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《Acta Materiae Compositae Sinica》 2017-01
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High temperature oxidation behavior of microwave sintering TiC/Ti6Al4V composites

WU Xiaohong;LUO Junming;HUANG Jun;XU Jilin;School of Material Science and Engineering,Nanchang HangKong University;  
TiC/Ti6Al4 Vcomposites were fabricated by microwave sintering.The isothermal oxidation behaviors of the TiC/Ti6Al4 Vcomposites were investigated in air under the temperature of 550,650 and 750℃.Moreover,the surface and cross-sectional morphologies and phase composition of the oxidation film were investigated.The results show that the TiC/Ti6Al4 Vcomposites are composed of TiC,α-Ti+β-Ti phases.With increase of the oxidation temperature,the oxidation rule curves change from parabola into line.The oxidation products of the composites mainly consist of TiO_2 as the oxidation temperature lower than 650℃.While the oxidation temperature is high up to750 ℃,the oxidation coatings are composed of three layers,containing thin outer TiO_2,intermediate Al_2O_3 and TiO_2 and inner TiO_2.With the TiC content increases,the oxygen activation energy increases,the particle size of oxide decreases and the oxidation resistance of TiC/Ti6Al4 Vcomposites improves.
【Key Words】: TiC/Ti6Al4Vcomposites microwave sintering high temperature oxidation oxidation kinetics
【Fund】: 江西省自然科学基金(20114BAB216014);; 江西省研究生创新专项资金(YC2015-S309)
【CateGory Index】: TB333
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