DEVELOPING A TECHNOLOGY FOR PRODUCING TITANIUM ALLOYS WITH SOLUTION AND INTERMETALLIC HARDENING

Abstract

The principles of creating antifriction materials, whose the structural model corresponds to the molecular-mechanical theory and wear, are formulated, namely: ensuring solution and intermetallic mechanisms of strengthening the matrix (base); inclusion of solid lubricants in the composition. The use of dispersed particles (carbides, borides, nitrides, silicides, oxides, etc.) as a strengthening phase is not excluded.

A new class of “Ti-Al-Cu” alloys with solution [α-Ti (Al)] and intermetallic [Ti₂Cu] hardening for machine parts for structural purposes has been developed. The combination of solution and intermetallic strengthening mechanisms and the introduction of solid lubricants (e.g. MoS₂, WSe₂, etc.) suppress the seizure phenomena characteristic of titanium and its alloys, and, therefore, allow obtaining fundamentally new titanium alloys (“TiAl – Ti₂Cu – MoS₂”) with high tribotechnical properties.

The complex strengthening mechanism ensures the metallic contact between the matrix and solid particles, and therefore prevents the adhesive mass transfer during the frictional interaction of the friction pairs. The presence of solid lubricants forms secondary structures on the mating surfaces, which increase the wear resistance of the material and reduce the friction coefficient.

Optimal alloying, for example V and Mo, additional strengthening with refractory particles and improvement of the production technology make it possible to significantly improve the mechanical and antifriction properties of the base “Ti – Al -Cu” alloy.