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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Main Authors: Boxuan Men, Shenzhen Sun, Chunyang Hu, Qi Zhang, Bin Han
Format: Article
Language:English
Published: MDPI AG 2024-02-01
Series:Materials
Subjects:
Online Access:https://www.mdpi.com/1996-1944/17/5/1126
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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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AT shenzhensun microstructureandwearresistanceofsitc4compositecoatingsbyhighspeedwirepowderlasercladding
AT chunyanghu microstructureandwearresistanceofsitc4compositecoatingsbyhighspeedwirepowderlasercladding
AT qizhang microstructureandwearresistanceofsitc4compositecoatingsbyhighspeedwirepowderlasercladding
AT binhan microstructureandwearresistanceofsitc4compositecoatingsbyhighspeedwirepowderlasercladding