International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

The work is dedicated to the study of the properties of detonation coatings AlB12-30 wt.% Al (AB70) applied to Steel 45 using the DNEPR-5M installation. The coatings have the following characteristics: thickness h ~ 170-200 μm, Hμ = 27-29 GPa, HV = 4.35 GPa. Changes in the tribological characteristics of the composite depending on the friction mode are analyzed. The AB70 coating is found to have stable tribological characteristics: f = 0.21-0.38, wear rate I = 3.3-8.6 μm/km. Samples with coatings exceed uncoated Steel 45 in wear resistance. Changes in the surface structure after friction depending on the sliding speed and load are shown. Two wear mechanisms – oxidative and adhesive-abrasive – are established. A conclusion was drawn regarding the possibility of using the AlB12-Al system to apply detonation coatings.

The article presents the results of investigations of tribotechnical properties of powder composite materials based on the ironhigh-carbon (ФХ800) ferrochrome system during dry friction with ШХ15 steel at various loads of 30, 60, and 100 N. It was found that an increase of the load from 30 to 100 N leads to an increase in the coefficient of friction from 0,45 to 0,5 (for 25% ФХ800) and from 0,40 to 0,46 (for 40% ФХ800). At the same time, the mass wear of samples made of powder materials decreases with an increase in ФХ800 content from 25 to 40 (wt. %) and with growth of the load from 30 to 100 N, respectively, from 3,5 – 8,0 to 0,75 – 1,6 mg/km., which provides wear resistance improvement (km/mm) by 2,8 – 2,2 times. X-ray phase full profile analysis using the Rietveld method established that there are 2 phases: metallic α-Fe (79,68%) and carbide Me7C3 (20,32%) in the composite Fe – 25%ФХ800 and 3 phases: α-Fe (69,5%), γ-Fe (3,96%) and carbide Me7C3 (26,57%) in the Fe – 40% ФХ800 composite. Topographic studies of 2D profiles of worn surfaces of composites after friction under different loads were conducted. The results of optical profilometry show that the main mechanism of destruction of the powder composite surface during dry friction with ШХ15 steel is adhesive wear (seizing) of the contacting surfaces.