Abstract
This study focuses on the design, characterization and testing of a novel anorthite based glass-ceramic solder for joining dense Si3N4 and porous Si3N4 ceramic. It was found that the glass solder possesses a favorable wetting ability on two ceramic surfaces. Additionally, the influence of crystallization treatment on the microstructure and shear strength of joints was investigated. The results showed that CaAl2Si2O8 was the main product in the seam. After crystallization treatment, the crystallinitiy of the seam and shear strength of joints were improved obviously. The shear strength of joints after crystallization was 52 MPa at room temperature, and it increased to 59 MPa at 850°C. Finally, the joining mechanism of the dense Si3N4/glass-ceramic/porous Si3N4 bonded joints was proposed. Intergranular diffusion of elements was identified as the main mechanism of bonding in the interface of dense Si3N4/glass-ceramic. In the porous Si3N4 side, the bonding was achieved by infiltration that was controlled by capillarity and resistance of the viscous forces.
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This work was supported by the National Natural Science Foundation of China (Grant Nos. 51872060, 51621091, U1537206), and the Nation Key Research & Development Plan (Grant No. 2017YFA0403804).
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Fang, J., Zhang, J., Liu, C. et al. Joining dense Si3N4 to porous Si3N4 by using an anorthite based glass-ceramic. Sci. China Technol. Sci. 63, 1538–1548 (2020). https://doi.org/10.1007/s11431-020-1653-y
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DOI: https://doi.org/10.1007/s11431-020-1653-y