Volume 48, No 1, 2026, Pages 72-82
Download full text in PDFIncreasing the Wear Resistance of Titanium Alloys in Plain Bearings with Galvanic and Vacuum-Arc Coatings
Authors:
Tareq M.A. Al-Quraan 
,
Andrii Khimko ,
Margaryta Khimko ,
Oksana Mikosianchyk ,
Rudolf Mnatsakanov ,
Oleksandr Yakobchuk
DOI: 10.24874/ti.2043.10.25.11
Received: 16 September 2025
Revised: 11 October 2025
Accepted: 10 November 2025
Published: 15 March 2026
Abstract:
The aim of the work is to investigate the wear-resistant characteristics of galvanic and vacuum-arc coatings of molybdenum and chromium on X105CrMo17 steel and VT-22 titanium alloy under fretting conditions. The studies were conducted at 20 and 30 MPa, an oscillation frequency of 30 Hz, an amplitude of mutual displacement of the samples of 175 µm, and a number of cycles of 5 x 105. It was found that the vacuum-arc coating of hard chromium under a load of 20 MPa is characterized by wear resistance 2-3 times greater than that of the electrolytic coating: at 30 MPa, signs of seizure appear. High wear resistance of the molybdenum coating applied by the vacuum-arc method was established: at a pressure of 20 and 30 MPa, this coating on the VT-22 alloy is characterized by a decrease in linear wear by 2.6 and 1.2 times, compared to the coating on X105CrMo17 steel. The theoretical aspects of relaxation, hysteresis, and microplastic mechanisms of internal friction under fretting conditions are considered. The use of VT-22 alloy as an inner race with a 70-µm-thick molybdenum coating applied to its surface using a vacuum-arc method is recommended for spherical plain bearings in the aviation industry.
Keywords:
Titanium alloys, Wear-resistant coatings, Wear resistance, Fretting corrosion, Plain bearings
