Effects of Sintering Aids (Y3+, La3+ and Mg2+) on the Optical Transmittance of Translucent Alumina Ceramic

doi:10.15541/jim20160682

Abstract

Abstract:

Translucent Al₂O₃ ceramics were prepared by vacuum sintering using Y³⁺, La³⁺ and Mg²⁺ as sintering aids which were introduced via chemical precipitation. Effects of the sintering aids on microstructure, relative density and optical transmittance of the translucent Al₂O₃ ceramics were investigated. The results show that the sintering aids are homogeneously dispersed in translucent Al₂O₃ ceramics. The optimal amount of the sintering aid introduced is Mg²⁺ (0.15wt%), Y³⁺ (0.05wt%) and La³⁺ (0.05wt%), and the corresponding sample shows the highest total forward transmittance (above 80% in the wavelength range of 350-800 nm). Moreover, the addition of Y³⁺ could promote grain growth and decrease porosity, thus the optical transmittance of the translucent Al₂O₃ ceramics is enhanced.

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Key words: translucent alumina ceramics, chemical precipitation, sintering aids, optical transmittance

CLC Number:

TQ174

YUAN Kang, LIAO Qi-Long, WANG Fu, DAI Yun-Ya, HUANG Jin-Shan. Effects of Sintering Aids (Y³⁺, La³⁺ and Mg²⁺) on the Optical Transmittance of Translucent Alumina Ceramic[J]. Journal of Inorganic Materials, 2017, 32(9): 1004-1008.

Figures/Tables 8

Table 1 Contents of sintering aids in the obtained samples

Samples	Content of sintering aids / wt%
Samples	Mg²⁺	Y³⁺	La³⁺
MYL-1	0.15	0	0.05
MYL-2	0.15	0.03	0.05
MYL-3	0.15	0.05	0.05
MYL-4	0.20	0.05	0.05
MYL-5	0.25	0.05	0.05

Fig. 1 Schematic and flow chart of the adopted chemical precipitation method

Fig. 2 XRD patterns of the obtained samples

Fig. 3 (a) The surface morphology of sample MYL-5, X-ray mapping of (b) Mg, (c) Y and (d) La for sample MYL-5

Fig. 4 Surface morphologies of the samples (a) MYL-1, (b) MYL-2, (c) MYL-3, (d) MYL-4, and (e) MYL-5

Fig. 5 Fracture surface morphologies of the samples (a) MYL-1; (b) MYL-2; (c) MYL-3; (d) MYL-4; (e) MYL-5

Fig. 6 Total forward transmittance spectra of all samples

Fig. 7 Photograph of all samples (a) MYL-1; (b) MYL-2; (c) MYL-3; (d) MYL-4; (e) MYL-5

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Effects of Sintering Aids (Y³⁺, La³⁺ and Mg²⁺) on the Optical Transmittance of Translucent Alumina Ceramic

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