Design of an alumina forming coating for Nb-base refractory alloys
Refractory multi-principal element alloys (RMPEAs) promise to significantly enhance gas turbine engine efficiency, but their poor oxidation performance inhibits their implementation. Alumina-forming bond coat alloys can provide oxidation protection, but discovering suitable chemistries remains a cha...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-03-01
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| Series: | Materials & Design |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127525000723 |
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| author | Collin S. Holgate Carolina Frey Melina A. Endsley Akane Suzuki Carlos G. Levi Tresa M. Pollock |
| author_facet | Collin S. Holgate Carolina Frey Melina A. Endsley Akane Suzuki Carlos G. Levi Tresa M. Pollock |
| author_sort | Collin S. Holgate |
| collection | DOAJ |
| description | Refractory multi-principal element alloys (RMPEAs) promise to significantly enhance gas turbine engine efficiency, but their poor oxidation performance inhibits their implementation. Alumina-forming bond coat alloys can provide oxidation protection, but discovering suitable chemistries remains a challenge. We employed a design methodology that screens for alumina-formation capability using Al activity and phase constitution predictions from CalPhaD (Thermo-Calc). Alloy down-selection from approximately 7,800 alloys in the Nb-Si-Ti-Al-Hf system was conducted via analysis of calculated thermodynamic properties with number-density topology style maps. This approach is validated by creating and testing the composition Nb12Si23Ti24Al36Hf5, which forms protective alumina scales up to 1400 °C and resists pesting at 800 °C. Further, the alloy has an average coefficient of thermal expansion of ∼10.1 ppm/K, making it well matched to Nb-based refractory alloys. The methodology will be useful for the design of coatings for RMPEAs, enabling their implementation and significant efficiency benefits sooner. |
| format | Article |
| id | doaj-art-e9613b5a8d7543e29d7d4b325abf64a0 |
| institution | Kabale University |
| issn | 0264-1275 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Materials & Design |
| spelling | doaj-art-e9613b5a8d7543e29d7d4b325abf64a02025-02-02T05:26:40ZengElsevierMaterials & Design0264-12752025-03-01251113652Design of an alumina forming coating for Nb-base refractory alloysCollin S. Holgate0Carolina Frey1Melina A. Endsley2Akane Suzuki3Carlos G. Levi4Tresa M. Pollock5Materials Department, University of California, Santa Barbara CA 93106-5050, United States; Corresponding author.Materials Department, University of California, Santa Barbara CA 93106-5050, United StatesMaterials Department, University of California, Santa Barbara CA 93106-5050, United StatesGE Aerospace Research, One Research Circle, Niskayuna, NY 12309, United StatesMaterials Department, University of California, Santa Barbara CA 93106-5050, United StatesMaterials Department, University of California, Santa Barbara CA 93106-5050, United StatesRefractory multi-principal element alloys (RMPEAs) promise to significantly enhance gas turbine engine efficiency, but their poor oxidation performance inhibits their implementation. Alumina-forming bond coat alloys can provide oxidation protection, but discovering suitable chemistries remains a challenge. We employed a design methodology that screens for alumina-formation capability using Al activity and phase constitution predictions from CalPhaD (Thermo-Calc). Alloy down-selection from approximately 7,800 alloys in the Nb-Si-Ti-Al-Hf system was conducted via analysis of calculated thermodynamic properties with number-density topology style maps. This approach is validated by creating and testing the composition Nb12Si23Ti24Al36Hf5, which forms protective alumina scales up to 1400 °C and resists pesting at 800 °C. Further, the alloy has an average coefficient of thermal expansion of ∼10.1 ppm/K, making it well matched to Nb-based refractory alloys. The methodology will be useful for the design of coatings for RMPEAs, enabling their implementation and significant efficiency benefits sooner.http://www.sciencedirect.com/science/article/pii/S0264127525000723Bond coatAluminaRefractory alloyOxidation |
| spellingShingle | Collin S. Holgate Carolina Frey Melina A. Endsley Akane Suzuki Carlos G. Levi Tresa M. Pollock Design of an alumina forming coating for Nb-base refractory alloys Materials & Design Bond coat Alumina Refractory alloy Oxidation |
| title | Design of an alumina forming coating for Nb-base refractory alloys |
| title_full | Design of an alumina forming coating for Nb-base refractory alloys |
| title_fullStr | Design of an alumina forming coating for Nb-base refractory alloys |
| title_full_unstemmed | Design of an alumina forming coating for Nb-base refractory alloys |
| title_short | Design of an alumina forming coating for Nb-base refractory alloys |
| title_sort | design of an alumina forming coating for nb base refractory alloys |
| topic | Bond coat Alumina Refractory alloy Oxidation |
| url | http://www.sciencedirect.com/science/article/pii/S0264127525000723 |
| work_keys_str_mv | AT collinsholgate designofanaluminaformingcoatingfornbbaserefractoryalloys AT carolinafrey designofanaluminaformingcoatingfornbbaserefractoryalloys AT melinaaendsley designofanaluminaformingcoatingfornbbaserefractoryalloys AT akanesuzuki designofanaluminaformingcoatingfornbbaserefractoryalloys AT carlosglevi designofanaluminaformingcoatingfornbbaserefractoryalloys AT tresampollock designofanaluminaformingcoatingfornbbaserefractoryalloys |