Abstract
The mechanical properties (microhardness and scratch test) of AlSi coatings made by PVD magnetron sputtering method from alloys with 7-20%Si were compared. Higher concentration of Si increased deformation resistance of the coating, expressed by depth of scratch. Improved mechanical properties had coatings from alloys modified by TiBAl refiner.
Highlights
A relationship between the silicon concentration in AlSi alloy PVD coatings and their susceptibility to deformations under loading has been found in the study
Coatings fabricated from AlSi alloys modified by the TiBAl refiner are characterized by a hardening as expressed by an increase in HV0.01 hardness by approx. 10%, and a smaller scratch depth Pd by 3÷6%, compared to coatings made from unmodified alloys
„The X-ray measurement of the thermal expansibility of Al-Si alloy in the form of cast and a protective coating on steel”
Summary
The mechanical properties (microhardness and scratch test) of AlSi coatings made by PVD magnetron sputtering method from alloys with 7-20%Si were compared. The tendency of Si to crystallizing from liquids in the form large and acute-angled crystals causes the risk of breaking the continuity of coatings to occur during the press forming of parts, as well as during their bonding. This urges the manufacturers to look for technological solutions for the application of coatings on finished products among the PVD techniques. Having in mind the different susceptibility of Al i Si to sputtering, as well as the varying thermal expansion of the phases (αAl and Si) [7] already in the coating, the effect of phase refining (by modification with the TiBAl refiner) in the sputtered alloys on the mechanical properties of coating was determined in the study
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