添加剂铜对等离子喷涂WC-12Co涂层摩擦磨损性能的影响研究.docx

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Title: The Effect of Copper Additive on Friction and Wear Properties of WC-12Co Coatings Deposited by Plasma Spraying
Abstract:
The aim of this study is to investigate the influence of copper additive on the friction and wear performance of WC-12Co coatings deposited by plasma spraying. The WC-12Co coatings were prepared with different copper content, and their structural, mechanical, and tribological properties were evaluated. The results show that the addition of copper significantly affects the microstructure, hardness, and wear resistance of the coatings. An optimal copper content was identified for improved tribological performance. Further analysis and discussion are presented in this paper.
1. Introduction
WC-12Co coatings have been widely used in industrial applications due to their excellent wear resistance and high hardness. However, in some high-temperature and high-stress environments, the performance of the coating can be further improved. The addition of certain elements as alloying agents can modify the microstructure and properties of the WC-12Co coating. Copper has been recognized as a potential additive to enhance the performance of the WC-12Co coating. This study aims to investigate the effect of copper additive on the friction and wear properties of WC-12Co coatings deposited by plasma spraying.
2. Experimental Methods
Coating Preparation
WC-12Co coatings with different copper contents (0 wt.%, 1 wt.%, 3 wt.%, and 5 wt.%) were prepared by plasma spraying. The coatings were deposited on a steel substrate and characterized for their microstructure, composition, and mechanical properties.
Microstructure Analysis
The microstructure of the coatings was examined using scanning electron microscopy (SEM) to observe the distribution and morphology of the WC particles, the presence of additional phases, and any potential defects.
Mechanical Testing
The hardness of the coatings was measured using Vickers microhardness testing. The adhesion strength was evaluated using a scratch test. The influence of copper content on the mechanical properties of the WC-12Co coatings was analyzed.
Tribological Testing
Friction and wear tests were conducted using a ball-on-disk tribometer under dry sliding conditions. The coefficients of friction and wear rates were measured and compared for coatings with different copper contents.
3. Results and Discussion
Microstructure Analysis
The microstructure analysis revealed that the addition of copper influenced the dispersion and size distribution of the WC particles. It was observed that the copper additive promoted the growth of certain WC grains, resulting in a more uniform microstructure with increased phase stability.
Mechanical Properties
The hardness of the WC-12Co coatings increased with the addition of copper, reaching a maximum at 3 wt.% copper content. At higher copper contents, a decrease in hardness was observed. The scratch test results showed that the adhesion strength of the coatings also improved with the addition of copper.
Tribological Performance
The tribological tests indicated that the addition of copper significantly affected the friction and wear behavior of the WC-12Co coatings. Coatings with 3 wt.% copper content exhibited the lowest coefficient of friction and wear rate, indicating improved wear resistance.
4. Conclusion
In this study, the influence of copper additive on the friction and wear properties of WC-12Co coatings deposited by plasma spraying was investigated. The addition of copper modified the microstructure and mechanical properties of the coatings. An optimal copper content of 3 wt.% was identified to achieve improved friction and wear performance. These findings contribute to a better understanding of the role of copper as an additive in enhancing the tribological properties of WC-12Co coatings. Further research can focus on the exploration of other additives and their synergistic effects with copper to optimize the performance of the coatings.