Plasma Chromium Carbide
A&A Coatings material is a mixture of crystalline chromium carbide and nickel chromium powders. It produces coatings for use in temperatures ranging from 540-815°C (1000-1500°F) to resist wear by abrasive grains, hard surfaces and fretting. It is also used as an abrasive coating in machine element clearance control applications.
Material Powder Characteristics
| Typical Composition: | Chromium Carbide 75% Nickel 20% Chromium 5% NOTE: A&A can provide Chromium Carbide coatings of many different compositions. Please inquire for more information. |
| Typical Size Range: | -140 mesh +10 microns -106 +10 microns |
| Melting Point: | 1400°C (2550°F) |
Physical Properties of Coating
| Surface Texture As-Sprayed (microinches aa): |
400-500 |
| Ground (microinches aa): | 30-40 |
| Ground (microinches aa): | 30-40 |
| Lapped (microinches aa): | 5-8 |
| Coating Macrohardness: | Rc39 |
| Density (g/cc): | 5.9 |
| Coating Weight (lb/ft2/.001″): | .031 |
| Porosity | Medium |
Thickness Limitation
A&A Coatings Plasma Sprayed Chromium Carbide was designed for use in thin coatings, not more than .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 Chromium 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
Finish by grinding with a 60 grit, green silicon carbide or diamond wheel, using standard wet grinding techniques. Machine finishing is not recommended. A very coarse finish would be expected.
