Liquid metallurgy stir cast technique has been employed to obtain a distribution of 14 and 28 microns SiC(p) in an aluminium base IC (internal combustion) engine piston material. Distribution of SiC(p) in the composite as observed on random metallographic sections greatly improved by either addition of magnesium metal just prior to introducing the ceramic particles and/or by pior mixing of the ceramic with a mixture of zirconia and magnesia of a proprietary composittion. Prior heating of the ceramic further improved the distribution. Problems encountered in obtaining a good distribution were identified as casting problems to be avoided by proper design of the casting process. Cast MMC slugs could be either directly machined or forged initially and then machined to final dimensions of piston geometry. Presence of SiC(p) and the oxide mixture slightly accelerated the thermal aging response and significantly improved the thermal stability and the elastic modulus. The MMC produced has been characterized for use as an IC engine piston material to point out the advantages and disadvantages. Examination of tensile fracture surfaces pointed to improved bonding of the particle to the matrix. During forging, particles moved in the direction of plastic flow without breakage or debonding. The overall objective of the project is to produce cost effective MMC material with superior properties for IC engine piston application.
Particulate metal matrix composite material development for I.C. engine piston application
Entwicklung eines pulvergefüllten Metallmatrix-Verbundwerkstoffs für die Anwendung in Kolben für Verbrennungsmaschinen
1995
8 Seiten, 10 Bilder, 2 Tabellen, 11 Quellen
Conference paper
English
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