Sintering Behavior of LZS Glass-Ceramics

Abstract:

Sintering and crystallization behaviors of a LZS glass-powder were investigated by means of thermal shrinkage, differential thermal analysis, X-ray diffraction as well as density and mechanical properties measurements. The melted glass, 9.56Li₂O.22.36ZrO₂.68.08SiO₂ (wt%) first was cast into water to provide a frit for milling. The milled glass powder (mean particle size 5.0 µm) was then uniaxially pressed at 100 MPa and the obtained samples were isothermally sintered in the 800-950°C temperature range in air for appropriated time intervals (15-120 min). Sintering was found to start at about 640°C and crystallization took place just after completion of sintering and was almost complete at 920°C. The glass powder compacts crystallized into lithium and zircon silicates so that glass-ceramics with relative densities between 84 and 99% were obtained reaching maximum hardness and bending strength values of 8 ± 0.5 GPa and 214 ± 20 MPa, respectively.

• Periodical: Materials Science Forum (Volumes 727-728)
• Pages: 1028-1033
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.727-728.1028
• Online since: August 2012
• Authors: Jaime Domingos Teixeira, Antonio Pedro Novaes de Oliveira, Lourival Boehs, Francielly Roussenq Cesconeto, Cristina Siligardi, Manuel Alfredo Pereira
• Keywords: Ceramic, Crystallization, Glass-Ceramic, Sintering

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