Obtención y ensayos de la aleación de zinc aluminio 27 reforzado con partículas cerámicas.

Abstract

The metal matrix composites (MMC) reinforced with ceramic particles provide good mechanical and wear resistance properties. In this paper the process of obtaining alloys based Zinc is set with 27% Aluminum (ZA27) and alloys ZA 27 reinforced with ceramic particles of silicon carbide, alumina and quartz which were obtained by melting the base materials in a crucible furnace burner of 6 points with liquefied petroleum gas (LPG) in which a vortex at 3000 rpm to add magnesium proceeding as wetting surfactant and then reinforcements ceramic particles was generated. ZA 27 alloys were attacked with chemical reagent Palmerton to be analyzed then. The microstructure of the base metal shows  dendritic structure comprised of primary dendrites  rich in aluminum surrounded by a eutectoid +β and a meta stable phase  in the interdendritic zone, and a residual β phase rich in zinc. It is noted that the inclusion of ceramic particles to matrix metal improved antiwear properties and hardness but conversely it affected impact resistance being ZA27 alloy reinforced with particles of silicon carbide of 102 um the most representative because of its HB 131 high hardness and low wear rate that is reduced to one fifth compared to metal without reinforcements.