Effect of holding time on microstructure and mechanical properties of ZrO2/TiAl joints brazed by Ag–Cu filler metal
Effect of holding time on microstructure and mechanical properties of ZrO2/TiAl joints brazed by Ag–Cu filler metal
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DOI：
10.1016/j.matdes.2015.08.020
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发表时间：
2015-12
影响因子：
8.4
通讯作者：
X. Dai;Jian Cao;Jiakun Liu;Shuai Su;Jicai Feng
中科院分区：
文献类型：
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作者：
X. Dai;Jian Cao;Jiakun Liu;Shuai Su;Jicai Feng
zro2陶瓷与TiAl合金的可靠连接对于发动机工业应用的成功至关重要。然而，对于zro2陶瓷与TiAl合金的接合问题，目前还没有系统的研究。在本研究中，使用活性AgCu填充金属实现了zro2陶瓷和TiAl合金的可靠钎焊。采用SEM、XRD和TEM对接头界面微观结构进行了表征。研究了保温时间对接头组织和力学性能的影响。结果表明，在zro2陶瓷附近形成cu3ti30 + TiO层，而在TiAl基板上形成AlCu2Ti层。随着保温时间的延长，cu3ti30o + TiO层厚度逐渐增加，AlCu2Ti颗粒逐渐变粗。采用纳米压痕法对反应相的硬度和杨氏模量进行了表征，揭示了材料的塑性变形能力。在880℃下钎焊10 min，抗剪强度达到48.4 MPa。
Reliable joining of ZrO2ceramic to TiAl alloy is crucial for the success of the engine industrial application. However, there have been few systematic investigations on joining of ZrO2ceramic and TiAl alloy. In this study, reliable brazing of ZrO2ceramic and TiAl alloy was achieved using inactive AgCu filler metal. The interfacial microstructure of the joints was characterized by SEM, XRD and TEM. Effects of holding time on the microstructure and mechanical properties of the joints were investigated in details. The results revealed that Cu3Ti3O + TiO layers were formed adjacent to ZrO2ceramic while AlCu2Ti layer was formed at TiAl substrate. The thickness of Cu3Ti3O + TiO layers increased and the granular AlCu2Ti coarsened gradually with the prolongation of holding time. The hardness and Young's modulus of reaction phases were characterized by nano-indentation to reveal the plastic deformability. The highest shear strength of 48.4 MPa was achieved when brazed at 880 °C for 10 min.