Abstract

The stress state of plasma sprayed amorphous coatings of the Fe-B based alloys with the boron content of 15-35 %, as well as of the above type alloys but with additions of Ni, Cr, Mo, was studied. Internal stresses depend on the type of a plasma gas, thickness and composition of the coatings, material, temperature and conditions of additional cooling of the substrate. Additional cooling of the substrate was found to be the most efficient method of decreasing the internal stress. Formation of compressive stresses in the coating layers adjoining the substrate is shown to lead to 25-30 % increase in its fatigue strength under alternating loads.

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