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Microstructure and mechanical strength of Ti3AlC2 joints bonded using oxides as interlayer |
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| Affiliation: | 1. Innovation Research Team for Advanced Ceramics, Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, 621900, China;2. Department of ATF R&D, China Nuclear Power Technology Research Institute, China General Nuclear Power Corporation (CGN), Shenzhen, 518026, China;1. Department of Materials Science & Engineering, Drexel University, Philadelphia, PA 19104, USA;2. College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China;3. GE Global Research, 1 Research Circle, Niskayuna, NY 12309, USA;1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;2. University of Chinese Academy of Sciences, Beijing 100039, China |
| Abstract: | Ti3AlC2 ceramics were successfully joined with TiO2 and Nb2O5 respectively as interlayers via solid-state diffusion bonding at 1300 °C. The joints bonded with TiO2 and Nb2O5 exhibit distinct microstructures. Two continuous thin Al2O3 oxidation layers with a thickness around 1 μm were formed in the joints bonded with TiO2. Between the oxidation layers there exists a dense oxycarbide (TiC1-xOx) layer. For the joint bonded with Nb2O5, a dense bonding layer with Nb2AlC and Nb4AlC3 grains surrounded by thin Al2O3 oxidation layers at the grain boundaries were obtained. The shear strength of the final joints shows clear dependences on both the thickness and microstructure of the joints. Smaller joint thickness and the microstructure with complex phases favour for higher shear strength. Those result implies that bonding with oxides is a practical and efficient method for joining Ti3AlC2. |
| Keywords: | Ti3AlC2 Ceramic joining Oxides Diffusion bonding Shear strength |
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