Effects of alumina nanoparticles on the microstructure, strength and wear resistance of poly(methyl methacrylate)-based nanocomposites prepared by friction stir processing.

摘要: Abstract In this study, alumina-reinforced poly(methyl methacrylate) nanocomposites (PMMA/Al2O3) containing up to 20 vol% nanoparticles with an average diameter of 50 nm were prepared by friction stir processing. The effects nanoparticle volume fraction on the microstructural features and mechanical properties PMMA studied. It is shown that using a frustum pin tool employing appropriate processing condition, i.e. rotational speed 1600 rpm/min transverse velocity 120 mm/min, defect free at microscale fine distribution can successfully been prepared. Mechanical evaluations including tensile, flexural, hardness impact tests indicate strength toughness material gradually increases concentration reach flexural 129 MPa, 101 Shore D, energy 2 kJ/m2 for nanocomposite alumina. These values are about 10% 20% better than untreated FSP-treated (without alumina addition). Fractographic studies typical brittle crack deflection around nanoparticles. More interestingly, sliding wear rate in pin-on-disk configuration coefficient reduced 50% addition worn surfaces exhibit ploughing features.