5005鋁合金與4J34可伐合金的真空釬焊工藝Process of vacuum brazing 5005 aluminum alloy to 4J34 Kovar alloy

利用Al-Si-Mg釬料實(shí)現(xiàn)5005鋁合金與4J34可伐合金的真空釬焊，研究了接頭界面結(jié)構(gòu)及其形成機(jī)理，分析了釬焊溫度及保溫時(shí)間對(duì)接頭界面結(jié)構(gòu)和抗剪強(qiáng)度的影響。結(jié)果表明：隨著釬焊溫度的升高和保溫時(shí)間的延長(zhǎng)，接頭的抗剪強(qiáng)度先升高后降低；當(dāng)釬焊溫度為580 ℃、保溫時(shí)間為15 min時(shí)，接頭抗剪強(qiáng)度達(dá)到最大值81 MPa，此時(shí)，接頭的典型界面結(jié)構(gòu)為4J34可伐合金/FeAl/FeAl₃/Fe_mAl_n+α(Al)/5005鋁合金。接頭的斷裂形式主要受釬焊溫度的影響；當(dāng)釬焊溫度較低時(shí)，接頭斷裂于鋁合金側(cè)氧化膜層及鋁合金內(nèi)；當(dāng)溫度升高至580 ℃時(shí)，接頭斷裂于Fe_mAl_n+α(Al)反應(yīng)層中。

Vacuum brazing of 5005 aluminum alloy and 4J34 Kovar was carried out with Al-Si-Mg filler foil as braze alloy. Various brazing heating cycles were carried out to study the effects of brazing parameters on the joint interface and mechanical properties. The results show that the shear strength of the joints increases firstly, and then decreases with increasing brazing temperature and holding time. According to the mechanical property tests, the joints brazed at 580 ℃ for 15 min obtain the maximum shear strength of 81 MPa, and the typical interface structure of the joints is 4J34 Kovar/FeAl/FeAl₃/Fe_mAl_n+α(Al)/5005 aluminum alloy from 4J34 Kovar to 5005 aluminum alloy side. The fracture form of the joints is mainly affected by brazing temperature. When the brazing temperature is low, the joints fracture on the oxide layer and aluminum alloy. When the temperature is high, the joints fracture on Fe_mAl_n+α(Al) layer.

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