{"title":"镍基超级合金 (IN738LC) 上通过反应空气镀铝法沉积的两种不同铝化物涂层在 1000 °C 的等温氧化性能","authors":"Shayan Sarraf, Mansour Soltanieh, Saeed Rastegari","doi":"10.1016/j.jallcom.2024.178123","DOIUrl":null,"url":null,"abstract":"This study examines the isothermal oxidation behavior of two aluminide coatings on IN738LC substrates, deposited via reactive air aluminizing (RAA) based on the standard heat treatment procedure of the substrate and subjected to 1000 °C in the air for 100<!-- --> <!-- -->hours. Characterization techniques, including FE-SEM, SEM, X-ray diffraction, Raman spectroscopy, and EDS analysis, revealed that the aluminide coatings exhibited a high-activity three-layer microstructure influenced by deposition temperature and duration. High-temperature coatings (1120 °C) exhibited a classic interdiffusion zone (IDZ) structure and α-Al<sub>2</sub>O<sub>3</sub> scale, while lower-temperature coatings (845 °C) displayed an unusual IDZ and γ-Al<sub>2</sub>O<sub>3</sub> scale. Oxidation kinetics showed a parabolic weight gain trend, with high-temperature coatings demonstrating approximately 100 times lower oxidation rates than low-temperature ones, indicating superior resistance. An incomplete transformation from γ to α alumina was identified in the lower-temperature coatings post-oxidation. Coating degradation was primarily due to inward aluminum diffusion, worsened in lower-temperature coatings, lacking a diffusion barrier IDZ layer. Remarkably, both coating types maintained their initial phases without forming NiO or NiAl<sub>2</sub>O<sub>4</sub> during oxidation. These findings underscore the critical influence of the RAA deposition temperature on the oxidation resistance and microstructural stability of aluminide coatings.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"30 1","pages":""},"PeriodicalIF":5.8000,"publicationDate":"2024-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Isothermal Oxidation Performance at 1000 °C of Two Different Aluminide Coatings Deposited by the Reactive Air Aluminizing Method on a Nickel-Based Superalloy (IN738LC)\",\"authors\":\"Shayan Sarraf, Mansour Soltanieh, Saeed Rastegari\",\"doi\":\"10.1016/j.jallcom.2024.178123\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"This study examines the isothermal oxidation behavior of two aluminide coatings on IN738LC substrates, deposited via reactive air aluminizing (RAA) based on the standard heat treatment procedure of the substrate and subjected to 1000 °C in the air for 100<!-- --> <!-- -->hours. Characterization techniques, including FE-SEM, SEM, X-ray diffraction, Raman spectroscopy, and EDS analysis, revealed that the aluminide coatings exhibited a high-activity three-layer microstructure influenced by deposition temperature and duration. High-temperature coatings (1120 °C) exhibited a classic interdiffusion zone (IDZ) structure and α-Al<sub>2</sub>O<sub>3</sub> scale, while lower-temperature coatings (845 °C) displayed an unusual IDZ and γ-Al<sub>2</sub>O<sub>3</sub> scale. Oxidation kinetics showed a parabolic weight gain trend, with high-temperature coatings demonstrating approximately 100 times lower oxidation rates than low-temperature ones, indicating superior resistance. An incomplete transformation from γ to α alumina was identified in the lower-temperature coatings post-oxidation. Coating degradation was primarily due to inward aluminum diffusion, worsened in lower-temperature coatings, lacking a diffusion barrier IDZ layer. Remarkably, both coating types maintained their initial phases without forming NiO or NiAl<sub>2</sub>O<sub>4</sub> during oxidation. These findings underscore the critical influence of the RAA deposition temperature on the oxidation resistance and microstructural stability of aluminide coatings.\",\"PeriodicalId\":344,\"journal\":{\"name\":\"Journal of Alloys and Compounds\",\"volume\":\"30 1\",\"pages\":\"\"},\"PeriodicalIF\":5.8000,\"publicationDate\":\"2024-12-17\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Alloys and Compounds\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://doi.org/10.1016/j.jallcom.2024.178123\",\"RegionNum\":2,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"CHEMISTRY, PHYSICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Alloys and Compounds","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1016/j.jallcom.2024.178123","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
Isothermal Oxidation Performance at 1000 °C of Two Different Aluminide Coatings Deposited by the Reactive Air Aluminizing Method on a Nickel-Based Superalloy (IN738LC)
This study examines the isothermal oxidation behavior of two aluminide coatings on IN738LC substrates, deposited via reactive air aluminizing (RAA) based on the standard heat treatment procedure of the substrate and subjected to 1000 °C in the air for 100 hours. Characterization techniques, including FE-SEM, SEM, X-ray diffraction, Raman spectroscopy, and EDS analysis, revealed that the aluminide coatings exhibited a high-activity three-layer microstructure influenced by deposition temperature and duration. High-temperature coatings (1120 °C) exhibited a classic interdiffusion zone (IDZ) structure and α-Al2O3 scale, while lower-temperature coatings (845 °C) displayed an unusual IDZ and γ-Al2O3 scale. Oxidation kinetics showed a parabolic weight gain trend, with high-temperature coatings demonstrating approximately 100 times lower oxidation rates than low-temperature ones, indicating superior resistance. An incomplete transformation from γ to α alumina was identified in the lower-temperature coatings post-oxidation. Coating degradation was primarily due to inward aluminum diffusion, worsened in lower-temperature coatings, lacking a diffusion barrier IDZ layer. Remarkably, both coating types maintained their initial phases without forming NiO or NiAl2O4 during oxidation. These findings underscore the critical influence of the RAA deposition temperature on the oxidation resistance and microstructural stability of aluminide coatings.
期刊介绍:
The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.