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Gas or liquid combustion metallising
Wire flame spraying (WFS)
This process consists of introducing a zinc or zinc-aluminium wire into a spray gun fed with gas (propane or acetylene and oxygen). The wire across the gun is melted by gas combustion. It is then sprayed using compressed air onto the surface to be metallised.
Wires with larger diameter, generally starting at 3mm, are used for this type of spray gun.
Materials used:
- wires;
- bars;
- cords.
Fields of application:
- steel structures for anti-corrosion protection;
- gearbox fork;
- synchro ring;
- piston ring.
For more details: method and equipment
Powder flame spraying (PFS)
Powder flame spraying is a simple process of thermal spraying which uses the energy of a chemical reaction. A powder material is introduced at the centre of an oxy-fuel flame produced by a blowtorch. The powder is then sprayed at high speed due to kinetic energy transferred by combustion gases. With over 100 different materials, the range of coats to apply is thus very wide.
Materials used in powder form:
- metals;
- plastics.
Fields of application:
- rolling rolls;
- bearing rings;
- rotors;
- extrusion screws;
- steel structures for anti-corrosion protection.
For more details: method and equipment
Detonation gas spraying (DGS)
A detonation gun consists of a 25mm tube, one meter long, with a combustion chamber at its end. Powder is introduced at the same time as the combustion gas mixture (acetylene-oxygen) which detonates due to a spark. The shock wave thus created accelerates particle spraying. Particles going through a flame are thus molten and ejected at very high speed. This is a discontinuous system.
Materials used in powder form:
- pure metals;
- alloys;
- ceramic oxides;
- materials containing nickel;
- materials containing cobalt.
Fields of application:
- pump pistons;
- turbine rotors in steam turbines;
- medical engineering: implants;
- oil and gas industry: gas compressors;
- paper industry: calender rolls.
For more details: method and equipment
HVOF/HVAF powder spraying
A mixture of fuel-oxygen is continuously burned in a combustion chamber. Hydrogen, propylene, propane, methane and kerosene are used as fuels. Gas combustion will generate a high-pressure combustion reaction. The powder to be sprayed is introduced into the flame where it becomes molten and is then strongly accelerated. This process is thus used for producing high-density coatings with optimum adhesion.
Materials used in powder form:
- pure metals;
- alloys;
- carbides;
- ceramics;
- materials containing cobalt;
- materials containing nickel.
Fields of application:
- aviation: aircraft engines, landing gears, landing flaps;
- gas and oil industry: valves;
- building machinery: pistons, hydraulic cylinders;
- power plants: turbines.
For more details: method and equipment
ISO 2063 Standard
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