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| Abstract No.: |
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Scheduled at:
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Tuesday, May 04, 2010, Moor Room 12:20 PM
Industrial Engineering
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| Title: |
Tungsten-based coatings to increase the lifetime of permanent-mold casting molds
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| Authors: |
Viktor Drescher* / Berlin Institute of Technology
Sekr. PTZ 6, Germany
Johannes Wilden / Berlin Institute of Technology, Germany
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| Abstract: |
Molten metals are extremely corrosive against steel-made molds. In addition to alternating thermal loads and erosion by hard particles the lifetime of molds in the permanent-mold casting industry is rather short.
Tungsten-based pseudoalloys are able to increase the lifetime of these molds significantly, but, by now, their use is limited to sintered inlays at the mostly stressed parts of the mold. Coating the whole mold with these materials offers an increase of the lifetime and at the same time a reduction of the amount of deployed feedstock. Within this research project it was possible to increase the lifetime of a kernel in used in casting brass by a factor of 20 by cladding it with tungsten-based pseudoalloys.
The metallurgical behaviour of the tungsten-based pseudoalloys is quite complex. By modifying the coating process different shapes and amounts of tungsten precipitations in the nickel-iron-binder can be realized. The different microstructure within the coating does strongly affect the mechanical and anti-corrosion properties of the coating.
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