Microstructures and Oxidation Behavior According to Nb:Mo ratio in a Nb–Mo–Si System with Si Pack Cementation Coatings

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ID: 67090
2019
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Abstract
Research is being conducted on Mo- and Nb-based alloys that are used in the aerospace sector, including those used for advanced gas turbines and aircraft engines. There is a limit to using Mo, which has a high density among refractory metals, and a few studies exist describing the addition of Nb to Mo−silicide alloys. There is a lack of guidance research on the basic Nb:Mo ratio of alloys, and it is necessary to study how to improve oxidation resistance. Therefore, this study aims to improve oxidation resistance by controlling the ratio of Nb and Mo in (Nbx, Moy)Si2 coating layers with Si pack cementation coatings on Nb−Mo alloys. Static oxidation tests were carried out at 1200 °C for 6 h to confirm the oxidation characteristics. As a result, a SiO2 or SiO2 + Nb2O5 ceramic protective layer was formed on the surface. After the oxidation tests, alloys with a Nb content of less than 35 at.% were found to protect the surface. The ratios of Nb and Mo in the Nb−Mo alloy and silicide coating layer were compared, and the improvement of oxidation resistance is discussed in terms of microstructural evolution.
Reference Key
yang2019microstructurescoatings Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Yang, Wonchul;Chung, Choong-Heui;Lee, Sangyeob;Lee, Jong Won;Park, Joon Sik;
Journal coatings
Year 2019
DOI
DOI not found
URL
https://www.mdpi.com/2079-6412/9/12/772
Keywords
Engineering (General). Civil engineering (General)

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