Effect of drying time on compressive strength, impact strength and macro structure of crucible materials made from evaporation boats waste, graphite and kaolin

Abstract

Production of food packaging generates evaporation boats waste. Evaporation boats waste can be applied as a basic material for crucibles. Green body crucible drying can use a dryer to be well controlled. The purpose of this study was to determine the effect of drying time on compressive strength, impact strength and the macro structure of crucible materials made from evaporation boats waste, graphite and kaolin. The research method used is experimental research. The composition of the crucible with a weight percentage consists of 50% evaporation boats wasted mixed with 25% graphite and 25% kaolin and 15% water from the total weight of the mixture. Mixing material for 1 hour. The mixture of materials was put into molds of ASTM C373 and ASTM D256 standard specimens and compacted to 20â MPa. The specimens were then dried with time variations of 2, 3, and 4 hours at a temperature of 100ËšC and then fired at a temperature of 1000ËšC using a furnace with a heating rate of 5ËšC/minute and a holding time of 2 hours. The test included testing of compressive strength, impact strength and observation of macro structures. The results showed that the drying time of 4 hours resulted in the highest average compressive strength value of 17.04â MPa and the highest average impact strength value of 0.0045 Joule/mm2. The test specimens have brittle fractures with flat, shiny fracture characteristics, the fractures can be reassembled and there is no deformation just before the material fractures.