Flame spraying, also known as thermal spraying, is a technique in which a coating is locally applied to a component in order to improve its operational performance. Revamo employs metals and alloys, such as ceramics, tungsten carbides, chromium carbides, stellites, etc. (in wire or powder form) to carry out this work. Even seemingly contradictory properties can be combined with flame spraying.
Revamo is able to apply more than 100 different flame sprayed layers to various materials. Each layer has its own unique properties which means flame spraying can be used in many different applications.
Flame spraying causes no, or hardly any, structural changes and/or deformation of the components that are subjected to these processes. As a result, the processes can be carried out local and with precision.
Autogenous wire spraying process
In this process, we melt a metal wire in a gas/oxygen flame and spray it using compressed air. The flame temperature is between 2,800 to 3,200ºC. This allows us to apply different metals and alloys. We often use this process for corrosion protection and repair purposes.
Autogenous powder spraying process
Using this process, we can spray metals, alloys and metallic compounds. The material is in powder-form and is melted and sprayed in a gas/oxygen flame that can reach 3,200°C. This means, for example, that we can spray alloy coatings such as nickel-chromium and tungsten carbide (the cobalt alloys).
Electric wire-arc spraying process
This process uses an electric arc to create a temperature of approximately 4,000°C between two metal wires. The spraying occurs with compressed air. This technique delivers a micro-porous lamellar layer with good adhesion and high yield. We mostly use this process for repair purposes.
In a gas/oxygen flame with a temperature of approximately 3,000°C, materials such as tungsten carbides can be bombarded onto the work piece with a particle velocity of more than 1,000 meters per second. This forms a very dense and uniform layer with high adhesion strength.
With this process, we melt material in powder form by heating it in ionised gas using an electric arc. The high heat and conductivity of this 'plasma flame' (16,000°C) provide the optimal conditions for strength, adhesion, uniformity and purity of the sprayed layer. The high particle velocity also contributes to this. Because of the high temperatures there are hardly any restrictions to the materials that can be sprayed. Examples include ceramics such as chromium and aluminium oxides.
Low pressure cold spray
This process is carried out under low temperature, but the work piece is bombarded with particles at high speed (up to 600m/s). This forms a very dense and uniform layer. The work piece never gets too hot to touch and this results in zero deformation. This process enables us to economically carry out "spot" repairs.
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