METAL QUALITY OF SECONDARY ALLOYS FOR Al CASTINGS

摘要

High mechanical properties, fatigue, pressure tight and low porosity are requirements of aluminum cylinder heads and blocks related with the quality of liquid metal. With secondary alloys can be possible to reach these characteristics. But, several control stages are necessary from row material (Al scrap) to final stage: liquid metal in the holder furnace. In order to measure the quality of liquid metal, several samples with the PreFil®-Footprinter Unit were taken along the route of melting process. The tracking of the process include melting at reverberatory furnace, fluxing, liquid treatment and degassing. The results showed areas to improve with operational practices and new degassing equipments and use of fluxes treatment.