Microstructure and mechanical properties of SiCf/SiC joints brazed using CaO MgO Al2O3SiO2 glass
| Autor: | Juanli Deng, Baofu Lu, Laifei Cheng, Litong Zhang, Bohan Zheng, Kaiyue Hu, Shangwu Fan |
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| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Thermal shock Materials science Scanning electron microscope Process Chemistry and Technology 02 engineering and technology 021001 nanoscience & nanotechnology Microstructure 01 natural sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Shear (sheet metal) Soldering 0103 physical sciences Materials Chemistry Ceramics and Composites Shear strength Brazing Direct shear test Composite material 0210 nano-technology |
| Zdroj: | Ceramics International. 45:8890-8898 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2019.01.218 |
| Popis: | In this work, SiC fiber reinforced SiC matrix (SiCf/SiC) composites were joined using CaO MgO Al2O3 SiO2 glass (CMAS) at 1200–1400 °C in vacuum. The microstructures, phase composition, mechanical properties and thermal shock resistance of the joints were investigated by scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDS), X-ray powder diffraction (XRD), single-lap compressive shear test, and thermal shock test, respectively. The results showed that joints composed of CMAS glass were dense and crack-free, contributing to high shear strength of 45.7 MPa and good tightness at the brazing temperature of 1400 °C. In addition, a large number of SiCf/SiC composites was torn off by solder after the shear test, indicating that the bonding strength of joining interface was robust. After successive thermal shocking at 1200 °C for one, two, and three times, the shear strengths of the joints brazed at 1400 °C were 86.7%, 71.0%, and 57.7% of that without thermal shocking, respectively. |
| Databáze: | OpenAIRE |
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