Plasma Tungsten Carbide
A&A Coatings material is a fine grade tungsten carbide-cobalt aggregate powder for
plasma spray. It produces the best coatings for low temperature wear resistance of all
tungsten carbide powders. These coatings are recommended for resistance to wear by
abrasive grains, hard surfaces, fretting and particle erosion.
Material Powder Characteristics
| Typical Composition: | Cobalt 12% Tungsten Carbide Balance |
| NOTE: A&A can provide Tungsten Carbide coatings of many different compositions. Please inquire for more information. |
|
| Typical Size Range: | -325 mesh +15 microns -45 +15 microns |
| Melting Point: | 1260°C (2300°F) |
Physical Properties of Coating
| Surface Texture As-Sprayed (microinches aa): | 250-350 |
| Ground – 400 grit diamond (microinches aa): | 7-8 |
| Lapped (microinches aa): | 1-3 |
| Coating Macrohardness: | Rc50-55 |
| Density (g/cc): | 14.5 |
| Coating Weight (lb/ft2/.001″): | .075 |
| Porosity | Less than 2% |
| Bond Strength on Low Carbon Steel Substrate (PSI): | 6500 |
Thickness Limitation
A&A Coatings Plasma Sprayed Tungsten Carbide was designed for use in thin coatings,
not more than .5mm (.020″) thick. If sprayed thicker, the probability of cracking and
delamination will increase rapidly, as is the case of thick coatings of all fine powders.
Surface Preparation
A&A Coatings Plasma Sprayed Tungsten Carbide is self-bonding to mild steel and to
titanium which has been cleaned to remove surface oxides. This cleaning is accomplished
with a light grit blast. Preheating of titanium should be done with care, to prevent
reformation of surface oxides.
Finishing
A&A Coatings Plasma Sprayed Tungsten Carbide can be ground to required finish size
and polished to a five surface finish per physical properties of coating above.