Plasma Molybdenum-Nickel-Aluminum
A&A Coatings Molybdenum-Nickel-Aluminum composite powder. It was especially developed as a General Purpose material for producing medium hard coatings for hard bearing and wear resistance applications. This material offers two major advantages: “One-Step” spraying and High-Integrity coatings.
“One-Step” coatings offer these benefits:
- Eliminate the need for a separate bond coat.
- Less undercutting required. The allowance for bond coat thickness is eliminated.
- Less technique dependence. Reducing the number of steps required to produce the coating, also reduces the chance of error.
- More convenience. One-step coatings eliminate having to change materials and spraying parameters.This material was designed to produce moderately hard, low-shrink, high-strength coatings which are recommended for wear resistance, resistance to particle erosion, and for the salvage and build-up of both machinable and grindable carbon steels.Coatings of Molybdenum-Nickel-Aluminum are extremely tough, and exhibit good erosion resistance. They can withstand some impact without cracking. Flaking and chipping are minimized.These coatings can be ground to very fine finishes. Also, good machined finishes can be obtained with conditional technique.
Material Powder Characteristics
| Typical Composition: | Molybdenum 5% Aluminum 5.5% Nickel Balance |
| Typical Size Range: | -170 +325 microns |
| Melting Point: | 660°C (1215°F) |
Physical Properties of Coating
| Texture, as sprayed, (microinches aa): | 350 – 750 |
| Finish, machined dry (microinches aa): | 90 – 130 |
| Finish, machined wet (microinches aa): | 30 – 40 |
| Finish, ground (microinches aa): | 10 – 20 |
| Macrohardness: | Rb80 |
| Cross-Sectional Hardness (DPH300): | 200 |
| Density (g/cc): | 7.4 |
| Coating Weight (lb/ft2/.001″): | .039 |
| Bonding (low carbon steel substrate): | 7,000psi |
Thickness Limitation
There is no thickness limitation. Heavy buildup can be applied without cracking and without dependence or need for temperature control.
Surface Preparation
A&A Coatings Plasma Sprayed Molybdenum-Nickel-Aluminum can be applied to most substrates which have been cleaned to remove surface oxides. This cleaning is accomplished with a light grit blast. Additionally, a “Bond coat” is required in some cases. Please contact us for substrate specific requirements
Finishing
Grinding: Molybdenum-Nickel-Aluminum coatings are best finished by grinding. Excellent finishes can be obtained with both aluminum oxide and silicon carbide wheels. As these coatings are medium hard, wheel loading can occur unless relatively coarse grain, low-bond strength wheels are used.
Machining: These coatings are conditionally machinable with some degree of technique dependence. They can be machined with standard tungsten carbide tools, but the quality of finish and tool wear will vary considerably with the machining technique.