The influence of mechanical activation of talc-filler on the quality of the refractory coatings

Abstract

For development of the refractory coatings with controlled rheologic properties, for application in new Lost Foam casting process, the influence of the mechanical activation on the talc-based filler’s properties change was examined. The test referred to the change of filler particles’ size and shape, as well as to dispersion ability and stability of the coating suspension. Optimization of the coating composition was attained chosing the right size and grain shape factor of the activated filler. In addition, different coating components were applied and the coating production procedure was altered. It was shown that application of this type of the water-based refractory coatings had a positive influence on surface quality, structure and mechanical properties of the aluminium alloy castings.