Metal components are meant to be used or operated in different environments. Some of those environments are very harsh in that they have very high temperatures, are very corrosive, or are very reactive among other conditions. Such environments are able to cause very severe effects when they come in contact with metal components, which may lead to a significant reduction in durability, aesthetic value, and functionality among others. To curb the effects of such environments, diffusion coatings were invented.
The process through which a diffusion coating is applied on a metal component is referred to with the same name, diffusion coating. The process takes place in environments with very high temperatures inside a controlled chamber. This process involves activating various metals such as cobalt, nickel, and iron thermally. During the process, the metal component that needs to be coated is cleaned using various methods such as abrasive blasting to remove all kinds of external materials that may affect bond formation with the coating.
Once the substrate has been cleaned properly, it is placed into a contained together with the metal used for coating. The container is then placed inside a furnace or a chamber. The furnace is turned on and the temperature set to the range of 380-425 degrees centigrade.
When certain temperatures are attained within the aforementioned range, diffusion occurs to the metal. This makes it to make an alloy with the substrate. The nature of the substrate and the kind of metal used dictate how much time this process can last. However, most processes last from two hours to four hours. The substrate must be continuously turned throughout the process to achieve equal thickness.
The resultant coating is smooth and its thickness is very uniform. Depending on the function of a component, the thickness can be varied. However, the normal range of thicknesses is between 15-80 micrometers. The color of the metal used for coating forms the color of the component after coating. Chromium, iron, aluminium, and silicon are among the most commonly used metals. Coating can also be done to various metals too, including iron, steels, cobalt, and nickel.
The coating that results is capable of resisting erosion, oxidation, and reaction with substances like air and water. Metal components that are used for critical functions are made stronger, more durable, and more reliable. Gave valves, pump impellers, power generation components, and gas turbines engine constituents including vanes, blades, and cases are among the components that are coated this way.
The process is used mostly in industrial settings and few household equipment have components that are coated this way. The technology was invented several years ago and has been undergoing a lot of modifications aimed at perfecting it. Currently, there are better methods and technology for doing it.
Modern day furnaces have a lot of improvements in the form of features aimed at increasing efficiency and functionality. Today it is possible to achieve very thin coatings that are very strong and effective at eliminating corrosion. The automotive industry is particularly known for using this technology.
The process through which a diffusion coating is applied on a metal component is referred to with the same name, diffusion coating. The process takes place in environments with very high temperatures inside a controlled chamber. This process involves activating various metals such as cobalt, nickel, and iron thermally. During the process, the metal component that needs to be coated is cleaned using various methods such as abrasive blasting to remove all kinds of external materials that may affect bond formation with the coating.
Once the substrate has been cleaned properly, it is placed into a contained together with the metal used for coating. The container is then placed inside a furnace or a chamber. The furnace is turned on and the temperature set to the range of 380-425 degrees centigrade.
When certain temperatures are attained within the aforementioned range, diffusion occurs to the metal. This makes it to make an alloy with the substrate. The nature of the substrate and the kind of metal used dictate how much time this process can last. However, most processes last from two hours to four hours. The substrate must be continuously turned throughout the process to achieve equal thickness.
The resultant coating is smooth and its thickness is very uniform. Depending on the function of a component, the thickness can be varied. However, the normal range of thicknesses is between 15-80 micrometers. The color of the metal used for coating forms the color of the component after coating. Chromium, iron, aluminium, and silicon are among the most commonly used metals. Coating can also be done to various metals too, including iron, steels, cobalt, and nickel.
The coating that results is capable of resisting erosion, oxidation, and reaction with substances like air and water. Metal components that are used for critical functions are made stronger, more durable, and more reliable. Gave valves, pump impellers, power generation components, and gas turbines engine constituents including vanes, blades, and cases are among the components that are coated this way.
The process is used mostly in industrial settings and few household equipment have components that are coated this way. The technology was invented several years ago and has been undergoing a lot of modifications aimed at perfecting it. Currently, there are better methods and technology for doing it.
Modern day furnaces have a lot of improvements in the form of features aimed at increasing efficiency and functionality. Today it is possible to achieve very thin coatings that are very strong and effective at eliminating corrosion. The automotive industry is particularly known for using this technology.
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