| Abstrakt: |
A crucible is a container shaped like a pot or a bowl used for smelting non-metallic materials, quality of the crucible can be influenced by several factors, including the selection of the constituent materials, the particle size used the amount of compaction pressure, and the length of firing time in the furnace. The selection of constituent materials is done by selecting the crucible-making mixture. The use of crucibles is for pyrometallurgical processes used for gold processing. Waste is closely related to pollution because this waste is the substance of environmental pollution therefore, waste treatment is needed so that it does not pollute the environment, the principles of solid waste management are prevention, recycling one example of solid waste is evaporation boats. Evaporation boats are included in one of the refractory materials because the waste from evaporation boats contains boron nitride (BN) and titanium diboride (TiB2) materials. So the purpose of this research was to determine thermal shock resistance of evaporation boat waste-based crucibles. The process of making specimens begins with crushing the evaporation boat waste with a crusher machine into powder, then sieved using a 120-mesh, then mixed with graphite, kaolin, and molasses using a mixer for 90 minutes until homogeneous mixture. The mixed material is then cast using molds according to ASTM D256 standards and pressed or compacted with a compacting tool worth 40 MPa. The specimens were then dried in an oven for four hours at 100°C, after that, the specimens were sintered at 1000 °C for 2 hours with a heating rate of 4 °C/min. The Compositions evaporation boat waste, graphite, kaolin, and molasses (75%, 15%, 10%, 30%; 75%, 20%, 5%, 30%; and 75%, 25%, 0%, 30%) are the materials used. Thermal shock treatment temperatures range from 100°C to 200°C, 300°C to 400°C, and up to 500°C. The results showed the highest average value of impact resistance was in composition 3 (75%, 25%, 0%, 30%) with a thermal shock temperature of 100°C worth 0.00501 J/mm2, and the lowest was in composition 2 (75%, 20%, 5%, 30%) at a thermal shock temperature of 500°C worth 0.00359 J/mm2. The average impact resistance value for each composition decreases, which is followed by an increase in the thermal shock temperature, This is because the higher the temperature of the thermal shock, the harder the specimen becomes and the specimen becomes brittle, variations in evaporation boat waste, graphite, kaolin, and molasses as crucible materials will be better if the use of kaolin in these compositions has a low presentation, even the highest average impact resistance value is in compositions that do not use kaolin on specimen composition 3. [ABSTRACT FROM AUTHOR] |
