Al_2O_3-TiC复合陶瓷与Q235钢扩散连接界面组织结构  

Microstructure of Al_2O_3-TiC composite ceramics and Q235 steel diffusion bonded interface

作　　者：黄万群[1,2] 李亚江[1] 王娟[1] 沈孝芹[1] 

机构地区：[1]山东大学材料液固结构演变与加工教育部重点实验室,济南250061 [2]中国石油大学(华东)机电工程学院,山东东营257061

出　　处：《焊接学报》2010年第8期101-104,共4页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(50874069);教育部高校博士点基金资助项目(200804220020)

摘　　要：采用Ti/Cu/Ti复合中间层通过液相扩散连接技术实现了Al2O3-TiC复合陶瓷与Q235低碳钢的扩散连接.采用扫描电镜、电子探针及X射线衍射等测试手段对Al2O3-TiC/Q235扩散连接接头的显微组织、断口形貌及相组成进行了分析.结果表明,Al2O3-TiC/Q235界面结合紧密,没有显微孔洞、裂纹及未连接区域;Al2O3-TiC/Q235界面附近有各种各样的新相生成,如TiO,Ti3Al,Cu2Ti4O及Cu3Ti3O,所生成的TiO相及复杂结构氧化物Cu3Ti3O和Cu2Ti4O都具有金属特性,对于促进Al2O3-TiC/Q235的可靠连接起到重要作用;接头抗剪强度达143MPa,断口表现为脆性断裂特征,Al2O3-TiC/Q235接头断在界面附近的Al2O3-TiC内.The diffusion bonding of Al2O3-TiC composite ceramics to Q235 low carbon steel by using Ti/Cu/Ti as multi-interlayer was carried out by liquid phase diffusion bonding technology. The microstructure, fracture morphology and phase constituents for Al2O3-TiC/Q235 diffusion bonded joint were studied with scanning electron microscope, electron probe microanalysis and X-ray diffraction. The test results indicate that the Al2O3-TiC composite ceramics tightly combines with Q235 low carbon steel, and the interface both on the Al2O3-TiC and Q235 side seems to be continuous, straight and free of the micro-voids, cracks and unbonded areas. The various new phases, such as TiO, Ti3Al, Cu2Ti4O and Cu3Ti3O, are formed near the interface of the Al2O3-TiC/Q235 joint. The formed TiO phase and the complex structure oxides of Cu2Ti4O and Cu3Ti3O have metallic characteristics, which are very important to promote reliable bonding of Al2O3-TiC with Q235. The shear strength of the joints reaches 143 MPa, the fracture reveals brittle features and the fracture of the Al2O3-TiC/Q235 joint occurs in Al2O3-TiC near the interface.

关 键 词：扩散连接 显微组织 抗剪强度 相组成 

分 类 号：TG456.9[金属学及工艺—焊接]