Preparation and Property of β-eucryptite Ceramics Possessing Zero Coefficient of Thermal Expansion with CaO-B2O3 Glass as Sintering Aid

doi:10.15541/jim20170229

Abstract

Abstract:

β-eucryptite ceramics with zero coefficient of thermal expansion (CTE) were prepared via solid state reaction method, adding CaO-B₂O₃ glass (CB glass) as sintering aid. The thermal property of CB glass and the crystalline phase, micro-structure of β-eucryptite ceramic samples were investigated by differential scanning calorimetry (DSC), X-ray diffraction (XRD) and scanning electron microscope (SEM), respectively. The results indicate that CB glass is a good sintering aid. It significantly decreased the sintering temperature of β-eucryptite ceramics (from 1300℃ to 1150℃) and increased the relative bulk density (from 93.3% to 97.5%). No micro-cracks were found in β-eucryptite ceramics aided with CB glass. β-eucryptite ceramics added with 4wt%, 6wt% CB glass possessed zero CTE of 0.02×10^-6/K and 0.4×10^-6/K ranging from room temperature to 200℃, respectively. However, a new phase LiAlO₂ with extremely high positive CTE appears in the β-eucryptite ceramics added with 8wt% CB glass which leads to a positive CTE of 3.46×10^-6/K.

Key words: β-eucryptite;, CaO-B₂O₃ glass, micro-crack, coefficient of thermal expansion

CLC Number:

TQ174

YAO Xiao-Gang, REN Hai-Shen, JIANG Shao-Hu, ZHANG Yi, GU Zhong-Yuan, LIN Hui-Xing. Preparation and Property of β-eucryptite Ceramics Possessing Zero Coefficient of Thermal Expansion with CaO-B₂O₃ Glass as Sintering Aid[J]. Journal of Inorganic Materials, 2018, 33(4): 385-389.

Figures/Tables 6

Fig. 1 DSC curve of CB glass

Fig. 2 Relationship between bulk density of LCx (x=0, 2, 4, 6, 8) ceramic samples and sintering temperature

Table 1 Sintering temperature, density and thermal expansion coefficient of LCx (x=0, 2, 4, 6, 8) ceramic samples

Sample	T_s/℃	Density/(g•cm^-3)	CTE/(×10^-6, K^-1)
LC₀	1300	2.233	-4.59
LC₂	1250	2.287	-2.41
LC₄	1200	2.316	0.02
LC₆	1175	2.332	0.48
LC₈	1150	2.336	3.45

Fig. 3 Powder X-ray diffraction patterns of LCx(x=0, 6, 8) ceramic samples

Fig. 4 Cross section SEM images of LCx (x=0, 2, 4, 6, 8) ceramic samples

Fig. 5 (a) Thermal expansion curves of LCx(x=0, 2, 4, 6, 8) ceramic samples with (b) enlarged thermal expansion curves of LC4 and LC6 ceramic samples

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Preparation and Property of β-eucryptite Ceramics Possessing Zero Coefficient of Thermal Expansion with CaO-B₂O₃ Glass as Sintering Aid

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