Back to Search Start Over

Effect of sintering temperature in argon atmosphere on microstructure and properties of 3D printed alumina ceramic cores

Authors :
He Li
Yongsheng Liu
Yansong Liu
Qingfeng Zeng
Kehui Hu
Zhigang Lu
Jingjing Liang
Source :
Journal of Advanced Ceramics, Vol 9, Iss 2, Pp 220-231 (2020)
Publication Year :
2020
Publisher :
Tsinghua University Press, 2020.

Abstract

Abstract Alumina ceramics with different sintering temperatures in argon atmosphere were obtained using stereolithography-based 3D printing. The effects of sintering temperature on microstructure and physical and mechanical properties were investigated. The results show that the average particle size, shrinkage, bulk density, crystallite size, flexural strength, Vickers hardness, and nanoindentation hardness increased with the increase in sintering temperature, whereas the open porosity decreased with increasing sintering temperature. No change was observed in phase composition, chemical bond, atomic ratio, and surface roughness. For the sintered samples, the shrinkage in Z direction is much greater than that in X or Y direction. The optimum sintering temperature in argon atmosphere is 1350 °C with a shrinkage of 3.0%, 3.2%, and 5.5% in X, Y, and Z directions, respectively, flexural strength of 26.7 MPa, Vickers hardness of 198.5 HV, nanoindentation hardness of 33.1 GPa, bulk density of 2.5 g/cm3, and open porosity of 33.8%. The optimum sintering temperature was 70 °C higher than that sintering in air atmosphere when achieved the similar properties.

Details

Language :
English
ISSN :
22264108 and 22278508
Volume :
9
Issue :
2
Database :
Directory of Open Access Journals
Journal :
Journal of Advanced Ceramics
Publication Type :
Academic Journal
Accession number :
edsdoj.4e1b66ef2f9940018fd0534f20d32386
Document Type :
article
Full Text :
https://doi.org/10.1007/s40145-020-0362-0