Strategy to Improve the High-Temperature Mechanical Properties of Cr-Alloy Coatings

M. J. L. GINES; F. J. WILLIAMS; C. A. SCHUH

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE

SPRINGER

Año: 2007 vol. 38A p. 1367 - 1370

1073-5623

Electroplated Cr-C alloy coatings exhibit significant increases in hardness and strength when exposed to elevated temperatures up to about 600oC, owing to the evolution of their nanostructure. In this communication we describe a strategy by which this evolution can be shifted to even higher temperatures (approaching 850oC), through a ternary addition of phosphorus. The resulting Cr-C-P coatings may be suitable for applications at higher service temperatures, where more conventional Cr-based coatings soften rapidly.