Effect of melting temperatures on the crystallization and densification of 2.8MgO super(.1.5Al) sub(2) sub(3) super(.5SiO) sub(2)glass-ceramic synthesized from mainly talc and kaolin

• Published in: Journal of alloys and compounds Vol. 509; no. 5; pp. 1874 - 1879
• Main Authors: Banjuraizah, Johar, Mohamad, Hasmaliza, Ahmad, Zainal Arifin
• Format: Journal Article
• Language: English
• Published: 03-02-2011
• Subjects: Alloys; Crystallization; Densification; Density; Glass ceramics; Kaolin; Melting; Talcs
• ISSN: 0925-8388
• DOI: 10.1016/j.jallcom.2010.10.077

Single phase alpha -cordierite with low sintering temperature was produced from 2.8MgO super(.1.5Al) sub(2) sub(3) super(.5SiO) sub(2)chemical formulation using mainly talc and kaolin. The effect of melting temperature to the densification, crystallization and properties of alpha -cordierite glass-ceramic was investigated. XRD patterns indicate that, melting at 1350, 1385 and 1400 degree C are not sufficient to completely transform the crystalline mixture of compound to fully amorphous phase. DTA peaks demonstrate that the crystallinity of phase, the onset of crystallization temperature, increased as the melting temperature raise. Similar observation trends can be seen from their micrographs, density, dielectric and CTE measurements. Temperature of melting has significantly affected the properties of glass-ceramic.