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ZrO2-nucleated calcium aluminate glass-ceramics with mid-infrared transparency

Published online by Cambridge University Press:  01 February 2006

Jiin-Jyh Shyu  and
Hung-Chuan Mai
Jiin-Jyh Shyu*
Affiliation:
Department of Materials Engineering, Tatung University, Taipei 104, Taiwan, Republic of China
Hung-Chuan Mai
Affiliation:
Department of Materials Engineering, Tatung University, Taipei 104, Taiwan, Republic of China
*
a)Address all correspondence to this author. e-mail: jjshyu@ttu.edu.tw
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Abstract

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.

Keywords

Nucleation & growthSi
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 2 , February 2006 , pp. 465 - 472
Copyright
Copyright © Materials Research Society 2006

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