Microstructural characterization and evolution under high temperature oxidation of CoCrAlYTa-10%Al2O3 coating deposited by high-velocity oxygen fuel thermal spraying
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 scan...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2020-01-01
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| Series: | Materials Research Express |
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| Online Access: | https://doi.org/10.1088/2053-1591/ab69d0 |
| _version_ | 1827869510957268992 |
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| author | Wei Shi Yuping Wu Sheng Hong Weihua Yang Zheng Wei |
| author_facet | Wei Shi Yuping Wu Sheng Hong Weihua Yang Zheng Wei |
| author_sort | Wei Shi |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-12T15:45:15Z |
| format | Article |
| id | doaj.art-9719294d563f407d8da19c885ce3edf6 |
| institution | Directory Open Access Journal |
| issn | 2053-1591 |
| language | English |
| last_indexed | 2024-03-12T15:45:15Z |
| publishDate | 2020-01-01 |
| publisher | IOP Publishing |
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| series | Materials Research Express |
| spelling | doaj.art-9719294d563f407d8da19c885ce3edf62023-08-09T15:29:00ZengIOP PublishingMaterials Research Express2053-15912020-01-017101643510.1088/2053-1591/ab69d0Microstructural characterization and evolution under high temperature oxidation of CoCrAlYTa-10%Al2O3 coating deposited by high-velocity oxygen fuel thermal sprayingWei Shi0https://orcid.org/0000-0003-1654-9340Yuping Wu1Sheng Hong2Weihua Yang3Zheng Wei4https://orcid.org/0000-0003-1611-4291College of Mechanics and Materials, Hohai University , 8 Focheng west Road, Nanjing 211100, People’s Republic of ChinaCollege of Mechanics and Materials, Hohai University , 8 Focheng west Road, Nanjing 211100, People’s Republic of ChinaCollege of Mechanics and Materials, Hohai University , 8 Focheng west Road, Nanjing 211100, People’s Republic of ChinaCollege of Mechanics and Materials, Hohai University , 8 Focheng west Road, Nanjing 211100, People’s Republic of ChinaCollege of Mechanics and Materials, Hohai University , 8 Focheng west Road, Nanjing 211100, People’s Republic of ChinaThe 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.https://doi.org/10.1088/2053-1591/ab69d0HVOF thermal sprayingCoCrAlYTa-10%Al2O3 coatingmicrostructureoxidationmicrohardness |
| spellingShingle | Wei Shi Yuping Wu Sheng Hong Weihua Yang Zheng Wei Microstructural characterization and evolution under high temperature oxidation of CoCrAlYTa-10%Al2O3 coating deposited by high-velocity oxygen fuel thermal spraying Materials Research Express HVOF thermal spraying CoCrAlYTa-10%Al2O3 coating microstructure oxidation microhardness |
| title | Microstructural characterization and evolution under high temperature oxidation of CoCrAlYTa-10%Al2O3 coating deposited by high-velocity oxygen fuel thermal spraying |
| title_full | Microstructural characterization and evolution under high temperature oxidation of CoCrAlYTa-10%Al2O3 coating deposited by high-velocity oxygen fuel thermal spraying |
| title_fullStr | Microstructural characterization and evolution under high temperature oxidation of CoCrAlYTa-10%Al2O3 coating deposited by high-velocity oxygen fuel thermal spraying |
| title_full_unstemmed | Microstructural characterization and evolution under high temperature oxidation of CoCrAlYTa-10%Al2O3 coating deposited by high-velocity oxygen fuel thermal spraying |
| title_short | Microstructural characterization and evolution under high temperature oxidation of CoCrAlYTa-10%Al2O3 coating deposited by high-velocity oxygen fuel thermal spraying |
| title_sort | microstructural characterization and evolution under high temperature oxidation of cocralyta 10 al2o3 coating deposited by high velocity oxygen fuel thermal spraying |
| topic | HVOF thermal spraying CoCrAlYTa-10%Al2O3 coating microstructure oxidation microhardness |
| url | https://doi.org/10.1088/2053-1591/ab69d0 |
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