摘要
Vacuum brazing of SiO2 glass ceramic and TC4 alloy using a commercially available TiZrNiCu foil was investigated. The interfacial microstructure and the fractures were examined with an optical microscope （OM） and an S-4700 scanning electron microscope （SEM） equipped with an energy dispersive spectrometer （EDS） and an electron probe X-ray microanalyzer （EPMA）. The structure of joint interface was identified by XRD （JDX-3530M）. Meanwhile, the fracture paths of the joints were comprehensively studied. The results show that processing parameters, especially the brazing temperature, have a significant effect on the microstructure and mechanical properties of joints. The typical interface structure is SiO2/Ti2O＋Zr3Si2＋Ti5Si3/（Ti,Zr）＋Ti2O＋ TiZrNiCu/Ti（s.s）/TiZrNiCu＋Ti（s.s）＋Ti2（Cu,Ni）/TC4 from SiO2 glass ceramic to TC4 alloy side. Based on the mechanical property tests, the joints brazed at 880 ℃ for 5 rain has the maximum shear strength of 23 MPa.
Vacuum brazing of SiO2 glass ceramic and TC4 alloy using a commercially available TiZrNiCu foil was investigated. The interfacial microstructure and the fractures were examined with an optical microscope(OM) and an S-4700 scanning electron microscope(SEM) equipped with an energy dispersive spectrometer(EDS) and an electron probe X-ray microanalyzer(EPMA) . The structure of joint interface was identified by XRD(JDX-3530M) . Meanwhile,the fracture paths of the joints were comprehensively studied. The results show that processing parameters,especially the brazing temperature,have a significant effect on the microstructure and mechanical properties of joints. The typical interface structure is SiO2/Ti2O+Zr3Si2+Ti5Si3/(Ti,Zr) +Ti2O+ TiZrNiCu/Ti(s.s) /TiZrNiCu+Ti(s.s) +Ti2(Cu,Ni) /TC4 from SiO2 glass ceramic to TC4 alloy side. Based on the mechanical property tests,the joints brazed at 880 ℃ for 5 min has the maximum shear strength of 23 MPa.
基金
Project(50705022) supported by the National Natural Science Foundation of China
Project(HIT0804) supported by the Foundation of the National Key Laboratory of Precision Hot Processing of Metals,China
Project supported by Program of Excellent Team in Harbin Institute of Technology,China
