Phase transformation and microstructure of wollastonite glass–ceramics in Na2O–CaO–SiO2 system under different heat treatment conditions. (July 2014)

• Record Type: Journal Article
• Authors: Yao, S. Y.; Cao, H. X.; Wang, P.; Zhang, W. W.; Huo, W. L.; Xu, W.
• Is Part Of: Materials research innovations. Volume 18:Number 4(2014)
• Page Start: 657
• Page End: 660
• Publication Date: 2014-07
• Subjects: Materials -- Research -- Periodicals; Matériaux -- Recherche -- Périodiques; 620.1105
• DOI: 10.1179/1432891714Z.000000000763
• Languages: English
• ISSNs: 1432-8917

Abstract

<abstract> <title> <x content-type="archive" xml:space="preserve">Abstract</x> </title> <p>Wollastonite glass–ceramic was prepared by using a sintering method. The chemical compositions were in the wollastonite crystallisation primary field of the Na₂O–CaO–SiO₂ system. Effects of heat treatment conditions on phase transformation and microstructure evolution of wollastonite glass–ceramic in Na₂O–CaO–SiO₂ system were investigated using X-ray diffraction and scanning electron microscopy. The results showed that the plate-like devitrite (Na₂Ca₃Si₆O₁₆) crystals were firstly precipitated from the parent glass after heat treatment at 950°C and long strip shape wollastonite (α-CaSiO₃) crystals appeared in the clearance of Na₂Ca₃Si₆O₁₆ at 1000°C. When the heat treatment temperature increased to 1050°C, the Na₂Ca₃Si₆O₁₆ peak disappeared and α-CaSiO₃ became the single phase. Furthermore, the complete phase transformation from α-CaSiO₃ to pseudowollastonite (β-CaSiO₃) occurred at 1200°C. As the heat treatment temperature increased, the sample surface changed from 'convex' into 'concave'.</p> </abstract>