Karakterisasi Material Refraktori pada Lining Tungku Induksi Peleburan Besi Cor PT. Suyuti Sido Maju Ceper Klaten dengan Variasi Temperatur Sintering

Abstract

In the industrial sector refractory material is required due to an increased amount of usage of high temperature furnance, particularly in the metal smelting insdutry at PT. Suyuti Sido Maju Ceper Klaten. The refractory materials use as a furnace heat insulator, so that it can stabilized the heat 13000C. The use of refractory material should be adjusted to the characteristics of the melted metal, so that the errors can be minimized and the material can be more efficient. Therefore, refractory material characterization is needed in order to determine the chemical composition analysis using XRD, grain size, and shape using the mesh, bulk density, apparent porosity, and microstructure analysis using optical microscope. In this study, refractory material in the form powder made by 240 MPa compaction pressure, with 17.8 mm dimension of mold and the height 50 mm. The process of making the specimen through the sintering process by temperature variation 12000C, 1300 0C, 14000C and time of detention/holding time 2 hours at each temperature, while the heating rate of 10oC/min and cooling rate of 20oC/min. The x-ray diffraction results showed that the main chemical composition refractory powder is quartz (SiO2) with low quartz phase, whereas the refractory specimens that have been printed and sintered at 14000C appears the cristobalite phase. The results form and grain size showed that the refractory powder classified by major types of sub-angular grain size between 0.062 to 4 mm. density and porosity values at a temperature of 12000C, 13000C, 14000C in a row is 2.16 g/cm3, 2.22 g/cm3, 2.28 g/cm3 and 18.47%, 18.25 %, 16.62%. the results of microstructure analysis show that increasing the sintering temperature refractory pores has narrowed.