| CAO Huijun,ZHANG Qiyu,ZHANG Tiangang,ZHEN Hao,ZHANG Zhiqiang.Effects of Y2O3 Content on Microstructure and Tribological Properties of WC-reinforced Ti-based Coatings on TC4 Surfaces[J],53(19):126-140 |
| Effects of Y2O3 Content on Microstructure and Tribological Properties of WC-reinforced Ti-based Coatings on TC4 Surfaces |
| Received:June 02, 2024 Revised:August 23, 2024 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2024.19.012 |
| KeyWord:laser cladding TC4 Y2O3 microstructure refining mechanism tribological property |
| Author | Institution |
| CAO Huijun |
Traffic Engineering Institute,Artificial Intelligence Application Technology Research Center, Xiamen City University, Fujian Xiamen , China |
| ZHANG Qiyu |
School of Aeronautical Engineering, Civil Aviation University of China, Tianjin , China |
| ZHANG Tiangang |
School of Aeronautical Engineering, Civil Aviation University of China, Tianjin , China |
| ZHEN Hao |
School of Aeronautical Engineering, Civil Aviation University of China, Tianjin , China |
| ZHANG Zhiqiang |
School of Aeronautical Engineering, Civil Aviation University of China, Tianjin , China |
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| Abstract: |
| To enhance the surface mechanical properties and extend the safe service life of aerospace TC4 alloy, a composite coating of TC4, Ni-MoS2, WC, and Y2O3 powders was prepared on the surface of TC4 alloy using laser cladding, which improved the microhardness and wear resistance of the substrate surface. This study investigated the effect of Y2O3 content on the microstructure, hardness, and tribological properties of the coating. Using a Laser TruDisk4002 laser under argon protection, wear-resistant composite coatings of TC4+Ni-MoS2+WC+xY2O3 (x = 0wt.%, 1wt.%, 2wt.%, 3wt.%, 4wt.%) were prepared on a TC4 alloy substrate. The coating was observed with a scanning electron microscope (SEM). Phase identification was conducted by X-ray diffraction (XRD), energy dispersive spectroscopy (EDS), electron backscatter diffraction (EBSD), and transmission electron microscopy (TEM). The microhardness distribution of the coating was studied with a Vickers microhardness tester. The friction and wear properties of the coating were tested with a dry friction tester, and the wear morphology was analyzed with a non-contact white light interferometer profilometer. Additionally, the coherent relationships between the phases in the coating were calculated according to the Bramfitt’s two-dimensional lattice misfit theory. Results showed that the 3wt.% Y2O3 coating exhibited the best forming quality. As the Y2O3 content increased, the coating thickness increased from 0.975 mm to 1.447 mm. The cladding layer mainly consisted of TiC, Ti2Ni, Ti2S, matrix β-Ti, and unmolten WC. The addition of Y2O3 did not change the types of phases formed in the coating. According to the Bramfitt |
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