Tungsten Carbide Coating Hardness

Wc 12co thermal spray coatings are usually harder compared to coatings of wc 17co as a result of higher tungsten carbide levels in the coating.

Tungsten carbide coating hardness. Wc is a chemical compound specifically a carbide containing equal parts of tungsten and carbon atoms. 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 hardness range 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. Microhardness values for the tungsten carbide coating are on the order of 1050 dph 300 diamond pyramid hardness compared with values of 750 to 850 dph that are typ ical of hard chrome plate.

Carbide coatings are typically used for wear resistance to abrasion erosion galling and fretting. Tungsten carbide measures 90 on the rockwell c scale which approaches the hardness and durability of natural diamonds. Tungsten carbide materials are recommended for wear applications with service temperatures of less than 500 degrees celsius as higher temperatures will result in the formation of brittle phases that reduce wear resistance and coating integrity. 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.

Tungsten carbide is the most versatile and widely used of our hvof applied coatings. Tungsten carbide chemical formula. Hardness of hvof tungsten carbide coatings is greater than 70 rc rock well scale compared with typical values of 60 to 70 rc for hard chrome plating. Most standard wear resistant alloys contain a maximum of 35 by volume of softer chromium carbide.

In both coating methods the wolfram tungsten carbide powder is sprayed on the surface of the work element as plastic and clings onto the previously sprayed base component. Hvof tungsten carbide coatings material properties. 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. Most carbide coatings are applied by hvof to achieve the densest and most well bonded coatings available by thermal spray.

The tungsten carbide wc 12co coatings are resistant to sliding wear impact abrasion and fretting at temperatures up to 510 c 950 f preferably in non corrosive media. Tungsten carbide is a chemical carbide containing equal parts of tungsten and carbon atoms. A wolfram carbide hard metal coating is either carried out with self fluxing powder flame spraying according to din en iso 14920 1999 or with hvof high speed flame spraying.