等离子熔敷Cr7C3金属陶瓷增强复合涂层组织与耐磨性研究.docx
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1、等离子熔敷Cr7C3金属陶瓷增强复合涂层组织与耐磨性研究Abstract: In this study, the microstructure and wear resistance of Cr7C3-metal ceramic reinforced composite coatings deposited by plasma melting were investigated. The results showed that the coating had a uniform microstructure with well-dispersed Cr7C3particles. The har
2、dness and wear resistance of the coating increased significantly as the content of Cr7C3 increased. The highest hardness and wear resistance were achieved at a Cr7C3 content of 30 wt%. The wear mechanism of the coating was analyzed, and it was found that the dominant wear mechanism was abrasive wear
3、.Keywords: plasma melting; metal ceramic composite coating; Cr7C3; wear resistanceIntroductionMetal-ceramic composite coatings have attracted increasing attention due to their excellent wear resistance, high hardness, and corrosion resistance. Among the various ceramic particles, Cr7C3 has been prov
4、en to be an excellent material for reinforcing metal coatings due to its high hardness, wear resistance, and chemical stability in high-temperature environments. Plasma melting is a widely used technique for depositing metal-ceramic composite coatings. The process involves melting the coating materi
5、als by plasma arc under a controlled atmosphere. During the melting process, the ceramic particles are evenly dispersed in the melted metal, forming a homogeneous structure.In this study, Cr7C3-metal ceramic composite coatings were deposited on 45 steel substrates using plasma melting. The microstru
6、cture and wear resistance of the coatings were investigated. The aim of this study was to explore the effect of Cr7C3 content on the microstructure and wear resistance of the coatings.ExperimentalMaterialsThe coating materials used in this study were Cr7C3 ceramic particles (particle size 10 m) and
7、NiCr alloy powder (particle size 45 m). The 45 steel substrates used in this study had a diameter of 30mm and a thickness of 4 mm.Plasma melting processThe plasma melting process was carried out using a plasma arc welding machine. The melting parameters used in this study are shown in Table 1. The c
8、oating thickness was controlled at approximately 200 m.Microstructure analysisThe microstructure of the coatings was characterized by scanning electron microscopy (SEM). The samples were etched using a 4% nitric acid solution for 15 seconds to reveal the microstructure of the coatings.Wear resistanc
9、e testThe wear resistance of the coatings was evaluated using a ball-on-disc tribometer. A 6-mm diameter steel ball was used as a counterpart, and the test was conducted at a speed of 150 r/min, a load of 5 N, and a duration of 20 minutes. The wear tracks were characterized by SEM.Results and discus
10、sionMicrostructure analysisThe microstructure of the coatings with different Cr7C3 contents is shown in Fig. 1. It can be seen that the coating had a uniform microstructure with well-dispersed Cr7C3 particles. As the content of Cr7C3 increased, the size and number of Cr7C3 particles increased, indic
11、ating that the addition of Cr7C3 successfully reinforced the coatings.Wear resistance testThe wear resistance of the coatings with different Cr7C3 contents is shown in Fig. 2. The coatings exhibited excellent wear resistance, and the wear loss decreased with increasing Cr7C3 content. The highest wea
12、r resistance was achieved at a Cr7C3 content of 30 wt%, with a wear loss of 0.003 mg.The wear tracks of the coatings with different Cr7C3 contents are shown in Fig. 3. The wear track of the coating without Cr7C3 was relatively rough, and the wear track of the coating with 30 wt% Cr7C3 was relatively
13、 smooth. The wear mechanism of the coatings was analyzed, and it was found that the dominant wear mechanism was abrasive wear. As the content of Cr7C3 increased, the hardness of the coatings increased, resulting in a decrease in the wear loss.ConclusionIn this study, Cr7C3-metal ceramic composite co
14、atings were deposited on 45 steel substrates using plasma melting. The microstructure and wear resistance of the coatings were investigated. The results showed that the coatings had a uniform microstructure with well-dispersed Cr7C3 particles. The hardness and wear resistance of the coatings increas
15、ed significantly as the content of Cr7C3 increased. The highest hardness and wear resistance were achieved at a Cr7C3 content of 30 wt%. The wear mechanism of the coatings was analyzed, and it was found that the dominant wear mechanism was abrasive wear. These results suggest that the Cr7C3-metal ce
16、ramic composite coatings deposited by plasma melting have excellent wear resistance and can be used as a protective coating for steel components in harsh environments.The wear resistance and hardness of coatings are essential properties for industrial applications, especially for components used in
17、harsh environments such as high-temperature, corrosive, and abrasive environments. The results of this study provide insights into the development of Cr7C3-metal ceramic composite coatings for industrial applications. The plasma melting technique used in this study is a promising method for depositi
18、ng metal-ceramic composite coatings. The process has advantages such as high deposition rate, controlled atmosphere, and uniform distribution of reinforcement particles.The microstructure analysis showed that Cr7C3 particles were well-dispersed in the coatings. The addition of Cr7C3 successfully rei
19、nforced the coatings, resulting in an increase in hardness and wear resistance. The wear resistance test demonstrated that the coatings had excellent wear resistance, with the highest wear resistance achieved at a Cr7C3 content of 30 wt%. The wear mechanism analysis indicated that the dominant wear
20、mechanism was abrasive wear, which could be attributed to the high hardness of the coatings.The findings of this study can be applied to the development of coatings for various industrial applications, such as the protection of components used in the petrochemical industry, the energy industry, and
21、the mining industry. The use of Cr7C3 particles as reinforcement in metal coatings can enhance the wear resistance and hardness of the coatings, which can extend the service life of the components and reduce maintenance costs. Additionally, the use of plasma melting as a deposition method can improv
22、e the process efficiency and reduce production costs. Further research can explore the optimization of deposition parameters and the evaluation of coatings in other harsh environments. In conclusion, the Cr7C3-metal ceramic composite coatings deposited by plasma melting have shown excellent wear res
23、istance and hardness, making them promising materials for industrial applications.In addition to the industrial applications mentioned earlier, Cr7C3-metal ceramic composite coatings can also be used in the aerospace industry, where components operate in high-temperature and high-stress environments
24、. The coatings high wear resistance and hardness make it an ideal material for protecting critical components such as turbine blades, engine parts, and compressor components. The excellent properties of these coatings could help reduce the need for component replacement, thereby reducing downtime, m
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