DEVELOPMENT OF A DISPERSED REINFORCED COMPOSITE MATERIAL AM4.5Kd-10%TiC WITH IMPROVED TRIBOLOGICAL CHARACTERISTICS

CLTFWQ

Abstract

Dispersed reinforced composite materials are distinguished by a unique combination of strength, hardness and wear resistance, which allows them to be classified as a group of promising structural materials. The article considers the results of reinforcement of the AM4.5Kd alloy by the method of self-propagating high-temperature synthesis with a titanium carbide phase in the amount of 10 wt.%. The possibility of formation in the melt of AM4.5Kd at a temperature of 900°C from industrial titanium and carbon black powders of micron-sized titanium carbide particles with sizes from 100 nm, as well as maintaining the level of dispersion is shown. The reinforcing phase and after the standard matrix alloy thermal treatment in the form of quenching at 545°C and aging at 170°C for 4 hours. By X-ray phase analysis, it was determined that the content of the carbide phase is at least 9 wt.%, and after heat treatment, an additional separation of the intermetallic θ-phase (Al2Cu) occurs in the amount of 2 wt.%. A complex of studies of physical, chemical, mechanical and tribological characteristics has been carried out. It was found that the resulting composite material, like the matrix alloy, retains high density, a sufficient level of electrical conductivity, resistance to thermal expansion and corrosion, but at the same time demonstrates increased hardness, microhardness and compressive strength while maintaining a sufficient margin of plasticity. In addition, at a load of 400H, it is characterized by at least a threefold decrease in the wear rate and coefficient of friction and an increased maximum setting load by more than one and a half times while maintaining the level of temperature self-heating. The results obtained allow us to recommend the developed composite material AM4.5Kd-10%TiC for the manufacture of tribo-coupling parts operated under increased loads and temperatures.