Microstructure and Wear Resistance of Si-TC4 Composite Coatings by High-Speed Wire-Powder Laser Cladding
The hardness and wear resistance of the surface of TC4 titanium alloy, which is widely used in aerospace and other fields, need to be improved urgently. Considering the economy, environmental friendliness, and high efficiency, Si-reinforced Ti-based composite coatings were deposited on the TC4 surfa...
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author | Boxuan Men Shenzhen Sun Chunyang Hu Qi Zhang Bin Han |
author_facet | Boxuan Men Shenzhen Sun Chunyang Hu Qi Zhang Bin Han |
author_sort | Boxuan Men |
collection | DOAJ |
description | The hardness and wear resistance of the surface of TC4 titanium alloy, which is widely used in aerospace and other fields, need to be improved urgently. Considering the economy, environmental friendliness, and high efficiency, Si-reinforced Ti-based composite coatings were deposited on the TC4 surface by the high-speed wire-powder laser cladding method, which combines the paraxial feeding of TC4 wires with the coaxial feeding of Si powders. The microstructures and wear resistance of the coatings were analyzed using X-ray diffraction (XRD), scanning electron microscopy (SEM), Vickers hardness tester, and friction and wear tester. The results indicate that the primary composition of the coating consisted of α-Ti and Ti<sub>5</sub>Si<sub>3</sub>. The microstructure of the coating underwent a notable transformation process from dendritic to petal, bar, and block shapes as the powder feeding speed increased. The hardness of the composite coatings increased with the increasing Si powder feeding rate, and the average hardness of the composite coating was 909HV<sub>0.2</sub> when the feeding rate reached 13.53 g/min. The enhancement of the microhardness of the coatings can be attributed primarily to the reinforcing effect of the second phase generated by Ti<sub>5</sub>Si<sub>3</sub> in various forms within the coatings. As the powder feeding speed increased, the wear resistance initially improved before deteriorating. The optimal wear resistance of the coating was achieved at a powder feeding rate of 6.88 g/min (wear loss of 2.55 mg and friction coefficient of 0.12). The main wear mechanism for coatings was abrasive wear. |
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spelling | doaj.art-465a3f4c4cc946559a5e6d6b598a0e722024-03-12T16:49:22ZengMDPI AGMaterials1996-19442024-02-01175112610.3390/ma17051126Microstructure and Wear Resistance of Si-TC4 Composite Coatings by High-Speed Wire-Powder Laser CladdingBoxuan Men0Shenzhen Sun1Chunyang Hu2Qi Zhang3Bin Han4School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao 266580, ChinaAnhui Jianghuai Automobile Group LTD Technical Center, Hefei 230022, ChinaSchool of Materials Science and Engineering, China University of Petroleum (East China), Qingdao 266580, ChinaSchool of Materials Science and Engineering, China University of Petroleum (East China), Qingdao 266580, ChinaSchool of Materials Science and Engineering, China University of Petroleum (East China), Qingdao 266580, ChinaThe hardness and wear resistance of the surface of TC4 titanium alloy, which is widely used in aerospace and other fields, need to be improved urgently. Considering the economy, environmental friendliness, and high efficiency, Si-reinforced Ti-based composite coatings were deposited on the TC4 surface by the high-speed wire-powder laser cladding method, which combines the paraxial feeding of TC4 wires with the coaxial feeding of Si powders. The microstructures and wear resistance of the coatings were analyzed using X-ray diffraction (XRD), scanning electron microscopy (SEM), Vickers hardness tester, and friction and wear tester. The results indicate that the primary composition of the coating consisted of α-Ti and Ti<sub>5</sub>Si<sub>3</sub>. The microstructure of the coating underwent a notable transformation process from dendritic to petal, bar, and block shapes as the powder feeding speed increased. The hardness of the composite coatings increased with the increasing Si powder feeding rate, and the average hardness of the composite coating was 909HV<sub>0.2</sub> when the feeding rate reached 13.53 g/min. The enhancement of the microhardness of the coatings can be attributed primarily to the reinforcing effect of the second phase generated by Ti<sub>5</sub>Si<sub>3</sub> in various forms within the coatings. As the powder feeding speed increased, the wear resistance initially improved before deteriorating. The optimal wear resistance of the coating was achieved at a powder feeding rate of 6.88 g/min (wear loss of 2.55 mg and friction coefficient of 0.12). The main wear mechanism for coatings was abrasive wear.https://www.mdpi.com/1996-1944/17/5/1126high-speed wire-powder laser claddingSi-TC4 composite coatingsmicrostructurewear resistance |
spellingShingle | Boxuan Men Shenzhen Sun Chunyang Hu Qi Zhang Bin Han Microstructure and Wear Resistance of Si-TC4 Composite Coatings by High-Speed Wire-Powder Laser Cladding Materials high-speed wire-powder laser cladding Si-TC4 composite coatings microstructure wear resistance |
title | Microstructure and Wear Resistance of Si-TC4 Composite Coatings by High-Speed Wire-Powder Laser Cladding |
title_full | Microstructure and Wear Resistance of Si-TC4 Composite Coatings by High-Speed Wire-Powder Laser Cladding |
title_fullStr | Microstructure and Wear Resistance of Si-TC4 Composite Coatings by High-Speed Wire-Powder Laser Cladding |
title_full_unstemmed | Microstructure and Wear Resistance of Si-TC4 Composite Coatings by High-Speed Wire-Powder Laser Cladding |
title_short | Microstructure and Wear Resistance of Si-TC4 Composite Coatings by High-Speed Wire-Powder Laser Cladding |
title_sort | microstructure and wear resistance of si tc4 composite coatings by high speed wire powder laser cladding |
topic | high-speed wire-powder laser cladding Si-TC4 composite coatings microstructure wear resistance |
url | https://www.mdpi.com/1996-1944/17/5/1126 |
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