Al_2O_3陶瓷/钢钎焊工艺  

Brazing process of alumina ceramic to steel

作　　者：张万红[1,2] 李宁[1] 

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471003 [2]河南省有色金属材料科学与加工技术重点实验室,河南洛阳471003

出　　处：《焊接学报》2010年第11期97-100,共4页Transactions of The China Welding Institution

基　　金：河南科技大学博士基金资助项目(09001232);河南科技大学科学研究基金资助项目(2008ZY004)

摘　　要：陶瓷与金属的连接广泛应用于航空航天、电子、仪器仪表、燃料电池等领域.采用活性钎料Cu70Ti30,Cu75Ti25,Cu80Ti20和Cu85Ti15对Al2O3陶瓷与Q235钢进行了真空钎焊.测量了各试样的抗弯强度和界面区的显微硬度.结果表明,Cu75Ti25是最佳钎料配比,钎焊温度1 100℃,保温时间20 min是最佳的钎焊工艺,该工艺下钎料充分熔化填充接头间隙并与陶瓷和钢侧相互扩散,形成由3层不同组织所构成的界面结合区,即液态钎料填充陶瓷微孔形成的反应层、Ti-Cu合金层以及钢侧扩散层;在界面结合区生成有AlCu4,Cu3TiO4,TiC,TiFe2等新相;界面结合区组织致密、无微孔等缺陷,实现了良好的冶金结合.Ceramics/metals joining is widely applied in aerospace and electronic industry,instruments,fuel cells fields.Al2O3 ceramic was brazed to Q235 steel in vacuum with active filler alloys Cu75Ti25,Cu70Ti30,Cu80Ti20 and Cu85Ti15,respectively.The bending strength of each specimen and the microhardness of the interface were tested,and the results showed that the Cu75Ti25 filler was the best ratio of filler metal,and the optimum brazing parameters were 1 100 ℃ and 20 minutes.At the optimized temperature,the active filler alloy melts sufficiently and fills joint gap,then mutually diffuse into ceramic and steel sides.The bonding interface is composed of three layers of reaction layer formed by microporous ceramics filled with liquid active alloy,Ti-Cu alloy layer and steel side diffused layer.XRD analysis shows that AlCu4,Cu3TiO4,TiC,TiFe2 phases form in the bonding zone,and the microstructure of bonding area is dense and there are no defects.Accordingly a good metallurgical combination of ceramic/steel is achieved.

关 键 词：活性钎焊 Cu75Ti25 AL2O3陶瓷 Q235钢 界面 

分 类 号：TG454[金属学及工艺—焊接]