Hvof Tungsten Carbide Coating Hardness

Hi usually in thermal spray applications they use to measure macrohardness that is only as reference value only to have an idea of the hardness of the coating and this value for wc17 co is about 65 to 72 hrc it depend of the system or parameters been used to obtain this values you must use an hvof system.

Hvof tungsten carbide coating hardness.

In 1988 sulzer metco introduced its first hvof coating solutions with a new line of spray equipment and materials. Two tungsten carbide powders with co matrix tab 1 and two tungsten carbide powders with co cr matrix fujimi incorporated japan were sprayed utilizing the hvaf m3 process uniquecoat us and the hvof jp5000 praxair. Most standard wear resistant alloys contain a maximum of 35 by volume of softer chromium carbide. Uniform high hardness and ductility low stress and porosity lead to a substantial increase of service life of parts protected with kermetico hvaf wc co coatings in comparison with hvof tungsten carbide versions.

Tungsten carbide coating is done through a process known as high velocity oxygen fuel spraying hvof. Tungsten carbide chemical formula. Hvof tungsten carbide coatings are often applied to roll surfaces used in paper production. In its most basic form tungsten carbide is a fine gray powder but it can be pressed and formed into shapes through a process called sintering for use in industrial machinery cutting tools abrasives armor piercing shells and jewellery.

Ehc reference was introduced in. Tungsten carbide is a chemical carbide containing equal parts of tungsten and carbon atoms. In these challenging environments erosion abrasion and corrosion are some of the most common issues. Most kermetico guns are good to spray wc 12co coatings.

A 12 tungsten carbide cobalt coating will have a typical micro hardness of 1100 to 1350 dph300. Tungsten carbide with a vickers number of 1700 2400 85 hrc equivalent is composed of 90 carbide particles by weight 80 by volume. Tungsten carbide s hardness level is comparable with corundum and can only be polished and finished with abrasives of superior hardness such as cubic boron nitride and diamond powder wheels and. Wc is a chemical compound specifically a carbide containing equal parts of tungsten and carbon atoms.

Domex355 steel substrates were sprayed to a targeted coating thickness of 380 microns. Thus tungsten carbide coatings and ceramic coatings are particularly effective in conditions of extreme wear. When choosing a tungsten carbide powder the particle size and type of carbide selected are important in determining the correct material to combat various forms of erosion abrasion and wear whereas the amount of metal matrix in the coating nickel cobalt or alloy will depend on the. It is by far the most preferred method of coating owing to the many benefits it presents.

Wear resistant thermal spray coatings of tungsten carbide are used for their hardness and wear resistance. This tungsten carbide coating process involves the use of combustive thermal spray at high velocity to develop exceptional wear and corrosion resistance.