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Jumat, 04 Desember 2015

Useful Facts About Diffusion Coatings

By Marci Nielsen


The operation and application of metal components is done in diverse environments. The variance in the environments is of great importance because some of the environments have diverse impacts on components. Corrosive environments and high temperatures for instance can be very damaging. Adverse environments impact functionality, longevity, and beauty of components. As such, in an attempt to reduce or eliminate the effects, diffusion coatings were invented. The purpose of these coatings is protecting substrates from being ruined by adverse environments. The information below discusses the process and how it offers protection to substrates.

The process of applying a diffusion coating on a metal substrate is called diffusion coating too. This process is done inside a chamber at temperatures that are very high. Various metals such as nickel, iron, and cobalt are activated thermally during the procedure. Before the process can start, the substrate needs to be cleaned thoroughly first. Cleaning can be done through various methods, but abrasive blasting is commonly used. Cleaning is for removing dirt and other undesirable materials from the surface of substrates.

After being properly cleaned, the substrate is placed in a special container, which is placed inside a furnace in turn. The furnace is sometimes called a chamber. The furnace operates at very high temperatures, which range between 380-425 degrees.

Diffusion of the metal occurs when temperatures rise high enough within the range specified. An alloy between the substrate and metal is formed in turn. The duration of the whole processes varies relying on the kind of metal and substrate used. However, 2-4 hours is the normal range. Continuous turning of substrates must be done for uniformed thickness to be attained.

The smoothness of the resultant coating is high while the thickness if uniform. Thicknesses can be varied to suit different functions. However, 15-80 micrometers is the normal range of thickness. The coating resembles the metal used in color. Iron, cobalt, chromium, aluminum, and silicon are some among the commonest metals in use. Various metals such as iron, steels, cobalt, and nickel can be coated.

The coating is resistant to erosion, oxidation, and reaction with air, water, and other substances. A lot of reliability, durability, and strength is achieved in components that are needed in critical functions. Pump impellers, power generation constituents, gave valves, and components or gas turbines engine like vanes, blades, and cases are examples of parts that usually get coated through this method.

This process is highly employed in industrial settings than it is applied in residential settings. In fact, very few equipment in homes need or have components coated this way. The process has been in use for long now, and since its invention, it has been modified severally. Modification are aimed at making it perfect in terms of the methods and technologies used.

Modern day furnaces are very efficient and have improved functionality because they incorporate several features. The coatings achieved today are thin yet very durable, strong, and efficient at avoiding corrosion. This technology is highly employed in the automotive industry.




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