COVER 9L1540 - Caterpillar

Table 5
Metco 452 Nickel-Iron Aluminum Composite Powder
Summary Designed to produce coatings with excellent self-bonding properties and to provide a significant improvement in merchantability, wear, and oxidation resistance. Coatings are dense and can be used for oxidation resistance up to 815° C (1500° F).
Composition 52% Iron
38% Nickel
10% Aluminum
Particle Size -120 mesh +15 microns (-125 +15 microns)
Deposit Efficiency 85%
Powder Required for 0.25 mm (0.010 in) thickness 1.98 kg/m2 (6.500 ounce/ft2)
Spray Rate 6.81 kg/hr (15.000 lb/hr)
Bond Strength Bond strengths are 27.6 MPa (4000 psi) Metco 452 does not reliably self-bond to copper, high copper alloys, molybdenum, or tungsten metals.
Thickness Limitation -
Surface Preparation Coating is self-bonding. Clean the substrate and remove any surface oxides. Preheat to prevent formation of condensation.
Spraying Follow recommended spraying parameters. Magnesium surfaces should never be preheated because the surface oxidizes too rapidly. Oxidation interferes with bond strength. Indirectly preheat aluminum surfaces at 64° - 95°C (150° - 200°F) to eliminate the formation of surface oxides (preheat back or side, but never on the surface to be sprayed). Oven preheating is not recommended because the surface to be sprayed is heated directly. If indirect preheat cannot be performed, then the substrate should not be preheated.
Finishing Best finish is achieved by machining using standard carbide tools.
Table 6
Metco 453 Iron Nickel-Aluminum Composite Powder
Summary Powder designed to produce coatings with improved finishing properties. Coatings can be ground to a fine finish. Metco 453 produces extremely tough coatings from an exothermic nature of aluminum with iron to enhance self-bonding. Aluminum enhances resistance to oxidation, while molybdenum enhances high temperature scuff resistance.
Composition 55% Iron
35% Nickel
5% Molybdenum
5% Aluminum
Particle Size -120 + 325 mesh (-117 +44 microns)
Maximum Service Temperature 815° C (1500° F)
Deposit Efficiency 90%
Powder Required for 0.25 mm (0.010 in) thickness 1.6 kg/m2 (5.28 ounce/ft2)
Spray Rate 6.8 kg/hr (15.00 lb/hr)
Bond Strength Coatings exhibit strengths greater than 31.1 MPa (4500.00 psi) on flat ground surfaces and 37.9 MPa (5500.00 psi) on Mecolite C grit blasted steel surfaces.
Thickness Limitation Thickness limitations on ground CRS flats range 1.0 - 1.5 mm (0.04 - 0.06 in) on blasted surfaces.
Spraying Follow recommended spraying parameters. Spray rate and distance are important parameters. Excessively high spray rates or spraying too close may result in low deposit efficiencies, excess free aluminum, excessive oxides, poor finish, entrapped particles, and poor cohesive bonding.
Finishing Grinding: Best finish is achieved by grinding. Ground finishes are obtained using 60 grit silicon carbide wheels. Dry grinding is recommended over wet grinding. Final grinding operations should include belt grinding with a 325 or 400 grit SiC belt to obtain 0.1-0.4 microns Ra (5.00-15.00 microinch Ra) surface finish. Aluminum oxide wheels may be used. Wheels should be dressed more frequently when using aluminum oxide.
Machining: Coatings may be machined dry with tungsten carbide tool bits (883 grade carboloy or equivalent). High surface feeds or cuts may be used at the expense of increased tool bit wear. Refinish bits before making final machine cut. Links to Equipment Information and Suppliers
Reference: CaterpillarRepair Process Engineering Metal Restoration
https://dealer.cat.com/en/ps/service/rpe/c/metal-restoration.html
Reference: 3Mwww.3m.com
Reference: Torit Productswww2.donaldson.com/torit
Reference: