Tungsten is a wolframite metallic chemical element that is believed to have a very high adhesive power. On the other hand, carbide is a carbon alloy consisting of a semiconductor with a cohesive ability. A blend of the two chemical components forms a highly adhesive and cohesive, wear resistance coating to vexing, erosion and fretting. The tungsten carbide coatings are majorly applied by thermal sprays to achieve the densest and most well-bounded coatings.
Several techniques which include: thermal and plasma sprays are employed to get the opted coating texture which primarily depends on the application procedures used. A further coating operation is usually used which is aimed for secondary and tertiary fusibility purposes to produce a stronger metallic luster. It thus portrays appealing results and facilitates consistency in application.
The critical process ordains by combusting fuel gas and mixing it with oxygen gas which is then subjected to high pressure to generate a high velocity through increasing the kinetic energy. The mixture of gases is then strictly injected through a narrowed nozzle. At the nozzle point, it is mixed with the tungsten carbide feedstock powder where it jets out at an accelerating velocity.
The speeding mixture of the powder and the gases impart terrific amounts of the motion energy, including the kinetic energy on the on the injected powder particles. This makes the energetic particles to strike the surface making the velocity to yield zero and also the adoption of the kinetic energy which makes them cling instantly to the workpiece in question. This results in the formation of a very dense, cohesive and adhesive coating. Therefore, low porosity and a high bond strength coating are realized.
Some critical instances demand a specified coating texture. It is thus achieved through mixing the carbide powder with the selected binder material containing the desired characteristics. The resulting compound manifest increased hardness due to its higher boiling point. It is thus sprayed by a high-velocity oxygen thermal spray resulting in the formation of a hard and resistant to corrosion coating.
The binder material and chemical technique selected determines the resulting coating characteristics and its ability to curb irritating processes like corrosion, erosion, and abrasion in drastic wear conditions. Through the above technique, it renders it applicable in various industries processes like in paper production where the desired paper output is solely determined by the nature of the rolling surface.
Similarly, the coating is applicable in power generation mostly where coal is the chief fuel source. This is because the component surfaces must be keenly protected from extreme cases of gouging like an abrasion. Also, the coating is also widely used in steel and metal products throughout the entire process. It thus accrues a benefit in that it dramatically manifests reduced maintenance costs and advanced production quality.
The introduction of these coatings has accrued tantamount benefits in the engineering community. It has led to operational and maintenance cost reduction in the cases of entirely solid plants that involved combustion chambers in their production. Therefore, it has led to obsolesce of other coating methods like hard chromium coatings which are characterized by undesirable attributes.
Several techniques which include: thermal and plasma sprays are employed to get the opted coating texture which primarily depends on the application procedures used. A further coating operation is usually used which is aimed for secondary and tertiary fusibility purposes to produce a stronger metallic luster. It thus portrays appealing results and facilitates consistency in application.
The critical process ordains by combusting fuel gas and mixing it with oxygen gas which is then subjected to high pressure to generate a high velocity through increasing the kinetic energy. The mixture of gases is then strictly injected through a narrowed nozzle. At the nozzle point, it is mixed with the tungsten carbide feedstock powder where it jets out at an accelerating velocity.
The speeding mixture of the powder and the gases impart terrific amounts of the motion energy, including the kinetic energy on the on the injected powder particles. This makes the energetic particles to strike the surface making the velocity to yield zero and also the adoption of the kinetic energy which makes them cling instantly to the workpiece in question. This results in the formation of a very dense, cohesive and adhesive coating. Therefore, low porosity and a high bond strength coating are realized.
Some critical instances demand a specified coating texture. It is thus achieved through mixing the carbide powder with the selected binder material containing the desired characteristics. The resulting compound manifest increased hardness due to its higher boiling point. It is thus sprayed by a high-velocity oxygen thermal spray resulting in the formation of a hard and resistant to corrosion coating.
The binder material and chemical technique selected determines the resulting coating characteristics and its ability to curb irritating processes like corrosion, erosion, and abrasion in drastic wear conditions. Through the above technique, it renders it applicable in various industries processes like in paper production where the desired paper output is solely determined by the nature of the rolling surface.
Similarly, the coating is applicable in power generation mostly where coal is the chief fuel source. This is because the component surfaces must be keenly protected from extreme cases of gouging like an abrasion. Also, the coating is also widely used in steel and metal products throughout the entire process. It thus accrues a benefit in that it dramatically manifests reduced maintenance costs and advanced production quality.
The introduction of these coatings has accrued tantamount benefits in the engineering community. It has led to operational and maintenance cost reduction in the cases of entirely solid plants that involved combustion chambers in their production. Therefore, it has led to obsolesce of other coating methods like hard chromium coatings which are characterized by undesirable attributes.
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