Microstructure and fracture behavior of SiO2 glass ceramic andTC4 alloy joint brazed with TiZrNiCu alloy

来源期刊:中南大学学报(英文版)2009年第5期

论文作者:刘多 张丽霞 冯吉才 刘洪斌 何鹏

文章页码:713 - 718

Key words:SiO2 glass ceramic; TC4 alloy; brazing; joints interface; microstructure; mechanical properties

Abstract: 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.

基金信息:supported by the National Natural Science Foundation of China
the Foundation of the National Key Laboratory of Precision Hot Processing of Metals, China

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