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ZOU Wenjiang, CHEN Bo, LI Wenwen, XIONG Huaping. Microstructures and joining mechanism of vacuum brazing of SiO2f/SiO2 composite to Mo alloy using Ag-Cu-In-Ti brazing fillers mechanism[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2015, 36(12): 73-76.
Citation: ZOU Wenjiang, CHEN Bo, LI Wenwen, XIONG Huaping. Microstructures and joining mechanism of vacuum brazing of SiO2f/SiO2 composite to Mo alloy using Ag-Cu-In-Ti brazing fillers mechanism[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2015, 36(12): 73-76.

Microstructures and joining mechanism of vacuum brazing of SiO2f/SiO2 composite to Mo alloy using Ag-Cu-In-Ti brazing fillers mechanism

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  • Received Date: March 30, 2015
  • Three kinds of Ag-Cu-In-Ti brazing filler were designed for joining of SiO2f/SiO2 composite to Mo alloy. The brazing experiment was conducted at 800 ℃ for 10 min under vacuum condition. The joint shear strengths were tested at ambient temperature. The microstructures were observed under a scanning electron microscopy(SEM), and the reaction products were analyzed by EPMA, EDS and XRD. The results show that the joints brazed with 1# brazing filler offer the maximum shear strength of 24.1 MPa. Part of Ti element is enriched at interfacial reaction layer, the other part is distributed within the joint matrix as Cu3Ti to enhance the joint. The mechanism of joining SiO2f/SiO2 composite by Ag-Cu-In-Ti brazing filler is the reaction of Ti with SiO2: Ti+SiO2→TiSi2+TiO, followed by the subsequent reaction: Ti+Cu+O→Cu3Ti3O. The product sequence for 1# joint can be described as the following: SiO2→Cu3Ti3O+TiO+TiSi2→Ag(s,s)/Cu3Ti/Cu(s,s)→Cu3Ti+TiO→Mo.
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