Construction material based on aluminium and method for producing parts from said material

摘要

The invention relates to a new construction material which is based on aluminium and has high mechanical characteristics, wear and corrosion resistance, a heat stability and which can be produced by using a relatively cheap technology. The inventive material comprises a casting aluminium alloy whose composition and structure favour to obtain a quality surface hardening with the aid of the plasma electrolytic oxidation method and a hard oxide-ceramic coating produced with the aid of said method. The aluminium alloy contained in the inventive construction material represents a multiphase eutectic alloy, which comprises an alloyed matrix (of a hard aluminium alloy) reinforced by dispersed hard spots of a crystallisation nature and products of the matrix decay which are evenly distributed through the volume of said aluminium alloy. The properties of the aluminium alloy can be controlled by modifying the concentration of alloying elements, the cooling speed and a heat treatment schedule. In order to cast articles from said alloy traditional methods for casting into metallic moulds are used. The protecting ceramic coating which is formed on the surface of the casts from said alloys has a high degree of strength, microhardness, density and of the evenness of thickness.