Effect of Varying Plasma Powers on High-Temperature Applications of Plasma-Sprayed Al<sub>0.5</sub>CoCrFeNi<sub>2</sub>Ti<sub>0.5</sub> Coatings
In this work, the microstructure and mechanical properties of atmospheric plasma-sprayed coatings of Al<sub>0.5</sub>CoCrFeNi<sub>2</sub>Ti<sub>0.5,</sub> prepared using gas-atomized powders at varying spray powers, are studied in as-sprayed and heat-treated condi...
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MDPI AG
2022-10-01
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| Online Access: | https://www.mdpi.com/1996-1944/15/20/7198 |
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| author | Sammy Kiplangat Rotich Ngetich Gilbert Kipkirui Tzu-Tang Lin Shih-Hsun Chen |
| author_facet | Sammy Kiplangat Rotich Ngetich Gilbert Kipkirui Tzu-Tang Lin Shih-Hsun Chen |
| author_sort | Sammy Kiplangat Rotich |
| collection | DOAJ |
| description | In this work, the microstructure and mechanical properties of atmospheric plasma-sprayed coatings of Al<sub>0.5</sub>CoCrFeNi<sub>2</sub>Ti<sub>0.5,</sub> prepared using gas-atomized powders at varying spray powers, are studied in as-sprayed and heat-treated conditions. Gas-atomized powders had spherical shapes and uniform element distributions, with major FCC phases and metastable BCC phases. The metastable BCC phase transformed to ordered and disordered BCC phases when sufficient energy was applied during the plasma-spraying process. During the heat treatment process for 2 hrs, disordered BCCs transformed into ordered BCCs, while the intensity of the FCC peaks increased. Spraying power plays a significant role in the microstructure and mechanical properties of plasma sprayed because at a high power, coatings exhibit better mechanical properties due to their dense microstructures resulting in less defects. As the plasma current was increased from 500 A to 700 A, the coatings’ hardness increased by approximately 21%, which is directly proportional to the decreased wear rate of the coatings at high spraying powers. As the coatings experienced heat treatments, the coatings sprayed with a higher spraying power showed higher hardness and wear resistances. Precipitation strengthening played a significant role in the hardness and wear resistances of the coatings due to the addition of the titanium element. |
| first_indexed | 2024-03-09T19:53:32Z |
| format | Article |
| id | doaj.art-d6df6a534b7f4082b2b70ca180cfb459 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T19:53:32Z |
| publishDate | 2022-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-d6df6a534b7f4082b2b70ca180cfb4592023-11-24T01:03:49ZengMDPI AGMaterials1996-19442022-10-011520719810.3390/ma15207198Effect of Varying Plasma Powers on High-Temperature Applications of Plasma-Sprayed Al<sub>0.5</sub>CoCrFeNi<sub>2</sub>Ti<sub>0.5</sub> CoatingsSammy Kiplangat Rotich0Ngetich Gilbert Kipkirui1Tzu-Tang Lin2Shih-Hsun Chen3Department of Mechanical Engineering, National Taiwan University of Science and Technology, Taipei 10607, TaiwanDepartment of Mechanical Engineering, National Taiwan University of Science and Technology, Taipei 10607, TaiwanDepartment of Mechanical Engineering, National Taiwan University of Science and Technology, Taipei 10607, TaiwanDepartment of Mechanical Engineering, National Taiwan University of Science and Technology, Taipei 10607, TaiwanIn this work, the microstructure and mechanical properties of atmospheric plasma-sprayed coatings of Al<sub>0.5</sub>CoCrFeNi<sub>2</sub>Ti<sub>0.5,</sub> prepared using gas-atomized powders at varying spray powers, are studied in as-sprayed and heat-treated conditions. Gas-atomized powders had spherical shapes and uniform element distributions, with major FCC phases and metastable BCC phases. The metastable BCC phase transformed to ordered and disordered BCC phases when sufficient energy was applied during the plasma-spraying process. During the heat treatment process for 2 hrs, disordered BCCs transformed into ordered BCCs, while the intensity of the FCC peaks increased. Spraying power plays a significant role in the microstructure and mechanical properties of plasma sprayed because at a high power, coatings exhibit better mechanical properties due to their dense microstructures resulting in less defects. As the plasma current was increased from 500 A to 700 A, the coatings’ hardness increased by approximately 21%, which is directly proportional to the decreased wear rate of the coatings at high spraying powers. As the coatings experienced heat treatments, the coatings sprayed with a higher spraying power showed higher hardness and wear resistances. Precipitation strengthening played a significant role in the hardness and wear resistances of the coatings due to the addition of the titanium element.https://www.mdpi.com/1996-1944/15/20/7198HEAsAl<sub>0.5</sub>CoCrFeNi<sub>2</sub>Ti<sub>0.5</sub>atmospheric plasma sprayinggas atomizationwear resistanceprecipitation strengthening |
| spellingShingle | Sammy Kiplangat Rotich Ngetich Gilbert Kipkirui Tzu-Tang Lin Shih-Hsun Chen Effect of Varying Plasma Powers on High-Temperature Applications of Plasma-Sprayed Al<sub>0.5</sub>CoCrFeNi<sub>2</sub>Ti<sub>0.5</sub> Coatings Materials HEAs Al<sub>0.5</sub>CoCrFeNi<sub>2</sub>Ti<sub>0.5</sub> atmospheric plasma spraying gas atomization wear resistance precipitation strengthening |
| title | Effect of Varying Plasma Powers on High-Temperature Applications of Plasma-Sprayed Al<sub>0.5</sub>CoCrFeNi<sub>2</sub>Ti<sub>0.5</sub> Coatings |
| title_full | Effect of Varying Plasma Powers on High-Temperature Applications of Plasma-Sprayed Al<sub>0.5</sub>CoCrFeNi<sub>2</sub>Ti<sub>0.5</sub> Coatings |
| title_fullStr | Effect of Varying Plasma Powers on High-Temperature Applications of Plasma-Sprayed Al<sub>0.5</sub>CoCrFeNi<sub>2</sub>Ti<sub>0.5</sub> Coatings |
| title_full_unstemmed | Effect of Varying Plasma Powers on High-Temperature Applications of Plasma-Sprayed Al<sub>0.5</sub>CoCrFeNi<sub>2</sub>Ti<sub>0.5</sub> Coatings |
| title_short | Effect of Varying Plasma Powers on High-Temperature Applications of Plasma-Sprayed Al<sub>0.5</sub>CoCrFeNi<sub>2</sub>Ti<sub>0.5</sub> Coatings |
| title_sort | effect of varying plasma powers on high temperature applications of plasma sprayed al sub 0 5 sub cocrfeni sub 2 sub ti sub 0 5 sub coatings |
| topic | HEAs Al<sub>0.5</sub>CoCrFeNi<sub>2</sub>Ti<sub>0.5</sub> atmospheric plasma spraying gas atomization wear resistance precipitation strengthening |
| url | https://www.mdpi.com/1996-1944/15/20/7198 |
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