Academic Journal
Microstructural characterization and evolution under high temperature oxidation of CoCrAlYTa-10%Al2O3 coating deposited by high-velocity oxygen fuel thermal spraying
| العنوان: | Microstructural characterization and evolution under high temperature oxidation of CoCrAlYTa-10%Al2O3 coating deposited by high-velocity oxygen fuel thermal spraying |
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| المؤلفون: | Wei Shi, Yuping Wu, Sheng Hong, Weihua Yang, Zheng Wei |
| المصدر: | Materials Research Express, Vol 7, Iss 1, p 016435 (2020) |
| بيانات النشر: | IOP Publishing |
| سنة النشر: | 2020 |
| المجموعة: | Directory of Open Access Journals: DOAJ Articles |
| مصطلحات موضوعية: | HVOF thermal spraying, CoCrAlYTa-10%Al2O3 coating, microstructure, oxidation, microhardness, Materials of engineering and construction. Mechanics of materials, TA401-492, Chemical technology, TP1-1185 |
| الوصف: | The CoCrAlYTa-10%Al _2 O _3 coating was fabricated on H13 steel substrate using high-velocity oxygen fuel (HVOF) thermal spraying. A detail characterization on the microstructures, element distribution and phase composition of the HVOF sprayed CoCrAlYTa-10%Al _2 O _3 coating was conducted using scanning electron microscopy (SEM) equipped with energy-dispersive spectroscopy (EDS), x-ray diffraction (XRD) and transmission electron microscopy (TEM). The microstructural evolution and microhardness of the coating at different temperatures were investigated. The results showed that the coating had a dense and uniform microstructure with a low porosity of 0.44%. The primary phases for the CoCrAlYTa-10%Al _2 O _3 coating were identified as Co-based solid solution, Cr-based solid solution, Al _2 O _3 phase and TaC particles. Compounds such as Cr _7 C _3 , Al _13 Co _4 and aluminum-yttrium oxides Al _5 Y _3 O _12 were also confirmed by TEM observation results. Owing to the rapidly cooling rates of the molten droplets, nano-crystalline phase was existed in the coating. The average microhardness of the coating was 640 HV _0.1 . Its high microhardness derived from the presence of certain volume fraction of hard Al _2 O _3 , Cr _7 C _3 and TaC grains within the coating. After 1h of oxidation, oxides like CrO _2 and Ta _2 O _5 were formed when the coating exposed at the temperature up to 800 °C. At the temperature above 600 °C, the hardness of the coating remained at a high level (600 HV _0.1 ). It possessed better high temperature softening resistance than H13 steel, indicated that the coating exhibited good mechanical properties at high temperature. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| تدمد: | 2053-1591 |
| Relation: | https://doi.org/10.1088/2053-1591/ab69d0; https://doaj.org/toc/2053-1591; https://doaj.org/article/9719294d563f407d8da19c885ce3edf6 |
| DOI: | 10.1088/2053-1591/ab69d0 |
| الاتاحة: | https://doi.org/10.1088/2053-1591/ab69d0 https://doaj.org/article/9719294d563f407d8da19c885ce3edf6 |
| رقم الانضمام: | edsbas.84B44371 |
| قاعدة البيانات: | BASE |
Full Text Finder | تدمد: | 20531591 |
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| DOI: | 10.1088/2053-1591/ab69d0 |