SURFACE TREATMENT FOR IMPROVED BONDING IN BI-METALLIC CASTING

摘要

Methods of forming bi-metallic castings are provided. In one method, a metal preform of a desired base shape is provided defining a substrate surface. A natural oxide layer is removed from the substrate surface, yielding a cleaned metal preform. The method includes forming a thin metallic film on at least a portion of the substrate surface of the cleaned metal preform, and metallurgically bonding the portion of the metal preform having the metallic film with an overcast metal to form a bi-metallic casting. The metallic film promotes a metallurgical bond between the metal preform and the overcast metal. In one aspect, the metal preform may comprise aluminum (Al) and the metallic film may comprise zinc (Zn).

主权项

1. A method of forming a bi-metallic casting, the method comprising:
providing a metal preform of a desired base shape defining a substrate surface; removing a natural oxide layer from the substrate surface, yielding a cleaned metal preform; forming a thin metallic film on at least a portion of the substrate surface of the cleaned metal preform; and metallurgically bonding the portion of the metal preform having the metallic film with an overcast metal to form a bi-metallic casting, wherein the metallic film promotes a metallurgical bond between the metal preform and the overcast metal.