Analysis of the Quality of Sulfomolybdenum Coatings Obtained by Electrospark Alloying Methods

Abstract

The authors of this paper have attempted to improve the quality of surface layers applied to steel elements of machine parts constituting friction couples. The main goal of the research was to investigate an electrospark alloying method process for obtaining abrasion-resistant tribological coatings containing molybdenum disulfide on a steel surface. A substance in the form of sulfur ointment with a sulfur content of 33.3% was applied on the surfaces of C22 and C40 steel specimens. In order to determine the influence of the energy parameters of ESA equipment on the quality parameters of coatings, the ESA process was carried out using a molybdenum electrode with discharge energies Wp = 0.13; Wp = 0.55; Wp = 3.4 J. The following tests were carried out on specimens with such coatings: metallographic analysis, microhardness tests, surface roughness, and local X-ray diffraction microanalysis. The experiments revealed that sulfomolybdenum coatings consist of four zones with different mechanical properties. Depending on the discharge energy and the substrate material, the hardness of these zones varies from approx. 1100 to over 10,000 MPa. Differences in the distribution of, among others, sulfur and molybdenum in the obtained coatings, as well as differences in the microstructure of the observed coatings, were observed.

Construction of a mathematical model for approximating the sphere by strips of unfolding surfaces

“…The quality of the surface layers applied to the steel elements of the machine parts and the geometry of the contact surfaces have a significant impact on the wear resistance and durability of the parts. Research into the influence of the quality of the surface treatment of parts on microgeometry [1] confirms the close relationship between these parameters.…”

Investigation of the Structure and Properties of MoS2 Coatings Obtained by Electrospark Alloying

“…The force of friction as well as the amplitude of oscillations had been increasing from the beginning of the The X-ray structural analysis of the coatings obtained by the ESA technology was carried out, and it was performed by a Mo-electrode with the use of a sulfur-containing paste. We have previously investigated that the phase composition of the coatings on C40 steel produced at Wp = 0.55 J is represented by a solid solution of BCC, the lattice period of which is close to that of ferrite, martensite, FCC solid solution, and intermetallic FeMo (σ-phase) [39]. With an increase in the discharge energy up to Wp = 3.4 J, in addition to solid solutions, up to 5% of molybdenum disulfide is formed.…”

Evaluation of the Degree of Degradation of Brake Pad Friction Surfaces Using Image Processing

“…In order to increase the service life of drilling equipment and avoid emergency downtime due to unexpected breakdowns, companies that design and manufacture drilling equipment pay considerable attention to the optimal design of friction nodes [8,9], protection of working surfaces of critical structural elements [10,11], stable lubrication bearing supports [12,13], careful balancing of rotating parts and assemblies [14,15], vibration protection of the drilling tool [16][17][18][19], research into the interaction of the drilling tool with the rock for the development of effective technological modes of drilling and arranging wells [20][21][22][23], repair work in the well and improving maintenance resources [24], etc.…”