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These processes allow to deposit some coatings in order to optimize the working and reliability of some mechanic components, when thermal processing (temper etc.), thermal chemical ones (cementation, nitridation, etc) or more traditional coatings look improper. This technology is often employed also to restore or repair strongly worn parts, without creating deformation and variation of structures of basic material. Thermal spray processes consist in a coating obtained from powders whose sizes vary between 1 and 500µm, wires, metallic sticks, ceramics or cermet (dispersion of ceramic phases in metallic matrix) which are heated in gas atmosphere at high temperature, close to fusion point and then accelerated, in gas emission, towards the substrate where they fast solidify giving place to superimposed lamellar structures (splats). Zocca Officine Meccaniche, since its foundation, has been protagonist of significant technological turns in this sector:
Coatings are made on simple and multi-complex geometrical parts by means of ABB robots endowed with absolute check on 7 axes and on completely automated plants. The best fitting coating for a mechanic part is chosen between a wide range of possible coatings according to whatever stress, strain, wear and corrosion the part is to undergo and by considering the contact surface characteristics of the antagonist component, such as hardness and geometrical shape, and even type and structure of materials. Zocca Officine Meccaniche realizes coatings having high superficial hardness, best adhesion, least porosity, regular structure, and final thickness and roughness carefully checked. These coatings characteristics allow to reach good results in wear resistance, control of corrosion produced by acid and basic liquids, high work temperatures, thermal shocks (even repeated) and, when required, best electric insulation. Present technologies in Zocca Officine Meccaniche:
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