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Effect of Al content on microstructure and cyclic oxidation performance of Pt-aluminide coatings
2002 (English)In: Oxidation of Metals, Vol. 57, no 3-4, 245-266 p.Article in journal (Refereed) Published
Abstract [en]

The effect of Al content, i.e., the amount of Al picked up during aluminizing, on the microstructure and cyclic oxidation properties of Pt-aluminide coatings has been investigated. The cast Ni-base superalloy CM-247 was used as the substrate material and a single-step, high-activity pack aluminizing process was used to produce the Pt-aluminide coatings. The Al content of these coatings was varied by using packs with different compositions of the Al source. Pt-aluminide coatings having three different Al contents, namely 6.5, 16, and 21 mg cm-2, were evaluated for their cyclic oxidation resistance at 1200°C in air. It was found that the Pt-aluminide coatings, irrespective of their Al contents, evolve in the same manner during aluminizing and result in a three-layer structure with an outer PtAl2 + NiAl two-phase layer, an intermediate NiAl layer, and the inner interdiffusion layer. The stability of this three-layer coating structure over long periods of aluminizing, however, is dependent on the availability of Al from the pack during this period. Below a certain threshold Al availability, the two-phase outer layer transforms to a single-phase NiAl structure causing the coating to change from its three-layer structure to a two-layer one. Cyclic oxidation results indicate that, while a minimum Al content in Pt-aluminide coatings is essential for deriving the best oxidation performance, increasing the Al content beyond a certain level does not significantly enhance oxidation behavior. The effect of Al content on aspects, such as coating degradation and nature of coating-surface damage during cyclic oxidation, is also discussed.

Place, publisher, year, edition, pages
2002. Vol. 57, no 3-4, 245-266 p.
Keyword [en]
Aluminizing, Oxidation-resistant coating, Pt-aluminide coating, Superalloy, Aluminum, Coatings, Microstructure, Oxidation resistance, Cyclic oxidation, Platinum
Identifiers
URN: urn:nbn:se:hv:diva-8432ISBN: 0030770X (ISSN) OAI: oai:DiVA.org:hv-8432DiVA: diva2:860109
Available from: 2015-10-10 Created: 2015-10-08 Last updated: 2015-10-10Bibliographically approved

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Joshi, S. V.

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