置氢TC4钛合金与Al_2O_3陶瓷扩散连接工艺研究  

Research on Diffusion Bonding of Hydrogenated TC4 Alloy to Al_2O_3 Ceramic

作　　者：王义峰[1] 曹健[1] 宋晓国[1,2] 郑祖金[1] 冯吉才[1,2] 

机构地区：[1]哈尔滨工业大学先进焊接与连接国家重点实验室,黑龙江哈尔滨150001 [2]哈尔滨工业大学(威海)山东省特种焊接技术重点实验室,山东威海264209

出　　处：《稀有金属材料与工程》2013年第3期598-602,共5页Rare Metal Materials and Engineering

基　　金：国家自然科学基金项目(51275133);哈尔滨工业大学(威海)校科研基金(HIT(WH)201208)

摘　　要：采用直接扩散连接的方法实现了置氢TC4钛合金与Al2O3陶瓷的连接,利用光学显微镜、扫描电子显微镜、能谱分析以及X射线衍射等分析手段,确定了TC4/Al2O3扩散连接接头典型的界面结构为TC4/α-Ti/Ti3Al+Al2TiO5/Al2O3。研究了连接温度对TC4/Al2O3接头界面结构的影响规律,随着连接温度的升高各反应层厚度逐渐增加。基于反应动力学方程,计算了氢含量(质量分数)为0%、0.3%、0.4%时,Ti3Al+Al2TiO5层的反应激活能分别为213、172、152kJ/mol。当连接温度为840℃,连接时间为90min,氢含量为0.4%时,接头抗剪强度达到最大值为128MPa,断口分析表明断裂主要发生在Al2O3陶瓷母材侧。Direct diffusion bonding of hydrogenated TC4 alloy to Al2O3 ceramic was achieved.The typical interfacial microstructure of TC4/Al2O3 joint was TC4/α-Ti/Ti3Al＋Al2TiO5/Al2O3,which was confirmed by means of OM,SEM coupled with EDS and XRD.The effect of the bonding temperature on the microstructure of joints was investigated.Results show that the phase constitution of reaction layers dose not change when the bonding temperature is changed.However,with an increase of the diffusion temperature,the thickness of each reaction layer increases.The activation energy of Ti3Al＋Al2TiO5 layer are 213,172 and 152 kJ/mol,respectively when the hydrogen contents are 0 wt%,0.3 wt% and 0.4 wt%.The maximum shear strength of the joint reaches 128 MPa when the bonding temperature is 840 ℃ for 90 min and the hydrogen content in TC4 is 0.4 wt%.Moreover,fracture analysis shows that fracture occurs in the Al2O3 base metal side.

关 键 词：置氢 TC4钛合金 AL2O3陶瓷 扩散连接 界面结构 

分 类 号：TG454[金属学及工艺—焊接]