Effect of the Cr2O3 and TiO2 as nucleating agents in SiO2-Al2O3-CaO-MgO glass-ceramic system

• Published in: Metals and materials international Vol. 23; no. 4; pp. 798 - 804
• Main Authors: Back, Gu-Seul, Yoon, Mi-Jung, Jung, Woo-Gwang
• Format: Journal Article
• Language: English
• Published: Seoul The Korean Institute of Metals and Materials 01.07.2017; Springer Nature B.V; 대한금속·재료학회
• Subjects: Activation energy; Aluminum oxide; Characterization and Evaluation of Materials; Chemistry and Materials Science; Chromium oxides; Crystallinity; Crystallization; Differential scanning calorimetry; Engineering Thermodynamics; Glass ceramics; Heat and Mass Transfer; Heat treatment; Machines; Magnesium oxide; Magnetic Materials; Magnetism; Manufacturing; Materials Science; Metallic Materials; Nucleation; Processes; Scattering; Silicon dioxide; Solid Mechanics; Thermal analysis; Titanium dioxide; Titanium oxides; X-ray diffraction; 재료공학; crystallization; recycling; Kissinger method; nucleation agent; glass-ceramics
• ISSN: 1598-9623; 2005-4149
• DOI: 10.1007/s12540-017-6714-9

The nucleation agent is one of the most important factors in glass-ceramics as it can control either the crystallization temperature or the activation energy. In this study, we investigated the effect of two common nucleation agents, TiO 2 and Cr 2 O 3 , in the SiO 2 -Al 2 O 3 -CaO-MgO system. To determine the effect of TiO 2 and Cr 2 O 3 on nucleation, we measured the crystallization temperature by differential scanning calorimetry (DSC) scanning. To determine the activation energy of nucleation, the DSC scanning was made for the selected samples at various speeds. Also, the crystallinity of the selected sample was evaluated from the scattering intensity in X-ray diffractometry. Using DSC scanning, we found that TiO 2 was effective in decreasing the crystallization temperature, while Cr 2 O 3 was effective in decreasing the activation energy. We also performed nucleation heat treatment near the glass transition point. It is found that nucleation heat treatment was not effective in decreasing the crystallization temperature in our experimental condition. The XRD scattering method results showed that temperature is the key factor in crystallization and the effect of time is not as important.