Analysis of the Impact of Surface Layer Parameters on Wear Intensity of Friction Pairs / Analiza Wpływu Parametrów Warstwy Wierzchniej Na Intensywność Zużycia Par Ciernych

Thermally spraying with micro-jet cooling is an innovate technology. It is possible to get fine dispersive structure of coatings during the shorter time in comparable to the classical high velocity oxygen fuel process (HVOF). It corresponds with good corrosion-erosion properties of structure. In the paper the parameters of the spraying with micro-jet cooling process are presented. The selected properties of coatings obtained by hybrid method are presented. The results of wear tests for hybrid and HVOF coating are compared. Results of investigation are very optimistic. The presented technology should be adapted to the actual production of protective coating for machines and construction working in wear conditions.

Section: The Idea Of Hybrid Spraying Methods Combinedmentioning

confidence: 99%

New Technological Concept for Thermal Spray Protective Coatings

Szczucka-Lasota

Piwnik

2017

“…Hence there is a need to search for new applications for materials characterized by a high resistance to the abrasive wear. A reduction in the wear of machines is very important, bearing in mind also the respect for raw material reserves [3,4]. This paper presents results of tests of wear properties of the steels and cast steels commonly used in the mining industry as well as austempered ductile irons -ADI that may find many applications in the future.…”

Section: Introductionmentioning

confidence: 99%

Abrasive Wear Properties of Fe-Based Alloys Designed for Mining Applications

Wieczorek¹,

Myszka²

2017

The purpose of this study was to determine experimentally the wear properties of 5 groups of iron-based alloys used in the mining and transport machines exposed to the action of a hard abrasive material. The groups of materials to be examined included austempered ductile irons (ADI), steels and cast steel designed for quenching and tempering and for surface hardening, hard-wearing hardened steels and structural steels. The wear tests were carried out on a disc-on-disc test rig. The test samples were examined under conditions of sliding mating, while the leading destructive process was microcutting of the surface with loose corundum grain. The loss of mass of the examined samples was measured as a parameter characterizing the wear. Base on it, other wear coefficients were determined, for example the volume loss, the intensity of wear and the wear rate. The volume loss values determined were presented as a function of the strength and the initial hardness. Based on the results obtained, it was found that the hardened steel and ADI had comparable wear properties, while the ADI surface was strengthened probably as a result of the transition of austenite into martensite and the impact of the deformation of the graphite contained in ADI on the abrasive wear of the surface.

“…At the stage of designing the elements essential for providing the required functionalities of machines and equipment operating in harsh environmental conditions, the attention should be paid to such a selection of materials so that the possibility of operation in conditions of the real impact of operating factors is ensured [1]. That's because during the operation of machines and equipment, there takes place a combined action of factors inducing the processes of destruction of individual elements of the machines.…”

Section: Introductionmentioning

confidence: 99%

Operation-Oriented Studies on Wear Properties of Surface-Hardened Alloy Cast Steels Used in Mining in the Conditions of the Combined Action of Dynamic Forces and an Abrasive Material

Wieczorek

2017

This paper presents the results of wear tests of shot-peened and not shot-peened cast steels used in the mining machinery industry, in particular in the construction of chain drums for armoured face conveyors. Wear tests were carried out in the conditions corresponding to the real operating conditions of armoured face conveyors during drifting work in rocks such as sandstone. The operating factors subjected to the analyses included the presence of quartz abrasive and the impact of external dynamic forces. On the basis of the wear tests as well as the microhardness and microstructure examinations performed, it has been found that the action of an additional dynamic force has a synergistic impact on the process of abrasive wear in loose quartz abrasive. It has been further found that the value of abrasive wear of chain wheels operated in the conditions of a combined action of abrasive and a dynamic force depends on whether the area of mating of wheels with the chain was shot-peened or not before the wear tests -an increase in the abrasive wear was observed for the wheels made of cast steel subjected to shot peening in the area of mating with the chain. Lower resistance to abrasive wear of the cast steels subjected to shot peening before the wear tests could result from the formation of cracks in the surface layer caused by the action of shot.