Metallurgical Transactions A

, Volume 19, Issue 9, pp 2163–2170 | Cite as

Evaluation of high-Temperature diffusion barriers for the Pt-Mo system

  • Richard P. Walters
  • Bernard S. Covino
Article
Received:

Abstract

The United States Department of the Interior, Bureau of Mines, has studied the effectiveness of dif-fusion barriers in preventing interdiffusion between a molybdenum alloy (TZM), Mo-0.5Ti-0.07Zr-0.01C, and electrodeposited platinum coatings. Studies were conducted at 1200°, 1300°, and 1400 °C for 10, 5, and 2.5 hours, respectively, in a vacuum furnace. Diffusion barriers tested were TiC, TiN, TaC, TiB2, TiB2/TiC, and TiB2/TiN. Coatings of the diffusion barriers were applied by chemical vapor deposition (CVD) with the exception of the TiB2 coatings, which were applied by electrodeposition from a molten metaborate electrolyte. The platinum coatings were applied by elec-trodeposition from a molten cyanide electrolyte. Of the barrier materials tested, TaC shows the most promise because it extended the useful lifetime of platinum coated TZM by a factor of at least 2.

Keywords

Molybdenum Metallurgical Transaction Diffusion Barrier Electron Microprobe Analysis Metaborate 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© The Metallurgical of Society of AIME 1988

Authors and Affiliations

  • Richard P. Walters
    • 1
  • Bernard S. Covino
    • 1
  1. 1.Supervisory Research ChemistsAlbany Research Center, Bureau of MinesAlbany

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