Author:

Keywords:

nanostructured material, cermet, atmospheric plasma spraying, laser sintering, tribology, thermal processing, Science & Technology, Physical Sciences, Technology, Chemistry, Multidisciplinary, Nanoscience & Nanotechnology, Materials Science, Multidisciplinary, Physics, Applied, Physics, Condensed Matter, Chemistry, Science & Technology - Other Topics, Materials Science, Physics, Nanostructured Material, Cermet, Atmospheric Plasma Spraying, Laser Sintering, Tribology, Thermal Processing, COATINGS, STRENGTH, DEPOSITS, FRICTION, COPPER, SIZE, 03 Chemical Sciences, 09 Engineering, 10 Technology, 34 Chemical sciences, 40 Engineering

Abstract:

The feasibility of achieving a nanostructured material after different thermal processing of nanosized powders is presented. The thermal processing was done by either atmospheric plasma spraying, laser sintering, or extrusion followed by hot isostatic pressing. The structural characterisation of such thermally processed nanostructured Fe-based and Cu-based metallic or Al₂O₃ reinforced cermets, confirmed the retention of a nanostructure after each of these thermal processes. Hardness measurements confirmed an increased hardness as expected in the case that nanostructuring is achieved. The role of grain boundaries and second phase particles on the retention of the nanostructure after thermal processing is discussed. Finally, the possible benefit of nanostructuring on the friction and wear behaviour of materials in sliding tests against corundum in ambient air is reported and discussed.