目的 以Ti/Nb/Mo作为焊接中间层,采用真空扩散焊技术对ZrC-SiC/FeCrAl异种材料进行焊接。探究焊接工艺参数对接头界面微观组织演变及力学性能的影响。方法 利用扫描电子显微镜、能谱仪、电子万能试验机和显微压痕仪研究以Ti/Nb/Mo为焊接中间层时ZrC-SiC陶瓷与FeCrAl合金扩散焊的效果,分析不同焊接温度下ZrC-SiC/FeCrAl接头的界面结构、元素分布、力学性能及断口形貌。结果 在ZrC-SiC/Ti界面处,通过Ti与ZrC-SiC反应生成TiCx、(Ti,Zr)3Si等相,形成牢固的陶瓷侧界面;在Ti/Nb界面与Nb/Mo界面处,因元素互扩散形成均匀固溶体,其中Nb层可利用自身塑性变形有效释放接头残余应力;在Mo/FeCrAl界面处,则借助Mo与FeCrAl反应生成(Mo,Fe,Cr)ss和μ-(Fe,Cr,Al)7Mo6反应层,构筑了可靠的金属侧界面。Ti/Nb/Mo复合中间层设计能够有效缓解接头残余应力,提升接头连接强度,接头抗剪切强度可达90 MPa。随着焊接温度的升高,接头剪切断口位置由Nb/Mo层间逐渐转移至靠近Ti层的ZrC-SiC陶瓷内部,断裂模式由韧性断裂转变为脆性断裂。结论 基于扩散焊技术,Ti/Nb/Mo中间层能够通过高效的冶金反应实现ZrC-SiC陶瓷与FeCrAl合金的可靠连接,且焊接温度对接头界面形貌和力学性能有显著影响。
Abstract
The work aims to bond the dissimilar materials ZrC-SiC/FeCrAl by vacuum diffusion bonding with Ti/Nb/Mo as the interlayer and explore the effects of bonding process parameters on the interfacial microstructure evolution and mechanical properties of the joints. The diffusion bonding effects of ZrC-SiC ceramic and FeCrAl alloy with Ti/Nb/Mo as the interlayer were studied by scanning electron microscopy, energy dispersive spectroscopy, electronic universal testing machine and indentation tester. The interfacial structure, element distribution, mechanical properties and fracture morphology of ZrC-SiC/FeCrAl joints at different welding temperatures were analyzed. At the ZrC-SiC/Ti interface, Ti reacted with ZrC-SiC to form phases such as TiCx and (Ti,Zr)3Si, creating a robust ceramic-side interface. At the Ti/Nb and Nb/Mo interfaces, uniform solid solutions were formed due to interdiffusion of elements, and the Nb layer could relieve residual stress in the joint through its own plastic deformation. At the Mo/FeCrAl interface, the reaction between Mo and FeCrAl generated (Mo,Fe,Cr)ss and μ-(Fe,Cr,Al)7Mo6 reaction layers, constructing a reliable metal-side interface. The Ti/Nb/Mo interlayer design effectively relieved residual stress in the joint, achieving a shear strength of up to 90 MPa. With the increasing bonding temperature, the location of shear fracture gradually shifted from the Nb/Mo interface to the ZrC-SiC ceramic near the Ti layer, and the fracture mode changed from ductile fracture to brittle fracture. Based on the diffusion bonding technology, Ti/Nb/Mo interlayer enables the reliable joining of ZrC-SiC ceramic and FeCrAl alloy through efficient metallurgical reactions. Besides, the interfacial morphology and mechanical properties of the joint are affected significantly by the welding temperature.
关键词
ZrC-SiC陶瓷 /
FeCrAl合金 /
扩散连接 /
Ti/Nb/Mo中间层 /
界面组织 /
力学性能
Key words
ZrC-SiC ceramic /
FeCrAl alloy /
diffusion bonding /
Ti/Nb/Mo interlayer /
interfacial microstructure /
mechanical properties
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基金
国家自然科学基金（52475419,52505453）; 中国博士后基金面上项目（2024M763744）
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