Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2011 - zeszyt 1

The influence of mechanical alloying on the properties and fragmentation of aluminium powder obtained from recycled material

nr katalogowy: 57711

The interest in recycled materials subject is to a continuous rising. In accordance with the rules of the European Union, all materials deriving from waste products or forming part should be made with the aim to be requited. Aluminium chips are used in industry, mainly in foundry operations, which allow high tolerances with selecting the chemical composition. However, that forming technique causes high environmental pollution and forms other scraps in the final stage of processing generated elements. Also, going through the liquid phase, reduces the resultant properties of the alloy, and causes high energy consumption. For this reasons researches are actually carried out with the aim to developed recycled materials which have to be interesting properties [1÷3]. In scientific publications there are several examples of the use of aluminium chips in the powder metallurgy (PM) process. The biggest problem is the segregation of aluminium and aluminium-alloy chips depending on their impurities, lubricants and according to their chemical composition. The undesirable emulsion can be removed by chemical or physics methods. The most popular are thermal methods, which take into account economic, technological and environmental aspects. Temperatures about (490÷505°C) allow to get rid of accumulated grease and stresses forming during the machining process [2]. The cleaned aluminium chips before to be used for the production of the powder metallurgy components should be milled to reduce their size or to homogenize their chemical composition. PM allows also to obtain composites by mechanical alloying (MA). This process allows to obtain alloys without passing through the liquid phase, with lower transformation temperature of the material, preventing oxidation and reducing production costs. The ability to produce the composite powders with uniform distribution of reinforcement particles in the matrix is an another significant advantage [3]. Me[...]

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