Zużycie i struktura powierzchni po współpracy w warunkach tarcia technicznie suchego w kompozytach AK12-cząstki ceramiczne

Przedstawiono korelacje pomiędzy strukturalnymi elementami budowy kompozytów a geometrią warstwy wierzchniej, tworzonej w warunkach tarcia technicznie suchego. Na podstawie przeprowadzonych badań profilografometrycznych struktury powierzchni kompozytów AK12-Al2O3 po współpracy opisano zależność pomiędzy wielkością cząstek zbrojących a geometrią warstwy wierzchniej kompozytu. Badania dowiodły możliwość sterowania geometrią powierzchni trących poprzez właściwy dobór geometrii komponentów.

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Aluminum - based metal matrix composites are well - known for their high specific strength, stiffness and hardness. They are gaining further importance as their potential for wear resistance becomes established [1]. In general, for sliding against metal and abrasives, many studies have reported that composites exhibit better wear resistance than the unreinforsed alloys [2]. In the article the results of the researches on the surface of composites MMCs reinforced Al2O3 particles after collaboration in technically dry friction conditions are presented. Investigations were made with the use of Taylor-Hobson profilograph. Tested materials were matrix alloy composites AK12 reinforced Al2O3 particles (10, 25.50 um) (Tab. 1), after collaboration with cast iron. For all samples sliding distance was 5000 m, load 35 N and sliding velocity 0.5 m/s. Abrasion was carried out with the use of tribological tester T-01 pin-on-disc. Wear trace topography is presented in Figures 2-5. Acquired results of measurement ware analyzed with the use of parameters characterizing surface roughness and waviness (Ra, Rz, Rmax, Wa, Wz, Wmax), The values for particles materials are presented on the diagram (Fig. 10). For full char­acteristic of the consumed surface Abbot curves were determined for each of tested materials (Figs 6-9). Relationship between composite surface topography and particle value used for reinforcing materials was found. In case of small particle diameter wear profile is regular and loss is the smallest. Together with particle diameter wear, surface roughness and waviness increase. Increase of surface load capacity goes tether with reinforced particles diameter. It can be conducted that reinforced particles size let modify composite exploitation conditions, friction coefficient, load capacity, roughness and waviness.