Premium
Microstructural Evolution in Fast‐Heated Cordierite‐Based Glass‐Ceramic Glazes for Ceramic Tile
Author(s) -
Torres Francisco Jose,
Alarcón Javier
Publication year - 2004
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2004.tb07717.x
Subject(s) - cordierite , materials science , crystallization , microstructure , ceramic , mineralogy , tile , nucleation , glass ceramic , scanning electron microscope , phase (matter) , chemical engineering , composite material , chemistry , organic chemistry , engineering
The crystallization mechanism of α‐cordierite from a B 2 O 3 ‐ and TiO 2 ‐containing glass submitted to fast heating in the cordierite primary phase field of the CaO–MgO–Al 2 O 3 –SiO 2 quaternary system was investigated. Addition of B 2 O 3 to a SiO 2 ‐rich glass suppressed the formation of μ‐cordierite. This suppression facilitated densification by viscous flow before crystallization. Powder X‐ray diffractometry, field‐emission electron scanning microscopy, and energy‐dispersive X‐ray analysis revealed that α‐cordierite nucleated directly from glass on the boundaries of original particles and was probably favored by TiO 2 , which acted as a nucleant. The growth kinetics of α‐cordierite crystals was fast, and the crystals seemed to grow by consuming glass directly from the growing interphase. The estimated amount of α‐cordierite in the glass heated at 1160°C was 69.5 wt%, as determined using the Alegre method. The final microstructure consisted of an arrangement of well‐shaped hexagonal prisms, with sizes <3 μm, immersed in a residual glassy phase. The feasibility to develop new glass‐ceramic glazes using the present and previous works is considered.