摘要
A novel method based on polyacrylamide gel process was used to prepare Li2O-Al2O3-SiO2 （LAS） glass-ceramic powders. The effects of ZrO2 addition on the crystallization and phase transformation process in LAS system were investigated by using differential thermal analysis （DTA）, X-ray powder diffractometry （XRD） and Fourier transform infrared spectroscopy （FTIR）. The activation energy decreases from 304.6 to 248.9kJ/mol and the frequency factor decreases from 2.49×10 11 to 5.56×108 min -1 as ZrO2 content changes from 0 to 4.0%（mass fraction）. During calcination from 800 to 1200℃, hexagonal β-quartz solid-solution first crystallizes and then gradually transforms into tetragonal β-spodumene solid-solution with increasing temperature. The stability of β-quartz solid-solution increases with more ZrO2 additions and a minor crystalline phase, tetragonal zirconia, also appears.
A novel method based on polyacrylamide gel process was used to prepare Li_2O-Al_2O_3-SiO_2 (LAS) glass-ceramic powders. The effects of ZrO_2 addition on the crystallization and phase transformation process in LAS system were investigated by using differential thermal analysis (DTA), X-ray powder diffractometry (XRD) and Fourier transform infrared spectroscopy (FTIR). The activation energy decreases from 304.6 to 248.9kJ/mol and the frequency factor decreases from 2.49×10 11 to 5.56×108 min -1 as ZrO_2 content changes from 0 to 4.0%(mass fraction). During calcination from 800 to 1200℃, hexagonal β-quartz solid-solution first crystallizes and then gradually transforms into tetragonal β-spodumene solid-solution with increasing temperature. The stability of β-quartz solid-solution increases with more ZrO_2 additions and a minor crystalline phase, tetragonal zirconia, also appears.
出处
《中国有色金属学会会刊：英文版》
CSCD
2005年第S2期280-283,共4页
Transactions of Nonferrous Metals Society of China
