Brazing of micrograin-filled quartz fiber reinforced silica composites and Invar using Ag-21Cu-4.5Ti alloy |
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| Authors: | Lei Zhao JiCai Feng XiaoYu Tian LiXia Zhang Peng He |
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| Affiliation: | ZHAO Lei,FENG JiCai,TIAN XiaoYu,ZHANG LiXia & HE Peng State Key Laboratory of Advanced Welding Production Technology,Harbin Institute of Technology,Harbin 150001,China |
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| Abstract: | Brazing of quartz fiber reinforced silica composites (QFSC) to Invar alloy was carried out in a vacuum at 1173 K for 10 min using Ag-21Cu-4.5Ti metal filler. Experiments indicated that composites prefilled with CaCO3 micrograins had good wettability. The CaCO3 decomposed to CaO during brazing. After brazing, a joint of structure QFSC/3CaO·2SiO2+Ti3O5+Fe2Ti+NiTi+Ag(s,s)+ Cu(s,s)/Invar was established. The shear strength of the brazed joint reached 11.6 MPa at room temperature, which is about five times the shear strength of that obtained without surface filling. |
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| Keywords: | composites wettability filler reinforcement brazing microstructure strength |
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