Residual Amount of BaCO3 on Glass Thermal Property Based on BaO-CaO-Al2O3-B2O3-SiO2 System

doi:10.15541/jim20170411

Abstract

Abstract:

A BaO-CaO-Al₂O₃-B₂O₃-SiO₂system for the sealing glass in intermediate temperature solid oxide fuel cell (IT-SOFC) was prepared. The effects of three fusion processes (heating at 1300℃ for 1 h, heating at 1400℃ for 1 h, and heating at 1400℃ for 3 h) were explored with focus on the residual amount of BaCO₃and the thermal properties of the glasses by thermal-thermogravimetric analysis (DTA-TG). Samples were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffractometer (XRD) and thermal expansion coefficient meter. The results showed that 59wt% BaCO₃ retained undecomposed in the glass prepared via heat treatment at 1300℃ for 1 h and its expansion coefficient decreased due to devitrification of monoclinic BaAl₂Si₂O₈. Softening temperature (>800℃) of the glass produced via heating at 1400℃ for 3 h increased obviously owing to the increment of Al₂O₃amount. The expansion coefficient of the glass produced via heat treatment at 1400℃ for 1 h was 10.3×10^-6K^-1 from room temperature to the glass transition temperature, indiating the process of heat treatment at 1400℃ for 1 h the optimal condition in three candidates for the specific formula, which was found to be eligible for SOFC sealing.

Key words: barium carbonate, fusion, DTA-TG, thermal properties

CLC Number:

TQ174

LIU Liang-Guang, LUO Ling-Hong, WU Ye-Fan, CHEN Liang, XU Xu, WANG Le-Ying. Residual Amount of BaCO₃ on Glass Thermal Property Based on BaO-CaO-Al₂O₃-B₂O₃-SiO₂System[J]. Journal of Inorganic Materials, 2018, 33(8): 861-865.

Figures/Tables 9

Fig. 1 Schematic diagram of glass preparation process

Fig. 2 DTA-TG curves of the original formula powders

Fig. 3 DTA-TG curves of A glass powders

Table 1 Theoretical and realistic decomposition content of the initial powder prepared with formula

Initial ingredient (content/mg)	Product	Product quantity/mg	Theoretical total loss, M1/mg	Real total loss, M2/mg
BaCO₃(13.179)	CO₂	2.9384	5.9396	4.4120
CaCO₃(2.9286)	CO₂	1.2886
Na₂CO₃(0.2746)	CO₂	0.1140
H₃BO₃(3.6608)	H₂O	1.5986
H₃BO₃(3.6608)	B₂O₃	2.0610

Fig. 4 FT-IR spectra of BaCO3 and A glass powders

Fig. 5 TG curves of A, B and C samples

Fig. 6 Thermal expansion curves of the samples obtained under different process conditions

Table 2 Thermal parameters of glass under different processes

Process	Transition temperature, T_g/℃	Softening temperature, T_s/℃	Expansion coefficient, TEC/ (×10^-6, K^-1)
A	558	640	5.4
B	562	633	10.3
C	564	>800	10.9

Fig. 7 XRD patterns of A, B and C glass treated at 850℃ for 10 min

References 20

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Residual Amount of BaCO₃ on Glass Thermal Property Based on BaO-CaO-Al₂O₃-B₂O₃-SiO₂System

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