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Dissolution and Erosion Phenomena in the Brazing of Aluminum Heat Exchangers

Mirski Zbigniew, Pabian Jarosław, Wojdat Tomasz

Archives of Metallurgy and Materials

2021

Vol. 66, iss. 4

1131--1140

On the basis of research, the mechanisms of dissolution and erosion during brazing of aluminium alloys and the influence of these phenomena on brazed joints of heat exchangers are presented. A number of factors have been identified that affect the formation of these phenomena during brazing aluminium alloys, these include: the maximum temperature and holding time at brazing temperature, and the type and amount of filler metal. The research was supported by examples of dissolution and erosion phenomena during series production of aluminium heat exchangers using three brazing profiles (normal, hot and very hot). It has been found that the dissolution of the engine radiator components during brazing, is from 18 to 68%, depending on the brazing profile used. For a very hot profile, erosion in part of the brazed exchanger, even destroys (removes) thin elements of the cooling fins.

Erosion phenomena in sand moulds

Chojecki A., Mocek J.

Archives of Foundry Engineering

2008

Vol. 8, iss. 1 spec.

49--52

Authors studied the erosion phenomena in sand moulds poured with cast iron. The study comprises an evaluation of erosion resistance of the three sands: green sand, sand bonded with inorganic or organic binder. It was concluded that the most resistant is the classic green sand with the addition of 5 % coal dust. Resistance of the sand with organic binder is generally weak and depends on kind of used raisin. Special attention was paid to the sands with no organic binder water glass and phosphate. It was found that their resistance depends on dehydratation conditions. When the mould is stored in law humidity of atmosphere the very strong erosion can be expected. It results from the micro fractures in the bridges of binders, joining the grains of the sable. This phenomena facilitates the tearing away of fragments of sand from the surface.