Influence of CaO and ZnO Content on the Crystallization and Foaming of CaO-Al2O3-SiO2 Glass-ceramics

doi:10.3724/SP.J.1077.2012.00191

Journal of Inorganic Materials ›› 2012, Vol. 27 ›› Issue (2): 191-194.DOI: 10.3724/SP.J.1077.2012.00191

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Influence of CaO and ZnO Content on the Crystallization and Foaming of CaO-Al₂O₃-SiO₂ Glass-ceramics

XU Bo¹, CAO Jian-Wei², LIANG Kai-Ming¹

(1. Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China; 2. Department of Chemistry, Tsinghua University, Beijing 100084, China)

Received:2011-01-14 Revised:2011-04-22 Published:2012-02-10 Online:2012-01-05
About author:XU Bo. E-mail: xubo06@mails.tsinghua.edu.cn

Abstract

Abstract:

CaO-Al₂O₃-SiO₂ system glass were used to produce foam glass-ceramics with high performance. Influence of ZnO and CaO contents on the crystallization and foaming behavior of CaO-Al₂O₃-SiO₂ glass, were investigated using graphite as foaming agent. Addition of ZnO can suppress the crystallization of pseudowollastonite, improve the sintering of the mixture of glass powder and foaming agent, and reduce the combustion-loss of foaming agent at low temperature. Further addition of CaO leads to higher crystallinity, as well as higher glass-viscosity, which will hamper the foaming process and get poorer foaming ability. 18wt% CaO and 6wt% ZnO in CaO-Al₂O₃-SiO₂ glass are helpful to produce foam glass ceramics with high porosity at the sintering temperature of 1000℃.

Key words: foam glass ceramics, wollastonite, pseudowollastonite

CLC Number:

TB321

XU Bo, CAO Jian-Wei, LIANG Kai-Ming. Influence of CaO and ZnO Content on the Crystallization and Foaming of CaO-Al₂O₃-SiO₂ Glass-ceramics[J]. Journal of Inorganic Materials, 2012, 27(2): 191-194.

Figures/Tables 9

Table 1 Chemical composition of different samples (wt%)

Sample	SiO₂	Al₂O₃	Others	CaO	ZnO
A	63	6	13	18	0
B	63	6	13	18	6
C	63	6	13	27	6

Fig. 1 DTA curves of sample A, B and C

Fig. 2 XRD patterns of sample B sintered at different temperatures

Fig. 3 Relation of sintering temperature and volume weight of samples

Fig. 4 SEM images of sample B sintered at different temperatures for 10 min (1wt% graphite added)

Fig. 5 XRD patterns of sample A, B and C sintered at different temperatures (1wt% graphite added)

Fig. 6 SEM images of sample B sintered at different temperatures for 10 min (1wt% graphite added)

Table 2 Crystallinity of sample A, B, C sintered at different temperatures(1wt% graphite added) (%)

Temperature	Sample A	Sample B	Sample C
850℃	21	10.9	15.5
950℃	29	18.8	30.0
1000℃	30	29.5	43.0
1050℃	28	27.8	42.0

Table 3 Wollastonite content of sample A, B, C sintered at different temperatures(1wt% graphite added) (%)

Temperature	Sample A	Sample B	Sample C
850℃	3.5	2.7	8.5
950℃	5.8	9.9	26.7
1000℃	8.5	16.5	42.8
1050℃	14.0	19.1	42.0

References 8

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[8]	WANG Kai-Tai, LI Han-Liang, CHEN You-Xin, et al. Crystal phase and its change in white glass-ceramics in CaO-Al2O3-SiO2 system. Journal of Inorganic Materials, 1996, 11(02): 214-218.

Influence of CaO and ZnO Content on the Crystallization and Foaming of CaO-Al₂O₃-SiO₂ Glass-ceramics

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