PROSPECTS OF IMPROVING THE TRIBOTECHNICAL CHARACTERISTICS OF TITANIUM COMPOSITES

Abstract

Titanium-based composites containing МoS₂, МoSe₂, CaF₂, and ВN solid lubricants are synthesized. Their tribological characteristics are investigated without lubrication at different sliding velocities (0.5, 1, 2, 4, 6, and 15 m/sec) and insignificant pressures (0.27, 0.54, 0.8, 1.1, 1.35, 1.47, and 2.7 MPa) in air. It is established that, in view of the high friction coefficient and large wear, the composite materials cannot be proposed as antifriction ones for operation at small sliding velocities and insignificant pressures. The titanium-based composites are promising as antifriction ones at an increased sliding velocity (15 m/s) and insignificant pressures; their friction coefficients range from 0.3 to 0.36, and their wear ranges from 1.91 to 68.3 mg/km. In friction without lubrication at a high sliding velocity in air, the temperature of their working surface increases resulting from the formation of titanium oxides and then a dense secondary lubricating microheterogeneous film. The composition and structure of the secondary films differ from those of the starting materials and determine their antifriction properties and friction performance.