Method for forming carbide coating on various metals and their alloys
A method is described for forming a carbide coating on a metal substrate selected from the group consisting of Group IVA metals, Group VA metals, Group VIA metals and alloys of said metals which comprises: providing a bath consisting essentially of a molten metal under an inert gas atmosphere wherein the molten metal is selected from the group consisting of alkali metals, alkaline earth metals and mixtures thereof; and then dissolving in the molten metal bath an amount of carbon from about two percent to about twenty percent by weight of the mixture of molten metal and carbon; placing the metal substrate in the molten metal bath containing dissolved carbon; maintaining the metal substrate in the molten metal bath until a carbide coating is formed on the metal substrate; and removing the carbide coated metal substrate from the molten metal bath; wherein the metal substrate is heated in an atmosphere containing nitrogen for a sufficient time to form a visual nitride layer on the surface of the metal substrate before the metal substrate is placed in the molten metal bath.
- Assignee:
- Rostoker, Inc., Burnham, IL (United States)
- Patent Number(s):
- US 5234721; A
- Application Number:
- PPN: US 7-358549
- OSTI ID:
- 6301990
- Country of Publication:
- United States
- Language:
- English
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