Packed bed carburization of tantalum and tantalum alloy

Details Packed bed carburization of tantalum and tantalum alloy Packed bed carburization of tantalum and tantalum alloy

1998-04-20

1999-06-29

Sheehan, John

Metal treatment

Process of modifying or maintaining internal physical...

Carburizing or nitriding using externally supplied carbon or...

216108, C23C 864

Patent

active

059163771

ABSTRACT:
Packed bed carburization of a tantalum or tantalum alloy object. A method for producing corrosion-resistant tantalum or tantalum alloy objects is described. The method includes the steps of placing the object in contact with a carburizing pack, heating the packed object in vacuum furnace to a temperature whereby carbon from the pack diffuses into the object forming grains with tantalum carbide along the grain boundaries, and etching the surface of the carburized object. This latter step removes tantalum carbides from the surface of the carburized tantalum object while leaving the tantalum carbide along the grain boundaries.

REFERENCES:
patent: 5383981 (1995-01-01), de Pruneda
Patrick J. Rodriguez, "Characterization and Refinement of Carbide Coating Formation Rates and Dissolution Kinetics in the Ta--C System," Master's Thesis, Department of Mechanical Engineering, The University of New Mexico, Albuquerque NM, describes the carburization process which is the subject of the present invention, Oct. 1996.

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