Low-temperature joining of SiC ceramics with Y2O3-Al2O3 interlayer by SiO2-based liquid phase extrusion strategy |
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| Affiliation: | 1. School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou, 510006, China;2. Immobilisation Science Laboratory, University of Sheffield, Department of Materials Science and Engineering, Sir Robert Hadfield Building, Mappin Street, S13JD, UK;3. School of Material Science and Energy Engineering, Foshan University, Foshan, Guangdong, 528000, China;1. School of Materials and Chemistry, Southwest University of Science and Technology, Mianyang, 621010, Sichuan, China;2. State Key Laboratory of Environment-friendly Energy Materials, Southwest University of Science and Technology, Mianyang, 621010, Sichuan, China;1. Graduate Program in Mining, Metallurgical and Materials Engineering, Laboratory of Ceramics (LACER), Universidade Federal do Rio Grande do Sul, Osvaldo Aranha 99, Porto Alegre, 90035-190, Brazil;2. Universidade Federal do Pampa, Alegrete, Brazil;3. Department of Industrial Engineering, Universidade Federal do Rio Grande do Sul, Osvaldo Aranha 99, Porto Alegre, 90035-190, Brazil;1. School of Automotive and Traffic Engineering, Jiangsu University, Zhenjiang, China;2. SANKEN, Osaka University, Osaka, Japan;3. Faculty of Engineering, Sanjo City University, Sanjo, Japan;1. Laboratoire Multimatériaux et Interfaces, UMR CNRS 5615, Université Claude Bernard Lyon 1, France;2. Nantes Université, CNRS, Institut des Matériaux de Nantes Jean Rouxel, F-44000 Nantes, France;1. Institute of Materials, Ningbo University of Technology, Ningbo, 315016, PR China;2. Institute of Advanced Magnetic Materials, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou, 310012, PR China;3. GBA Branch of Aerospace Information Research Institute, Chinese Academy of Sciences, Guangzhou, 51070, PR China;4. Department of Chemistry, University of Management and Technology, Johar Town, Lahore, Pakistan;5. Haihua College, Liaoning Normal University, Dalian, 116400, PR China;6. School of Materials Science and Engineering, Dalian University of Technology, Dalian, 116024, PR China;1. School of Material Science and Engineering, Henan University of Technology, Zhengzhou, 450001, China;2. Henan Industrial School, Zhengzhou, 450001, China |
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| Abstract: | In order to reduce the joining temperature of SiC ceramics by glass-ceramic joining, some oxides were usually introduced into to Y2O3–Al2O3 for reducing the eutectic temperature. However, the joints might have poor high-temperature resistance due to the low melting point of the joining layer. In the present work, based on novel SiO2-based liquid phase extrusion strategy, joining of SiC ceramics with Y2O3–Al2O3 interlayer was carried out by using Y2O3–Al2O3–SiO2 as the filler through spark plasma sintering (SPS). The SiO2-free interlayer of Y2O3–Al2O3 was used for comparison. It was found that SiC joints using Y2O3–Al2O3 could be only joined at a high temperature of 1800 °C, and the thickness of the interlayer was about 20 μm. The shear strength of the joint obtained at 1800 °C was 89.62 ± 4.67 MPa and the failure located in the SiC matrix. By contrast, reliable joining of SiC ceramics could be finished at as low as 1550 °C by extrusion of SiO2-containing liquid phase when using Y2O3–Al2O3–SiO2 as the interlayer, alongside the interlayer thickness of only several microns. The joint strengths after joining at 1550 °C was 84.90 ± 3.48 MPa and the failure located in matrix position. The joining mechanism was discussed by combining the detailed microstructure analysis and phase diagram. |
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| Keywords: | SiC joining Liquid phase extrusion Joint strength |
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