Reaktionssintern von AlMg-MgO zur Herstellung von Bauteilen auf Spinellbasis

Abstract

Abstract A new process for the production of spinel-based materials by reaction sintering is presented. Oxidation of aluminum is accelerated by using magnesium as an alloying element as well as by the contact to magnesia. Thus, the composition used here leads to a maximum of the reaction kinetics. The effects occurring during the oxidation process have to be properly controlled, in particular the time of wetting of magnesia by molten aluminum. The reaction can be completed at low temperatures (900–1000°C). The fairly microstructure is characterised by a closed porosity, leading to a gastight material. There is only very little volume change during reaction sintering, qualifying the material e. g. for assembling with metallic or ceramic components.