Aluminum-ceramic composite materials reinforced with nanoparticles prepared via powder metallurgy method
Bartosz Hekner, Jerzy Myalski, Tomasz Pawlik, Daniel Michalik, Orhan Emir Kelepir
Quarterly No. 3, 2013 pages 203-207
DOI:
keywords: high energy ball milling, sintering, nanocomposites, coefficient of friction, wear, powder technology
abstract The applied methods for preparation of the reference powders contains high-energy milling in planetary mills, resulting in a particles size reduction to the dispersion level. Such a reinforcing particle size allows one to obtain high wear resistance. Apart from size-reduction of the ceramic phase, mechanical coupling of hard ceramic and plastic metallic (matrix of the composite) particles takes place. Stable coupling between the ceramic and metallic particles was obtained by pressing and sintering in a high-temperature press. This method allows one to eliminate the problems occurring in classic casting technologies applied for the manufacturing of composites such as: low wettability of the particles by liquid metal or a heterogeneously distributed reinforcing phase. In addition, the applied modification of the composite composition with glassy carbon particles, contributed to the change in the wear mechanism of the composite and cooperating cast iron. Evaluation of the tribological properties was performed by friction and wear coefficient determination. SEM observations of the composite powder and of the composite allowed the authors to evaluate the influence of the powder preparation process parameters on the composite microstructure.