SiC纤维增强Ti/Ti_2AlNb叠层复合材料制备及界面行为研究  

Fabrication and Interface Reaction of SiC Fiber Reinforced Ti/Ti_2AlNb Laminated Composite

作　　者：张国庆[1,2] 原梅妮 李殊霞[2] 侯红亮 曲海涛[2] 赵冰 Zhang Guoqing Yuan Meini Li Shuxia Hou Hongliang Qu Haitao Zhao Bing(College of Mechanical and Electrical Engineering, North University of China, Taiyuan 030051, China Beijing Aeronautical Manufacturing Technology Research Institute, Beijing 100024, China)

机构地区：[1]中北大学机电工程学院,山西太原030051 [2]北京航空制造工程研究所,北京100024

出　　处：《稀有金属》2017年第10期1093-1098,共6页Chinese Journal of Rare Metals

基　　金：航空科学基金项目(20145425004);国家自然科学基金项目(51201155);教育部博士点基金项目(20101420120006);山西省自然科学基金项目(2012011019-1;2012011007-1)资助

摘　　要：以SiC纤维、Ti箔、Ti_2AlNb箔为原材料,采用箔-纤维-箔方法,通过真空热压技术制备了SiCf/Ti/Ti_2AlNb叠层复合材料。利用扫描电子显微镜(SEM)、能谱分析仪(EDS)和X射线衍射仪(XRD)对复合材料相组成和微观组织进行了分析。结果表明,当真空热制造参数为920℃/40 MPa/30 min时,SiC纤维与韧性金属Ti实现良好冶金结合,界面反应产物主要为TiC,界面反应层厚度为0.8μm,C涂层厚度为1.3μm;韧性金属Ti层与金属间化合物Ti_2AlNb层通过Ti,Al,Nb 3种元素相互扩散方式形成固相扩散连接,界面平直,复合材料呈现出理想叠层结构。制备态的SiCf/Ti/Ti_2AlNb叠层复合材料主要由α-Ti,β-Ti,SiC,TiC,O相和B2相构成。在Ti与Ti_2AlNb固相扩散连接过程中,由于Al原子的扩散速率大于Nb原子,且Al是α稳定元素,Nb是β稳定元素,从而导致在Ti/Ti_2AlNb界面区域依次形成α+β双相组织和富B2相。在真空热压实验中,韧性金属Ti层与金属间化合物Ti_2AlNb层固相扩散连接过程依次为:物理接触/α+β双相区形成/富B2相区形成/富B2相区增厚。The SiCf/Ti/Ti2AlNb laminated composite was fabricated through vacuum hot pressing technology combined with foil-fiberfoil method by using raw materials SiC fibers,Ti foils and Ti2AlNb foils. The phase composition and microstructure of the laminated composites were analyzed by scanning electron microscopy（ SEM）,energy dispersive spectroscopy（ EDS） and X-ray diffraction（ XRD）. The experiment result indicated that SiC fiber and ductile metal Ti achieved perfect metallurgical bonding and the interface reaction product was mainly TiC,and the thickness of the interfacial reaction layer was 0. 8 μm,the thickness of C coating was 1. 3 μm when the parameter of vacuum hot pressing was 920 ℃/40 MPa/30 min. The ductile metal Ti layer and intermetallic Ti2AlNb layer formed a solid diffusion connection via mutual diffusion of Ti,Al and Nb. The interface of Ti/Ti2AlNb was straight and the composite had perfect laminated construction. The SiCf/Ti/Ti2AlNb laminated composite in preparation condition was mainly composed of α-Ti,β-Ti,SiC,TiC,O and B2 phases. In the process of Ti and Ti2AlNb solid diffusion connection,due to the diffusion rate of Al atoms was greater than Nb and Al was α stable element,Nb was β stable element,α-phase ＋ β-phase and B2-rich phases were formed successively in Ti/Ti2AlNb interface area. The orderly process of ductile metal Ti and intermetallic Ti2AlNb solid diffusion connection was： physical contacted,α-phase ＋ β-phase coexistence region formed,B2-rich phase region formed,B2-rich phase region thickened in the vacuum hot pressing.

关 键 词：SIC纤维 Ti2AlNb合金 叠层复合材料 箔-纤维-箔方法 微观组织 

分 类 号：TB333[一般工业技术—材料科学与工程]