Study on Vacuum Brazing of 70%SiCp/Al Composites Using Al-Si-Ti-Cu-In Filler Metal

doi:10.3901/JME.2016.12.059

Abstract

Abstract: The 70%SiC_p/Al composites are brazed under different parameters in vacuum furnace, using Al-Si-Ti-Cu-In filler metal. Scanning electron microscope(SEM) and energy dispersive spectrometer(EDS) technology are used to analysis the microstructure, also shear test is adopted to examine the strength. The results reveal that the joints mainly contain honeycomb Al base phase, Ti, In rich phase, annular Si rich phase and needle-like Al₄C₃ phase. The maximum shear strength achieved in this work is 90.17 MPa which is welded at 600 ℃, 1.5 h and 6 MPa. Fracture origin occurs in the base material, extends to the filler metal, and fractures instantaneously in the other base material. With the temperature raising, poles in the welds decrease and narrow, meanwhile wettability between the composites and filler metal improves and the needle-like Al₄C₃ phase is restrained due to the activated Ti element. When the holding time elongates, poles in the joints decrease first, then increase, which is caused by the comprehensive effect of sintering disciplinarian and Kirkendall effect. If the holding time is long enough, poles in the welds will totally disappear. High pressure can compact the welds, restrain the needle-like Al₄C₃ phase and improve its morphology which improve the mechanical properties of the joints.

Key words: holding time, pressure, SiCp/Al composites, temperature, vacuum brazing

CLC Number:

TG425

LI Juan, WANG Kehong. Study on Vacuum Brazing of 70%SiC_p/Al Composites Using Al-Si-Ti-Cu-In Filler Metal[J]. Journal of Mechanical Engineering, 2016, 52(12): 59-66.

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Study on Vacuum Brazing of 70%SiC_p/Al Composites Using Al-Si-Ti-Cu-In Filler Metal

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