Thermodynamic Calculation of Thermo-insulated Temperature for Fe-Cr Matrix Wear Resistant Composites

Based on the heat balance, the thermo-insulated temperatures of Fe-Cr matrix wear resistant composites Al-Fe₃O₄-CrO₃-B₄C-Ti system with different mass ratios of Fe/Cr and contents of hard phase were calculated. The results show that m(Fe):m(Cr)=4:1-9:1, the thermo-insulated temperature of Al-Fe₃O₄-CrO₃-B₄C-Ti system are higher than 1 800 K with the hard phase content increasing from 10% to 40%, the combustion synthesis reaction can be self-sustaining. m(Fe):m(Cr)=7:1-9:1, as the mass ratio of Fe/Cr decreases, the thermo-insulated temperature of the reaction system does not increase much; m(Fe):m(Cr)<6:1, the thermo-insulated temperature of reaction system increases greatly. The correctness of theoretical calculation for the thermo-insulated temperature of the system was verified by the combustion synthesis experiment. Combined with the thermodynamic analysis and the result of combustion synthesis experiment, the best mass ratio of Fe/Cr and mass fraction of hard phase are 6:1 and 30% separately.