Influence of Sintering Temperature on Microstructure and Mechanical Properties of Al2O3 Ceramic via 3D Stereolithography

doi:10.1007/s40195-019-00950-y

Abstract

Abstract:

In this work, aluminum oxide (Al₂O₃) ceramic samples were fabricated by 3D stereolithography printing. Printing process was followed by debinding and sintering. In addition, the effect of sintering temperature on microstructure and properties was investigated. Flexure strength was observed to increase with increasing sintering temperature due to fewer pores, fewer defects and stronger grain boundary bonding of samples at higher sintering temperatures. Maximum flexure strength of 138.5 MPa was obtained when sintering temperature was 150 °C. Furthermore, the shrinkage along length direction decreased with the decreasing sintering temperature until reaching minimum value of 1.02% after sintering at 1200 °C. After sintering at 1280 °C, flexure strength was 24.0 MPa and the shrinkage along length direction was 2.1%, which meets demands of ceramic core.

Key words: Stereolithography, Aluminum oxide, Sintering temperature, Shrinkage, 3D

He Li, Yongsheng Liu, Yansong Liu, Kehui Hu, Zhigang Lu, Jingjing Liang. Influence of Sintering Temperature on Microstructure and Mechanical Properties of Al₂O₃ Ceramic via 3D Stereolithography[J]. Acta Metallurgica Sinica (English Letters), 2020, 33(2): 204-214.

Figures/Tables 15

Table 1 Classification of ceramic cores [8]

Fig. 1 Particle size distribution of Al2O3 powders and the SEM image of Al2O3 powders

Fig. 2 Debinding and sintering process of the green bodies

Fig. 3 Shrinkage of the sintered samples in different directions

Fig. 4 Variation of the open porosity, water absorption, bulk density and relative density of the sintered samples: a open porosity; b water absorption; c bulk density; d relative density with temperature

Fig. 5 SEM images of the green body and of the samples sintered at different temperatures: a green body; b 1200 °C; c 1250 °C; d 1280 °C; e 1300 °C; f 1350 °C; g 1400 °C; h 1450 °C; i 1500 °C

Fig. 6 TEM images of the green body and of the samples sintered at different temperatures: a green body; b 1200 °C; c 1250 °C; d 1280 °C; e 1300 °C; f 1350 °C; g 1400 °C; h 1450 °C; i 1500

Fig. 7 XRD patterns of the green body and of the samples sintered at different temperatures

Fig. 8 Crystallite size of the samples sintered at different sintered temperatures

Fig. 9 EDS patterns of the green body and samples sintered at different temperatures: a green body; b 1200 °C; c 1250 °C; d 1280 °C; e 1300 °C; f 1350 °C; g 1400 °C; h 1450 °C; i 1500 °C

Table 2 Atom ratio (EDS) of different sintered samples

Fig. 10 XPS spectra of the green body and samples sintered at different temperatures

Table 3 Atom ratio (XPS) of different sintered samples

Fig. 11 Flexure strength of the samples sintered at different temperatures

Fig. 12 Printed alumina ceramic core

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Influence of Sintering Temperature on Microstructure and Mechanical Properties of Al₂O₃ Ceramic via 3D Stereolithography

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