechnologyHangzhou310014China

In this study,magnetic abrasives were obtained by crushing and sieving sintered iron-silicon carbide(Fe-SiC)*** and SiC powders with different mesh numbers were pre-compacted using different pressures and then sintered at various temperatures and with different holding *** dispersion uniformity of the SiC powder was improved through surface modification using polyethylene glycol(PEG)*** resulting magnetic abrasives were characterized in terms of phase composition,density,relative permeability,and microstructure;this was followed by a comprehensive analysis to reveal the optimal processing *** ideal combination of process parameters for preparing SiC magnetic-abrasive grains for the magnetic induction-wire sawing process was obtained,which are preparation load of 60 kN,a SiC mesh number of 1,500,a sintering temperature of 1100℃,and a holding time of 4 h.

关键词： Wire sawing magnetic abrasives sintering phase compositions

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phase Composition Analysis of TiN-AI_2O_3Synthesized from Aluminum-containing Dross and Rutile by Aluminothermic Reductionnitridation Method

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China's Refractories 2014年第3期23卷 40-43页

作者： LIU Haitao MIN Xin JI Haipeng XU Youguo FANG Minghao LIU Yangai HUANG Zhaohui School of Materials Science and Technology China University of Geosciences(Beijing)

TiN- Al2O3 composite powder was prepared by aluminothermic reduction- nitridation method with starting materials of aluminum-containing dross and rutile,and metallic aluminum in the aluminum-containing dross as reducer. The influences of synthesis temperature（600-1 400 ℃） and aluminum-containing dross addition（20% lower than theoretical value,theoretical value,20% higher than theoretical value,and 50% higher than theoretical value） on phase compositions and microstructure of the composites were investigated,and the reaction mechanism was analyzed. The results show that（1） TiN- Al2O3 composite powder can be synthesized under the experimental conditions; the main phases are TiN,α-Al2O3,a little bytownite,and MgAl2O4;（2）enhancing synthesis temperature or increasing aluminumcontaining dross addition favors the reaction of aluminothermic reduction- nitridation;（3） in the synthesized products,α-Al2O3 is platy or columnar; TiN is sub-micron granular,which reinforces and toughens the composite.

关键词： aluminum-containing dross futile alumi-nothermic reduction - nitridation titanium nitride -alurnina composite powder phase compositions

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