Effect of heat treatment on 7Na 2O–23B 2O 3–70SiO 2 glass

• Published in: Ceramics international Vol. 37; no. 6; pp. 1769 - 1773
• Main Authors: Zhou, Zhujun, Wang, Moo-Chin, Han, Jianjun, Xu, Feng, Zhao, XiuJian
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 2011
• Subjects: 7Na 2O–23B 2O 3–70SiO 2 glass; Acid leaching thermal treatment; Phase-separation; Porous glass; Phase-separation; 7Na 2O–23B 2O 3–70SiO 2 glass; Acid leaching thermal treatment; Porous glass
• ISSN: 0272-8842; 1873-3956
• DOI: 10.1016/j.ceramint.2011.01.047

Porous 7Na 2O–23B 2O 3–70SiO 2 glass was successfully fabricated by acid leaching treatment and phase-separation. The 2 mol/l hydrochloric acid (HCl) solution treatment was used for 24 h. Thermal analysis and X-ray diffraction were used to identify the temperature range of heat-treatment. The average pore size and the pore volume were investigated by a nitrogen adsorption instrument, and SEM was used to characterize the appearance of the porous glass. The results show that the average size of pores changed from 3.75 nm to 3.03 nm when heat treated at 640–680 °C for 6 h. In addition, when heat treated at 640 °C for 6–24 h, the pore size fell from 3.75 nm to 3.66 nm. The surface area and pore volume become larger with the increase in both temperature and heat treatment time.