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Technologies

Metalvar new has been developing metallisation technology for over thirty years.
Would you like to ennoble a mechanic component? Metalvar new has the right solution for your needs.

 

Metallization, better known as thermal spraying, is the cold coating technology in which there is always a flame under different shapes.
Coating materials are usually metals or ceramics in the form of wires or powders.

These ones, after being brought to a temperature which is very close to the melting point, are violently projected on to a surface on which coating will form, layer by layer.
Necessary conditions to achieve the metallization process success are the presence of a source of heat or thermal energy combined with a great kinetic energy.

Coating material is submerged into the thermal source where, as well as reaching an advanced plastic state, is subjected to an accelaration given by the combustion energy.

Particles, charged of kinetic energy, violently crash into the component to be coated, fastening to it in a plastic way and loosing instantly all of their heat.

This is exactly the most peculiar feature of thermal spraying. Using this technology it is possible to ennoble a workpiece without warming it, avoiding therefore problems that may be caused by deformation or physical changes of base material.

The wide range of products to which the metallization process is applicable combined to the fact that coatings do not damage the underlayer, allow this application to cover the most varied conditions to which a workpiece can be submitted.

Aps

Flame wire

Hvof

Spray & fuse

Arc wire

Slurry

Fluoropolymer coating

Here following a description of the main fields of use and the most widespread application technologies.

Cold zinking and ceramic coatings

Corrosion is a natural and irreversible process that literally wears out the involved material.
Metallization exploits the oppurtunity to coat materials that are able to create a barrier against corrosion.
One of the most common applications is cold zinking through which it is possible to take advantage of the zinc passivation properties to prevent rust.
Other examples of coatings that can resist to more severe corrosive events, for instance acidic environments, are aluminium oxide, chromium carbides and stellite.

Wear – Ceramic, molybdenum wires and other types of coatings

Wear is the progressive loss of material from one or from both surfaces that are in contact and in motion among themselves.
The main cause of wear is friction.
Through thermal spraying it is possible to perform coating on surfaces that are submitted to wear, hardening them and increasing therefore their useful life.
Among the most employed coatings against this phenomenon ceramic treatments, chromium and tungsten carbide coatings, stellite and molybdenum wire coatings can be included.

Dimensional restoration: thermal spraying, turning and grinding of workpieces

As everybody knows, lots of mechanical components wear out through use and time.
Thermal spraying, thanks to its capability not to deform base material, is employed to restore initial dimensions of the component, often using the base material itself. Coating, after spraying, can be submitted to a turning, grinding and a potential lapping phase according to drawing.

Thermal barriers: metallization technology for insulating coatings

High and continuous heat, together with sudden thermal changes, represent situations that put a strain on specific mechanical components.
Suffice it to think to the operating conditions of an aeronautic engine or of a gas turbine.
Metallization allows to perform coatings characterized by marked insulating properties, such as TBC Thermal Barrier Coatings. They are performed through plasma technology exploiting YSZ Yttria-stabilized Zirconia powders qualities.

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