PENGARUH VARIASI KOMPOSISI KAOLIN DAN ALUMINA TERHADAP SIFAT FISIS DAN MEKANIK PADA REFRAKTORI BATA TAHAN API

Aji  Sutrisno; Tumpal  Ojahan R

doi:10.53067/bmj.v3i3.110

Authors

Aji Sutrisno Universitas Malahayati, Lampung
Tumpal Ojahan R Universitas Malahayati, Lampung

DOI:

https://doi.org/10.53067/bmj.v3i3.110

Keywords:

Kaolin, Alumina, Fire Brick

Abstract

The development of metal smelting, cement, ceramic, and power generation industries demands materials capable of withstanding high temperatures and extreme environmental conditions. One such material widely used in these applications is refractory brick. Broadly speaking, refractory materials are multiphase ceramics designed to operate under harsh service conditions at very high temperatures. Refractory bricks belong to the group of refractory ceramics due to their ability to endure elevated temperatures (Utomo, 2010). Kaolin serves as a binder due to its excellent bonding properties with quartz. Kaolin consists of alumina and silica derived from the weathering of feldspar minerals or granite rocks. Analysis of its mineral composition reveals major components including silica (SiO₂) at 48.70%, alumina (Al₂O₃) at 36.73%, water (H₂O) at 13.96%, and trace amounts of metal oxides. This study aims to analyze refractory bricks produced by sintering kaolin and alumina at 700°C, followed by varying compositions of kaolin, alumina, and chamotte, and firing at 1300°C. Based on the test results, variations in material composition influence the structure and strength of alumina-based refractory bricks. Porosity, linear shrinkage, and compressive strength tests indicate that Sample 2 exhibits the highest compressive strength among all variations.

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