ZrO2-nucleated calcium aluminate glass-ceramics with mid-infrared transparency
A silica-free MgO–CaO–BaO–Al2O3–ZrO2 glass was converted into glass-ceramic by adding zirconia as a nucleating agent. The crystallization and properties of the glass-ceramics were investigated. It was found that ZrO2 is an efficient nucleating agent for the present calcium aluminate glass. Addition...
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Published in | Journal of materials research Vol. 21; no. 2; pp. 465 - 472 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
New York, USA
Cambridge University Press
01.02.2006
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Subjects | |
Online Access | Get full text |
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Summary: | A silica-free MgO–CaO–BaO–Al2O3–ZrO2 glass was converted into glass-ceramic by adding zirconia as a nucleating agent. The crystallization and properties of the glass-ceramics were investigated. It was found that ZrO2 is an efficient nucleating agent for the present calcium aluminate glass. Addition of an appropriate amount of ZrO2 changed the crystallization behavior from surface nucleation to internal nucleation. The primary crystalline phase was Ca3Al2O6, which exhibited bulk nucleation. When the crystallizing time was increased, BaAl2O4 formed as a surface layer that grew from the surface into the interior of the sample. The hardness was increased when the parent glass was converted into glass-ceramics. The glass-ceramics without BaAl2O4 surface layer have visible-to-infrared transparency comparable with the parent glass. The transparency was substantially reduced after the development of the surface layer. |
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Bibliography: | ark:/67375/6GQ-XJPD4J2L-3 PII:S0884291400080742 ArticleID:08074 istex:0DEB8BEB636E75051E5825AD560AA3A5E6CDED63 ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 |
ISSN: | 0884-2914 2044-5326 |
DOI: | 10.1557/jmr.2006.0053 |