Interfacial microstructure and mechanical properties of ZTA/ZTA joints brazed with Ni-Ti filler metal |
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Authors: | Kaihong Zheng Qi Zhang Juan Wang Yao Lu |
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Affiliation: | 1. Institute of Materials and Processing, Guangdong Academy of Sciences, Guangzhou 510650, PR China;2. School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, PR China;3. Guangdong Provincial Key Laboratory of Metal Toughening Technology and Application, Guangzhou 510650, PR China |
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Abstract: | The reliable brazing of the ZTA ceramic joints was successfully obtained using Ni-Ti filler metal. The microstructure and mechanical properties of the joints brazed at different temperatures were investigated. During the process of brazing, both Al2O3 and ZrO2 in the ZTA reacted with the Ni-Ti filler, resulting in the formation of the AlNi2Ti + Ni2Ti4O reaction layer adjacent to the ZTA substrate when brazed at 1350 °C for 30 min. NiTi and Ni3Ti compounds precipitated at the center of brazing seam. When the brazing temperature increased from 1320 °C to 1380 °C, the thickness of AlNi2Ti + Ni2Ti4O layer increased gradually. As the brazing temperature varied from 1400 °C to 1450 °C, TiO was formed adjacent to the ZTA substrate, along with the reduction of Ni2Ti4O. AlNi2Ti distributed at the interface and center of brazing seam. The maximum shear strength of 152 MPa was obtained when brazed at 1420 °C for 30 min. |
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Keywords: | ZTA ceramics Ni-Ti filler Interfacial microstructure Mechanical properties |
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