Bimetallic barrel head for processing corrosive metals and a method of manufacture thereof
Publication Date: 2003-May-05
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In accordance with the present invention, components of the barrel assembly may be manufactured from a Ni-based superalloy body (i.e. substrate) with a Co-based liner applied to all surfaces that could come into contact with the processing alloy. The Ni-based superalloy body provides high-temperature strength, and ductility. The application of a low C content, Co-based, crack free liner on any melt channel surface protects the Ni-based shell against contact with molten processing alloy. Similarly, the application of a high C content, Co-based coat, applied to sealing surfaces provides for proper sealing by preventing high-temperature yielding and also protects Ni-based superalloy against contact with the processing alloy.