Thermodynamics on Steel-bonded Cemented Carbide GT35 by in-situ Carbothermic Reduction Form Ilmenite
WU Yi, ZOU Zheng-guang, YIN Chuan-qiang, LI Xiao-min, ZHOU Lang
1. Key Laboratory of Nonferrous Materials & New Processing Technology of Ministry of Education, Guilin University of Technology, Guilin 541004, Guangxi, China; 2. School of Materials Science & Engineering, Nanchang University, Nanchang 330047, China
Abstract：Steel-bonded cemented carbide GT35 was fabricated by reaction sintering technology,using mineral ilmenite containing iron and titanium elements as the raw material.Synthesis and sintering were accomplished unanimously in the vacuum resistance furnace.A new way to synthesize the GT35 composite with relative low cost was practiced.The thermodynamics of the FeTiO3-C system was studied in detail through thermal analysis.The results showed that carbothermic reduction happened in the FeTiO3-C system,followed by the deoxidation of ilmenite step by step via a series of different valent titanium oxides to get TiC and iron solid solution as the ultimate phases.The experimental research confirmed that the interface bonding of GT35 was good and its structure was also compact.
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