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FENG Guangjie, LI Zhuoran, Xu Kai, LIU Wenbo. Interface microstructure and mechanism of SiC ceramic vacuum brazed joint[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2014, 35(1): 13-16.
Citation: FENG Guangjie, LI Zhuoran, Xu Kai, LIU Wenbo. Interface microstructure and mechanism of SiC ceramic vacuum brazed joint[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2014, 35(1): 13-16.
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Interface microstructure and mechanism of SiC ceramic vacuum brazed joint

  • 1.

    State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China

  • 2.

    AVIC Harbin Dongan Engine Co., Ltd, Harbin 150066, China

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  • Received Date: December 09, 2012
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    • Abstract
  • Vacuum brazing of SiC ceramic was conducted using Ti-Zr-Ni-Cu solder. The interface microstructure and its formation mechanism was investigated. Scanning electron microscope (SEM) was used to observe the joint microstructure and conduct local energy spectrum analysis. The results show that the products in the joint interface were mainly TiC,Ti5Si3,Zr2Si, Zr(s,s),Ti(s,s)+Ti2 (Cu,Ni) and (Ti,Zr) (Ni,Cu) phases. The microstructure of the joint interface could be expressed as SiC/TiC/Ti5Si3+Zr2Si/Zr(s,s)/Ti(s,s)+Ti2 (Cu,Ni)/(Ti,Zr) (Ni,Cu). The brazing process could be divided into five stages:physical contact between the solder and substrate, melting of solder and formation of reaction layer on the ceramic side,continuous diffusion of melted solder into the substrate, thickness increasing of reaction layer,composition homogenization, ending of reaction on ceramic side and formation of hypereutectic structure,solidification of intermetallic compounds in the center of joint. The shear strength of the joint brazed at 960℃ for 10min reached 110 MPa.
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