Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2010 - zeszyt 3

Al/SiC composites produced by direct extrusion using the KOBO method

nr katalogowy: 52709

The constantly increasing interest in metal-ceramic composites has been inspired by the unique properties of these materials. Their high strength properties, good wear resistance, ability to work at elevated temperatures, and low density make them very attractive for the automobile, spacecraft, aircraft and electronic industries. The amount of these composites used in the industry increased from 3.6×103 tons in 2005 to 4.9×103 tons in 2010 [1, 2]. The Al/SiC composites are increasingly used in the automobile industry for manufacturing the components of car engines. Thanks to their advantageous properties, the Al/SiC composites supersede aluminum and its alloys. They are used for the manufacture of pistons, connecting-rods, and brake plates. The methods, most often reported in the literature, employed for producing rods of Al/SiC composites are the extrusion techniques. In these methods, the material prepared for the extrusion process is a mixture of appropriate powders, which is consolidated or capsuled. The consolidation is performed using various techniques such as e.g. hot-pressing or melt-pressing [3÷5]. A method which permits avoiding the hot-pressing or sintering operations is the KOBO method, in which a solid material or a powder mixture is extruded in a press with a reversely rotating die. Thanks to the rotation of the die, the deformation path of the material varies during the process. The KOBO method is particularly advantageous since it permits reducing the extrusion forces necessary for the composite material to be fully consolidated [6, 7]. Experimental The matrix material for the Al/SiC was prepared from a commercial Al powder with a purity of 99.7% and an average particle size of 6.74 μm (delivered by the Bend-Lutz Co). The reinforcing phase was made of a SiC powder with a purity of 99.8% and an average particle size of 0.42 μm (Alfa Aesar Co). The size of the particles of the powders was selected so[...]

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2010-3

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