Połączenia lutowane aluminium z miedzią stalą niestopową i stopową wykonane spoiwami cynkowymi

Abstract

Połączenia lutowane aluminium z miedzią, stalą niestopową i stopową, wykonane spoiwami cynkowymi soldered joints aluminum with copper, unalloyed steel and alloy steel made of zinc binders Prof. dr hab. inż. Zbigniew Mirski, mgr inż. tomasz Wojdat -Politechnika Wrocławska. StreszczenieWykonywanie połączeń lutowanych aluminium z innymi metalami, takimi jak: miedź, stal niestopowa i stopowa, związane jest z dużymi trudnościami. Problemy te wynikają głównie ze zróżnicowanych właściwości fizykochemicznych i mechanicznych spajanych materiałów. Ponadto występuje niebezpieczeństwo tworzenia się twardych faz międzymetalicznych powodujących kruchość połączeń lutowanych.W artykule przedstawiono wyniki prób zwilżalności i rozpływności badanych materiałów spoiwami cynkowymi. Przeprowadzono również badania metalograficzne przy użyciu mikroskopii świetlnej oraz pomiary mikrotwardości i wytrzymałości na ścinanie połączeń lutowanych. abstractThe performance of the opposite soldered joints aluminum with other metals, such as: copper, unalloyed steel and alloy steel is linked to major difficulties. These problems arise mainly from diverse physicochemical and mechanical properties of jointing materials. Moreover, there is a danger of creating a hard intermetallic phases causing fragility soldered joints.The results of wattability trials and surface area of melt zinc solder on tested materials are showed in the article. Also conducts metallographic research using illuminating microscopy and microhardness measurements and for shear strength soldered joints.

Effect of the Preparation of Aluminium, Magnesium and Titanium Alloys Surface on Properties of Adhesive Bonded Joints

“…Aluminium also has a relatively low melting point (approximately 660°C) and high affinity for oxygen (leading to the formation of a high-melting film of Al₂O₃ oxides on the surface). Because of the foregoing, aluminium and its alloys are rated among materials difficult to join [7]. In its pure form, the metal is not characterised by particularly favourable mechanical properties.…”

Soldering of aluminium with copper and steel using intermediate layer Zn–Ni

“…However, they do not guarantee sufficient wettability of copper grade Cu-ETP [9]. Insufficient wettability of copper with zinc-based solders does not make the only problem.…”

“…Insufficient wettability of copper with zinc-based solders does not make the only problem. As announced in [9], on the interface between Zn-solders and copper Cu-ETP and steel DC01 created are hard reactive zones entailing brittleness of soldered joints with aluminium. The reactive zones can be composed of intermetallic phases of the system Al-Cu or Al-Fe [11][12][13].…”

“…It was demonstrated in [9] that a 20 mm thick zinc layer applied on surface of unalloyed steel by hot galvanising effectively restricts forming a reactive zone on the interface between substrate and solder. However, in comparison with a Zn layer, the Zn-Ni layer demonstrates ten times higher corrosion resistance (as proved by tests in a salt spray chamber).…”

“…This is caused by absence of universal solders and fluxes well wetting surfaces of a wide group of materials. This is especially difficult in the case of making dissimilar-metal joints with aluminium that is one of harder solderable engineering materials, which is decided by its following properties [5][6][7][8][9]:…”