【摘 要】
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To solve corrosion failure problem of the copper-filler-brazed oil coolers, a new iron-base filler metal was designed, in which elements Si and B as well as Cu-Ti binary alloy were added as the temper
【机 构】
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Welding and Plastic Forming Division, Beijing Institute of Aeronautical Materials, AVIC, Beijing 100
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To solve corrosion failure problem of the copper-filler-brazed oil coolers, a new iron-base filler metal was designed, in which elements Si and B as well as Cu-Ti binary alloy were added as the temperature depressants.This brazing alloy was fabricated into filler foils by a rapidly-solidifying technique.The addition of Cu-Ti binary alloy decreased the needed amount of Si and B, thus it had an effect on the improvement in the mechanical properties of the brazed joints.Vacuum brazing of stainless steel was carried out at 1120 ℃ for 15 min.The corresponding joint microstructure was analyzed by means of SEM, XEDS and XRD, and typical joint was mainly composed of solid solution with a small quantity of (Fe, Cr)2B, (Ti, Fe)B and (Fe, Ni, Ti)B compounds.The brazed joints offered an average tensile strength of 375.3 Mpa at room temperature, about 15% higher than that of copper-filler-brazed under the identical joining condition.Moreover, compared with nickel-base filler metal, the new iron-base filler metal showed the advantages of lower cost and better mechanical properties.
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