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Advanced materials and brazing filler metals in vacuum brazed plate heat exchangers

A new nickel based filler metal alloy has been developed which posses very good casting, mechanical and corrosion properties. The filler metal is applicable in both ammonia and chlorine rich environments. The manufacturing of amorphous foils by the rapid solidification process has been optimized in order to achieve wide homogeneous foils with the demanded properties. Also, the brazing cycles for joining advanced materials by brazing in vacuum furnaces have been optimized. This has resulted in elaboration of a larger number of brazing cycles which are directly applicable for joining the material investigated. Moreover, the construction and design of the pressing tools for pressing sheets of foil for compact heat exchangers have been re-designed in order to meet the demands from the materials involved.

Finally, an extensive testing programme has been performed to acquire mechanical and corrosion data of a number of material combinations. For acquiring these important data, special designed specimens have been used for evaluating single brazed crosspoints which represent joints from compact brazed plate heat exchangers. The outcome of the work is an extensive database which is applicable in general for joining parts by brazing in many sectors of industry.

Contact

Peter Hauton GUNDEL
Tél.: +45-42914122
Fax: +45-42911704