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Difficulties in the controllable preparation of monolithic coatings by atmospheric plasma spraying process

  • Categories:Industry News
  • Author:Plasma cleaning machine-CRF plasma plasma equipment-plasma surface treatment machine manufacturer-chengfeng intelligent manufacturing
  • Origin:
  • Time of issue:2022-02-01
  • Views:

(Summary description)Difficulties in the controllable preparation of monolithic coatings by atmospheric plasma spraying process: Atmospheric plasma spraying technology is a commonly used coating preparation process. As the structural unit of the prepared coating, the morphology and stacking behavior of the monolithic layer determine the microstructure of the coating, which has a significant impact on the performance of the coating. The main factors related to the physical and chemical state of the droplet itself, the guest factors related to the substrate on which the coating is deposited, and the environmental factors affect the formation process of the monolithic layer. A variety of different influences and the correlation between them, and through the comparison of their characteristics, the future development direction that is closer to the real production conditions is proposed. With the continuous development of industrial technology, the requirements for the comprehensive performance of components are getting higher and higher, and the importance of surface engineering has become increasingly prominent. Preparing functional thin layers with a thickness of several micrometers to several millimeters on the surface of parts can change the surface properties of parts, greatly improve their performance, and effectively prolong their service life, which is in line with the requirements of green, circular economy and sustainable development. Thermal spraying is an important part of surface engineering. The spraying process is constantly evolving, the online monitoring and control technology of the spraying process is also developing rapidly, and the types of spraying materials are also expanding, forming a complete industrial system including equipment, raw materials, processes and applications. Atmospheric isomonic spraying (APS) is a kind of thermal spraying technology, which is characterized by high-temperature and high-speed plasma jet as the heat source, and has unique advantages in the preparation of ceramic coatings. In the atmospheric plasma spraying process, the powder particles are sent by the carrier gas into the high-temperature and high-speed plasma flame, heated and accelerated, hit the substrate in a molten or semi-molten state at high speed, spread rapidly, cool and solidify, and finally form a flat A large number of monolithic layers are continuously stacked to form a macro-scale coating. The characteristic unit of the atmospheric plasma sprayed coating, the morphology of the monolithic layer and the stacking behavior between the monolithic layers determine the microstructure of the coating. The monolithic layer is the structural unit of the coating prepared by thermal spraying, and its characteristics are closely related to the macroscopic properties of the coating. The difficulty in the controllable preparation of coatings by the atmospheric plasma spraying process is that there are many factors that need to be controlled in the process, and they often affect each other. The characteristics of high temperature, high speed, and wide distribution of physical and chemical states of droplets also bring great challenges to real-time observation and process control. The formation of the monolayer in the atmospheric plasma spraying process is mainly controlled by the cooling ability of the droplet. When the droplet cooling rate is fast, the fluidity of the liquid material decreases rapidly, and tends to form a disc-shaped monolithic layer; otherwise, it has a strong tendency to sputter. A closely related difference in coating performance brought about by the change in the monolithic profile is that the bond between the disc-shaped monolithic layer and the substrate is stronger, while the bond between the sputtered monolithic layer and the substrate is relatively strong. lower. More reliable in-situ temperature and velocity monitoring, especially temperature and velocity measurement that can track individual droplets, is undoubtedly a direct and effective method to study the effect of process parameters on the characteristics of monolithic layers. It is also an important direction for future development to digitize the morphology characteristics of the monolithic layer and establish a (semi-)quantitative relationship between it and the overall performance of the coating.

Difficulties in the controllable preparation of monolithic coatings by atmospheric plasma spraying process

(Summary description)Difficulties in the controllable preparation of monolithic coatings by atmospheric plasma spraying process:
Atmospheric plasma spraying technology is a commonly used coating preparation process. As the structural unit of the prepared coating, the morphology and stacking behavior of the monolithic layer determine the microstructure of the coating, which has a significant impact on the performance of the coating.
The main factors related to the physical and chemical state of the droplet itself, the guest factors related to the substrate on which the coating is deposited, and the environmental factors affect the formation process of the monolithic layer. A variety of different influences and the correlation between them, and through the comparison of their characteristics, the future development direction that is closer to the real production conditions is proposed.
With the continuous development of industrial technology, the requirements for the comprehensive performance of components are getting higher and higher, and the importance of surface engineering has become increasingly prominent. Preparing functional thin layers with a thickness of several micrometers to several millimeters on the surface of parts can change the surface properties of parts, greatly improve their performance, and effectively prolong their service life, which is in line with the requirements of green, circular economy and sustainable development.
Thermal spraying is an important part of surface engineering. The spraying process is constantly evolving, the online monitoring and control technology of the spraying process is also developing rapidly, and the types of spraying materials are also expanding, forming a complete industrial system including equipment, raw materials, processes and applications. Atmospheric isomonic spraying (APS) is a kind of thermal spraying technology, which is characterized by high-temperature and high-speed plasma jet as the heat source, and has unique advantages in the preparation of ceramic coatings.
In the atmospheric plasma spraying process, the powder particles are sent by the carrier gas into the high-temperature and high-speed plasma flame, heated and accelerated, hit the substrate in a molten or semi-molten state at high speed, spread rapidly, cool and solidify, and finally form a flat A large number of monolithic layers are continuously stacked to form a macro-scale coating. The characteristic unit of the atmospheric plasma sprayed coating, the morphology of the monolithic layer and the stacking behavior between the monolithic layers determine the microstructure of the coating. The monolithic layer is the structural unit of the coating prepared by thermal spraying, and its characteristics are closely related to the macroscopic properties of the coating.
The difficulty in the controllable preparation of coatings by the atmospheric plasma spraying process is that there are many factors that need to be controlled in the process, and they often affect each other. The characteristics of high temperature, high speed, and wide distribution of physical and chemical states of droplets also bring great challenges to real-time observation and process control. The formation of the monolayer in the atmospheric plasma spraying process is mainly controlled by the cooling ability of the droplet. When the droplet cooling rate is fast, the fluidity of the liquid material decreases rapidly, and tends to form a disc-shaped monolithic layer; otherwise, it has a strong tendency to sputter.
A closely related difference in coating performance brought about by the change in the monolithic profile is that the bond between the disc-shaped monolithic layer and the substrate is stronger, while the bond between the sputtered monolithic layer and the substrate is relatively strong. lower. More reliable in-situ temperature and velocity monitoring, especially temperature and velocity measurement that can track individual droplets, is undoubtedly a direct and effective method to study the effect of process parameters on the characteristics of monolithic layers. It is also an important direction for future development to digitize the morphology characteristics of the monolithic layer and establish a (semi-)quantitative relationship between it and the overall performance of the coating.

  • Categories:Industry News
  • Author:Plasma cleaning machine-CRF plasma plasma equipment-plasma surface treatment machine manufacturer-chengfeng intelligent manufacturing
  • Origin:
  • Time of issue:2022-02-01 15:26
  • Views:
Information

Difficulties in the controllable preparation of monolithic coatings by atmospheric plasma spraying process:
Atmospheric plasma spraying technology is a commonly used coating preparation process. As the structural unit of the prepared coating, the morphology and stacking behavior of the monolithic layer determine the microstructure of the coating, which has a significant impact on the performance of the coating.

The main factors related to the physical and chemical state of the droplet itself, the guest factors related to the substrate on which the coating is deposited, and the environmental factors affect the formation process of the monolithic layer. A variety of different influences and the correlation between them, and through the comparison of their characteristics, the future development direction that is closer to the real production conditions is proposed.
With the continuous development of industrial technology, the requirements for the comprehensive performance of components are getting higher and higher, and the importance of surface engineering has become increasingly prominent. Preparing functional thin layers with a thickness of several micrometers to several millimeters on the surface of parts can change the surface properties of parts, greatly improve their performance, and effectively prolong their service life, which is in line with the requirements of green, circular economy and sustainable development.
Thermal spraying is an important part of surface engineering. The spraying process is constantly evolving, the online monitoring and control technology of the spraying process is also developing rapidly, and the types of spraying materials are also expanding, forming a complete industrial system including equipment, raw materials, processes and applications. Atmospheric isomonic spraying (APS) is a kind of thermal spraying technology, which is characterized by high-temperature and high-speed plasma jet as the heat source, and has unique advantages in the preparation of ceramic coatings.
In the atmospheric plasma spraying process, the powder particles are sent by the carrier gas into the high-temperature and high-speed plasma flame, heated and accelerated, hit the substrate in a molten or semi-molten state at high speed, spread rapidly, cool and solidify, and finally form a flat A large number of monolithic layers are continuously stacked to form a macro-scale coating. The characteristic unit of the atmospheric plasma sprayed coating, the morphology of the monolithic layer and the stacking behavior between the monolithic layers determine the microstructure of the coating. The monolithic layer is the structural unit of the coating prepared by thermal spraying, and its characteristics are closely related to the macroscopic properties of the coating.
The difficulty in the controllable preparation of coatings by the atmospheric plasma spraying process is that there are many factors that need to be controlled in the process, and they often affect each other. The characteristics of high temperature, high speed, and wide distribution of physical and chemical states of droplets also bring great challenges to real-time observation and process control. The formation of the monolayer in the atmospheric plasma spraying process is mainly controlled by the cooling ability of the droplet. When the droplet cooling rate is fast, the fluidity of the liquid material decreases rapidly, and tends to form a disc-shaped monolithic layer; otherwise, it has a strong tendency to sputter.
A closely related difference in coating performance brought about by the change in the monolithic profile is that the bond between the disc-shaped monolithic layer and the substrate is stronger, while the bond between the sputtered monolithic layer and the substrate is relatively strong. lower. More reliable in-situ temperature and velocity monitoring, especially temperature and velocity measurement that can track individual droplets, is undoubtedly a direct and effective method to study the effect of process parameters on the characteristics of monolithic layers. It is also an important direction for future development to digitize the morphology characteristics of the monolithic layer and establish a (semi-)quantitative relationship between it and the overall performance of the coating.

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