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Properties and crystallization of Li2O–CaO–Al2O3–SiO2–TiO2 glasses

Published online by Cambridge University Press:  31 January 2011

Moo-Chin Wang  and
Min-Hsiung Hon
Moo-Chin Wang
Affiliation:
Department of Mechanical Engineering, National Kaohsiung Institute of Technology, 415 Chien-Kung Road, Kaohsiung, 80782, Taiwan, Republic of China
Min-Hsiung Hon
Affiliation:
Department of Materials Engineering, National Cheng Kung University, 1 Ta-Hsueh Road, Tainan, 70101, Taiwan, Republic of China
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Abstract

The addition of CaO to Li2O–Al2O3–SiO2–TiO2 (LAST), forming the Li2O–CaO–Al2O3–SiO2–TiO2 (LCAST) system, is used in the preparation of low themal expansion coefficient glass-ceramics. By a progressive weight percent substitution of CaO for SiO2, at constant ratios of concentration of Li2O, Al2O3, and TiO2, a number of properties of these glasses have been studied. The results indicated that these thermal properties increased progressively with increasing CaO concentration. X-ray diffraction analysis was utilized to identify the crystalline phase in glass-ceramics of the Li2O–CaO–Al2O3–SiO2-TiO2 system. The d-spacings of the major crystallites were precisely measured and fitted with those of β-spodumene. The minor crystalline phase of titanite, CaO · TiO2 · SiO2, was also present. The average thermal expansion coefficients from 25 to 700 °C were 3.50 × 10−6/°C, 3.81 × 10−6/°C, and 3.91 × 10−6/°C for samples A, B, and C, respectively.

Type
Articles
Information
Journal of Materials Research , Volume 8 , Issue 4 , April 1993 , pp. 890 - 898
Copyright
Copyright © Materials Research Society 1993

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