Campus Units

Ames Laboratory, Materials Science and Engineering

Document Type

Article

Publication Version

Accepted Manuscript

Publication Date

3-15-2019

Journal or Book Title

Applied Surface Science

Volume

470

First Page

289

Last Page

295

DOI

10.1016/j.apsusc.2018.11.167

Abstract

The oxidation behavior and microstructures of a three phase Mo50W20Si15B15 alloy containing (Mo, W) solid solution, (Mo, W)5Si3 and (Mo, W)5SiB2 were investigated over the 1000–1300 °C temperature range. At 1300 °C, the alloy exhibited a large initial mass loss and eventually transitioned to a steady state behavior associated with the development of an amorphous borosilica scale. The oxidation resistance at lower temperature was unsatisfactory due to the pesting of Mo and W. Grazing Incident Angle X-ray Diffraction (GIXRD) measurements during the initial transient stage of oxidation identified the evolution of surface oxide products that were responsible for the large weight loss and pesting behavior. In order to address the large initial weight loss and the low temperature pesting behavior, the alloy was coated with a Mo-Si-B based coating by employing the pack cementation process followed by a conditioning treatment at 1450 °C. The microstructures of the coatings and the interlayer between the base alloy and the coating were studied, and the oxidation resistance of the coated alloys was evaluated over the 800–1300 °C temperature range. The coated alloy showed improved oxidation resistance with nearly zero mass change for extended period of time over the entire range of temperatures studied.

Comments

This is a manuscript of an article published as Ouyang, Gaoyuan, Pratik K. Ray, Srinivasa Thimmaiah, Matthew J. Kramer, Mufit Akinc, Patrick Ritt, and John H. Perepezko. "Oxidation resistance of a Mo-W-Si-B alloy at 1000–1300° C: The effect of a multicomponent Mo-Si-B coating." Applied Surface Science 470 (2019): 289-295. DOI: 10.1016/j.apsusc.2018.11.167. Posted with permission.

Creative Commons License

Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.

Copyright Owner

Elsevier B.V.

Language

en

File Format

application/pdf

Available for download on Sunday, November 22, 2020

Published Version

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