ZnO和CaO含量对CaO-Al2O3-SiO2系泡沫微晶玻璃析晶与发泡的影响

doi:10.3724/SP.J.1077.2012.00191

无机材料学报 ›› 2012, Vol. 27 ›› Issue (2): 191-194.DOI: 10.3724/SP.J.1077.2012.00191 CSTR: 32189.14.SP.J.1077.2012.00191

ZnO和CaO含量对CaO-Al₂O₃-SiO₂系泡沫微晶玻璃析晶与发泡的影响

徐博¹, 曹建尉², 梁开明¹

(清华大学 1. 材料科学与工程系; 2. 化学系, 北京100084)

收稿日期:2011-01-14 修回日期:2011-04-22 出版日期:2012-02-10 网络出版日期:2012-01-05
作者简介:徐博(1982-), 男, 博士研究生. E-mail: xubo06@mails.tsinghua.edu.cn

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

摘要/Abstract

摘要：

以CaO-Al₂O₃-SiO₂玻璃为基体, 以石墨为发泡剂, 制备硅灰石基泡沫微晶玻璃, 研究了玻璃中引入ZnO和增加CaO含量对析晶与发泡的影响. 结果表明, ZnO可降低发泡过程中假硅灰石晶相的析出量, 促进玻璃粉与发泡剂混合物的烧结, 降低发泡剂在较低温度下的损耗. 提高CaO含量, 样品结晶度增大, 相同温度下玻璃的粘度增加, 发泡效率降低. 原料中ZnO加入量6wt%、CaO含量为18wt%的CaO-Al₂O₃-SiO₂玻璃粉, 较低温度下烧结充分, 发泡剂损耗相对较少, 在1000℃的发泡温度下可获得气孔率高的泡沫微晶玻璃.

关键词: 泡沫微晶玻璃, 硅灰石, 假硅灰石

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

中图分类号:

TB321

徐博, 曹建尉, 梁开明. ZnO和CaO含量对CaO-Al₂O₃-SiO₂系泡沫微晶玻璃析晶与发泡的影响[J]. 无机材料学报, 2012, 27(2): 191-194.

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.

图/表 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

图1 样品A、B、C的DTA曲线

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

图2 不同温度烧结的样品B的XRD图谱

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

图3 样品容重与烧结温度的关系

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

图4 不同温度烧结的泡沫微晶玻璃样品B的SEM照片

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

图5 不同温度烧结的样品A、B和C的XRD图谱

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

图6 不同温度烧结的泡沫微晶玻璃样品B的SEM照片

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

参考文献 8

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[6]	Xu B, Liang K M, Cao J W, et al. Preparation of foam glass ceramics from phosphorus slag. Adv. Mater. Res., 2010, 105-106: 600-603.
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ZnO和CaO含量对CaO-Al₂O₃-SiO₂系泡沫微晶玻璃析晶与发泡的影响

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

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