Sembiring, Simon and Simanjuntak, Wasinton and Situmeang, Rudy T.M and Riyanto, Agus and Junaidi, Junaidi (2018) STRUCTURAL AND PHYSICAL PROPERTIES OF REFRACTORY CORDIERITE PRECURSORS PREPARED FROM RICE HUSK SILICA WITH DIFFERENT MgO ADDITION. Ceramics-Silikáty, 62 (2). pp. 163-173. ISSN ISSN 0862-5468 (Print), ISSN 1804-5847 (online)

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Abstract

This study describes the structural and physical properties of refractory cordierite prepared from rice husk silica, which is sintered at a temperature of 1230°C and followed by the addition of periclace (MgO) from 5 to 30 % by weight. The phases formed and structur e changes as a result of periclace addition were investigated using different characterization technique of X-ray diffraction (XRD) coupled with Rietveld analysis, and scanning electron microscopy (SEM). Density, porosity, hardness, bending str ength and coefficient of thermal expansion ar e also measur ed. The results obtained revealed that the addition of periclace of 10 to 30 % promoted the transformation of the cordierite to the forsterite and spinel, and the cordierite is practically undetectable. Addition of periclace was found to increase forsterite and decrease spinel. The presence of forsterite and spinel resulted in increased of density, hardness, bending strength, and thermal expansion coefficient, as well as decreased porosity. The coefficient of thermal expansion of the samples with the addition of 10-30 % periclace reach the relatively constant value of 8.2 × 10 °C, with the main crystalline phase is forsterite, followed by spinel in smaller quantities.

Item Type: Article
Subjects: Q Science > QC Physics
Divisions: Fakultas Matematika dan Ilmu Pengetahuan Alam (FMIPA) > Prodi Fisika
Depositing User: Dr. JUNAIDI
Date Deposited: 22 Jun 2018 03:53
Last Modified: 22 Jun 2018 03:53
URI: http://repository.lppm.unila.ac.id/id/eprint/7489

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