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The following article was published in our article directory on June 16, 2016.
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Article Category: Business
Author Name: Chuck Donald
Metal-to-metal contact, erosion, abrasion, oxidation, corrosion, and impact all lead to one thing � wear. Wear happens when materials from a surface are removed and deformed as a result of mechanical action from an opposing surface. This can take place when a surface comes in contact with nonmetallic solids, metals, solid particles or liquid droplets in flowing gases or flowing liquids.
Wear can shorten the life of materials exposed to certain levels of mechanical stress. This is where wear resistant coatings come into play. These coatings can provide toughness to various industrial machineries that would otherwise prematurely fail when subjected to factors that lead to wear.
Application of Wear Resistant Coatings
Wear resistant coatings are applied via flame spraying, which is a kind of thermal spray coating process that produces surface coatings through heat. The combustion of a fuel gas (usually acetylene or propane) with oxygen is used to produce this heat, which subsequently melts the spray coating material. This process heats and deposits onto a substrate -- a consumable, typically a powder or a wire -- to form a surface coating.
The coating material used has a lower melting point than its metallic substrate. The resultant surface coating is normally porous, thus enabling lubricants to be absorbed in the coating and consequently improving the performance of the material.
The benefits of using flame spraying to apply coatings are its cost effectivity and workability. This process requires manual spraying in a less demanding environment. The utilization of this thermal spraying process also enables the spraying of various ceramic or metallic coatings onto a wide assortment of component materials. These component materials, such as those found in agricultural harvesting components, oil drilling parts, infrastructure, aerospace, and machine repair, require excellent wear and impact resistance and improved performance amidst severe conditions.
Tungsten Carbide: An Excellent Hard Metal for Wear Resistant Coatings
Tungsten carbide is a composite material that is composed of equal amounts of tungsten and carbon atoms. This hard metal is very much favored for materials that must withstand very tough conditions such as abrasion, erosion, corrosion, and metal-to-metal contact. Its unique properties, such as its high impact strength and fatigue resistance, provide the hard metal its capability to resist several kinds of stress.
Tungsten carbide is a very effective material for wear resistant coatings. This hard metal has outstandingly high hardness levels, with a maximum hardness of 74 HRC. This specific property is particularly important in tungsten carbide�s abrasion resistance, although this alone does not necessarily dictate the effectivity of the hard metal when it comes to its ability to withstand wear.
The aforementioned hard metal is also very resistant to temperatures up to 650�C or 1200�F. This temperature resistance permits more efficient machining, and is the reason why tungsten carbide is usually found in high-speed drill bits. This kind of carbide is also corrosion-resistant, which means that it is not vulnerable to leaching when exposed to a strong acidic or basic solution.
Tungsten carbide�s hardness and abrasion, temperature, and corrosion resistance enable the hard metal to be a preferred material in coatings that are resistant to wear. It provides durability where other materials have become ruined too early.
Keywords: teflon,teflon coatings,tungsten carbide,wear resistant coatings,non stick
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