The effect of Alumina Partial Substitution as Filler on Refractory Coating based on Zirconium Silicate for Aluminium Casting Applications

摘要

Die soldering is common problem in casting process that is inducing damage to dies and result bad quality of casting product. The application of Zirconium Silicate (ZrSiO2) as the main refractory coating material cost quite expensive, thus, substitution material is required to reduce production cost. Alumina (Al2O3) can be considered as alternative material because of its high melting temperature character. This research aims to determine various possibility of alumina partial substitution as filler on foundry coating. To optimize this research, some sample is also applied heated and non-heated treatment. This research analyzes such as Particle Size Analyzer (PSA), viscosity, and thermal analysis using Differential Thermal Analysis (DTA) method. Figures are scanned by Scanning Electron Microscope (SEM) that is facilitated by EDX to determine composition of coating materials. The result shows that Alumina can be considered as additional material for filler coating. 20% Alumina consentration plus heat treatment would give the most optimum result.