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1270 |
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Tuesday, June 03, 2008, Room 04 10:50 AM Corrosion Protection 2 Corrosion protection through thermal sprayed coatings including cathodic and high temperature corrosion, coating of large areas for offshore facilities and comparable applications |
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FeNiW-coatings for casting molds in the aluminium industry |
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Simon Jahn* / TU Ilmenau, Germany Johannes Wilden / TU Ilmenau, Germany Victor Drescher/ TU Ilmenau, Germany Sebastian Reich/ TU Ilmenau, Germany |
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Casting molds in the aluminium industry show a short lifespan, due to the high corro-siveness of aluminium melts and alternating thermal and mechanical loads. By using new materials, in example pseudoalloys containing tungsten, the lifetime of casting molds can be elongated up to hundredfold. Today casting molds made of steel are state of the art. In spite of the advantages of pseudoalloys, high manufacturing cost and the increasing commodity price of tungsten prohibit the use of molds consisting of these progressive materials. By coating the standard steel molds with a FeNiW-layer the excellent thermal and corrosive resistance of the pseudoalloy surface can be combined with minimal manu-facturing costs. In the present work steel substrates will be coated with FeNiW-pseudoalloys. There-fore arc spraying and different cladding processes (Laser, Plasma, TIG) should be compared. By modifying the machine parameters a smooth transition between sub-strate and coating should be realized. Thermal and chemical resistance of the sam-ples will be tested. This paper deals with the first results. |