Premium
Sintering Behavior and Properties of Iron‐Rich Glass‐Ceramics
Author(s) -
Karamanov Alexander,
Taglieri Giuliana,
Pelino Mario
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.1551-2916.2004.01571.x
Subject(s) - materials science , sintering , scanning electron microscope , crystallization , porosity , composite material , ceramic , porous glass , flexural strength , glass ceramic , vickers hardness test , microstructure , mineralogy , chemical engineering , engineering , chemistry
Iron‐rich glass‐ceramics were obtained by the sintering of two glass powders, labeled G1 and G2, at heating rates of 5° and 20°C/min followed by an isothermal step in the 850°–1050°C temperature interval. The sintering process was evaluated by the linear shrinkage; the closed porosity was estimated by density measurements; the structure and the morphology of the glass ceramics were observed by scanning electron microscopy. The bending strength, the Young modulus, and Vickers hardness of the glass‐ceramics materials were evaluated. The results showed that the sintering process and morphology of the glass‐ceramics depends on the amount of magnetite and pyroxene formed. With a low percentage of crystal phase formed (25%–30% typical of G1) the structure is characterized by closed porosity; at higher crystallization (45%–50% typical of G2) open porosity is mainly formed. The properties of the glass‐ceramics were not influenced by the heating rate but improved with an increase in the degree of crystallization.