INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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Effect of Nb on Zr-based Filler and Brazing SiC Ceramics |
CAI Yuchen1, FENG Keqin1, ZHOU Bofang1,2, CHEN Sitan1
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1 School of Mechanical Engineering, Sichuan University, Chengdu 610065, China 2 School of Materials Science and Engineering, Hubei University of Automotive Technology, Shiyan 442002,Hubei,China |
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Abstract The effect of Nb addition in Zr-20Cu filler metal on the microstructure and properties of the filler metal and SiC ceramic brazing joints was studied. The results show that adding Nb to the brazing filler metal can obtain a good joint. The filler metal is composed of α-Zr, β-Zr, β-Nb, and CuZr2. Among them, CuZr2 decreases as Nb increases, thereby improving the corrosion resistance of the filler metal. Moreover, the filler metal can fill the gap between SiC ceramics without pores and cracks. After brazing, an interface reaction layer forms at the joint which mainly contains ZrC, Zr2Si, Nb2C and Nb5Si3. In addition, Nb2C and Nb5Si3 can reduce the brittleness of joints which work together with the solid solution strengthening of Nb to improve the shear strength of the joint. When the Nb content is between 0% and 10%, the shear strength heightens with the increase of Nb content. And it reaches the maximum when the Nb content is 10%, which is approximately 86 MPa. At the same time, a large number of dimples generate at the fracture. However, when the Nb content is added to 15%, the melting point of the filler metal increases, which makes the shear strength decline.
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Published:
Online: 2022-02-10
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Fund:This work was financially supported by Sichuan Science and Technology Program (2019YFG0225). |
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