Preparation of Wear-Resistant Coating on Ti6Al4V Alloy by Cold Spraying and Plasma Electrolytic Oxidation
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials
2.2. Coatings Preparation and Process Parameters
2.3. Characterization Methods
3. Results and Discussion
3.1. The Cell Voltage–Time and Current Density–Time Responses during PEO Treatment
3.2. Morphology of Coatings
3.3. Phase Composition of Coatings
3.4. Micro Hardness of Coatings
3.5. Wear Test
3.5.1. Coefficients of Friction (COF)
3.5.2. Friction Morphology
3.5.3. Wear Rate
4. Conclusions
- (1)
- The PEO coating that formed on the Ti6Al4V alloy with CS-coating under soft sparking mode had a more compact structure, relatively higher α-Al2O3 content, and higher micro hardness than that formed under unipolar mode.
- (2)
- The PEO coating that formed on Ti6Al4V base alloy was mainly composed of TiO2 and contained cracks and pores.
- (3)
- Among all the samples, the PEO coating that formed on CS-coating under soft sparking mode exhibited the best wear resistance with a wear rate of 1.18 × 10−5 mm3/(Nm). The excellent wear resistance of the coating depended on the higher α-Al2O3 content and compact structure of the coating.
- (4)
- The investigations indicated that the combination of cold spraying and PEO under soft sparking mode is a promising technique for improving the wear resistance of titanium alloys. Further research is needed to reduce the COF of the PEO coating formed under soft sparking mode.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Al | V | O | Fe | Ti |
---|---|---|---|---|
5.5~6.9 | 3.5~4.5 | <0.2 | <0.4 | balance |
Sample Code | Mode | Time (s) | I+ (A) | I− (A) | (μs) | (μs) | (μs) | (μs) | Qp/Qn |
---|---|---|---|---|---|---|---|---|---|
S1 | Soft sparking | 1320 | 1.2 | 1.33 | 900 | 100 | 900 | 100 | 0.9 |
S2 | unipolar | 1320 | 1.2 | N/A | 900 | 1100 | N/A | N/A | ∞ |
Sample Code | Time (s) | U+ (V) | U− (V) | (μs) | (μs) | (μs) | |
---|---|---|---|---|---|---|---|
S3 | 1020 | 350 | 60 | 900 | 100 | 900 | 100 |
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Shao, M.; Wang, W.; Yang, H.; Zhang, X.; He, X. Preparation of Wear-Resistant Coating on Ti6Al4V Alloy by Cold Spraying and Plasma Electrolytic Oxidation. Coatings 2021, 11, 1288. https://doi.org/10.3390/coatings11111288
Shao M, Wang W, Yang H, Zhang X, He X. Preparation of Wear-Resistant Coating on Ti6Al4V Alloy by Cold Spraying and Plasma Electrolytic Oxidation. Coatings. 2021; 11(11):1288. https://doi.org/10.3390/coatings11111288
Chicago/Turabian StyleShao, Mingzeng, Wei Wang, Hongbo Yang, Xueer Zhang, and Xiaomei He. 2021. "Preparation of Wear-Resistant Coating on Ti6Al4V Alloy by Cold Spraying and Plasma Electrolytic Oxidation" Coatings 11, no. 11: 1288. https://doi.org/10.3390/coatings11111288