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Published November 1, 1985 | public
Journal Article Open

Refractory amorphous metallic (W0.6Re0.4)76B24 coatings on steel substrates


Refractory metallic coatings of (W0.6Re0.4)76B24 (WReB) have been deposited onto glass, quartz, and heat-treated AISI 52100 bearing steel substrates by dc magnetron sputtering. As-deposited WReB films are amorphous, as shown by their diffuse x-ray diffraction patterns; chemically homogeneous, according to secondary ion mass spectrometry (SIMS) analysis; and they exhibit a very high (~1000°C) crystallization temperature. Adhesion strength of these coatings on heat-treated AISI 52100 steel is in excess of ~20, 000 psi and they possess high microhardness (~2400 HV50). Unlubricated wear resistance of such hard and adherent amorphous metallic coatings on AISI 52100 steel is studied using the pin-on-disc method under various loading conditions. Amorphous metallic WReB coatings, about 4 µm thick, exhibit an improvement of more than two and a half orders of magnitude in the unlubricated wear resistance over that of the uncoated AISI 52100 steel.

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Copyright © 1985 American Institute of Physics. Received 30 April 1985; accepted 16 July 1985. The work in this paper was carried out by the Jet Propulsion Laboratory, California Institute of Technology, and was sponsored by the U.S. Department of Energy, Office of Energy Systems Research, Division of Energy Conversion and Utilization Technology (ECUT) through an agreement with the National Aeronautics and Space Administration. We are thankful to Joe Carpenter of the Oak Ridge National Laboratory, technical Manager of the ECUT Materials Project, for useful discussions.


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