摘要
采用电火花等离子烧结(SPS)制备Al_(2)O_(3)短纤维(含28%(体积分数)SiO_(2))增强Ti Al基复合材料。通过热力学和动力学分析,阐明界面反应机理。基体与Al_(2)O_(3)纤维的界面相为Ti_(5)Si_(3),该相主要来源于TiAl基体中的Ti元素和Al_(2)O_(3)纤维中的Si元素。TiAl基体与Al_(2)O_(3)纤维的界面反应激活能为285.1kJ/mol。此外,由于界面反应过程中Ti元素的消耗,界面周围的基体由γ-TiAl相组成。在热处理态Al_(2)O_(3)纤维和烧结态复合材料中,γ-Al_(2)O_(3)与非晶态SiO_(2)相发生化学反应,形成莫来石相。
Al_(2)O_(3)short fiber(containing 28 vol.%SiO_(2))reinforced TiAl matrix composite was prepared by spark plasma sintering(SPS).The interfacial reaction mechanism was clarified by thermodynamic and kinetic analyses.The main interfacial phase was Ti_(5)Si_(3),originated from Ti element of TiAl matrix and Si element of Al_(2)O_(3)fiber.The activation energy of interfacial layer was 285.1 kJ/mol.In addition,the matrix around the interfacial region was composed ofγ-TiAl phase due to the consumption of Ti element in the process of interfacial reaction.However,the formation of mullite phase occurred in the heat-treated Al_(2)O_(3)fiber and as-sintered composite due to the chemical reaction betweenγ-Al_(2)O_(3)and amorphous SiO_(2)phases.
作者
罗耀峰
陆锐宇
王岩
刘彬
阳海棠
刘咏
Yao-feng LUO;Rui-yu LU;Yan WANG;Bin LIU;Hai-tang YANG;Yong LIU(State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China)
基金
supported by the National Science and Technology Major Project of China(No.2019700160157)。
