Casting alloys and method of making composite barrels used in extrusion and injection molding

摘要

A composite barrel for use in extrusion or injection molding is disclosed. The composite barrel includes an outer housing having a cylindrical bore that extends throughout the length of the outer housing. A wear-resistant lining is disposed on an interior surface that defines the cylindrical bore. The lining is fabricated from an alloy that includes a base metal and phosphorus and the lining may contain hard abrasion-resistant particulate, such as tungsten carbide. The base metal is nickel or cobalt or a mixture of nickel and cobalt. The alloy is typically applied by centrifugal casting and can be cast in a nitrogen-rich atmosphere without creating undesirable lining porosity. Such linings can be made for a fraction of the cost of comparable linings that must be cast under vacuum or in an atmosphere of argon.