CONTROL OF FRICTION PROPERTIES IN POLYAMIDE COATINGS IN TENSION JOINTS

Mechanical engineering
Authors:
Kushchenko Aleksandra K. Albert Ya. Bashkarev
Abstract:

Tension joints are used to transfer twisting moments and axial loads due to friction forces, which occur on contacting surfaces as a result of their elastic deformation created by tension in assembly. During operation, joints made of steel elements deteriorate due to fretting corrosion caused by alternating loads, common for many types of machines and equipment. One of the ways to fight this condition is to apply thin-layer polymer coatings. The paper presents the results of research in adhesion strength and the static coefficient of friction of a thin-layer polyamide coating and polyamide-based composites on steel. It is revealed that the best friction and adhesion properties are demonstrated by a polyamide composite with 20-40% of mass fraction of red iron oxide. Its static coefficient of friction on steel is comparable to the static coefficient of friction of steel on steel while adhesion to a steel surface on failure is 40% higher than that of a pure polyamide coating.