Acta Metallurgica Sinica (English Letters) ›› 2020, Vol. 33 ›› Issue (2): 204-214.DOI: 10.1007/s40195-019-00950-y

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  • 收稿日期:2019-06-03 修回日期:2019-07-01 出版日期:2020-02-10 发布日期:2020-03-23

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

He Li1, Yongsheng Liu1(), Yansong Liu1, Kehui Hu2,3, Zhigang Lu2,3, Jingjing Liang4   

  1. 1. Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi’an, 710072, China
    2. Department of Mechanical Engineering, Tsinghua University, Beijing, 100084, China
    3. State Key Laboratory of Tribology, Tsinghua University, Beijing, 100084, China
    4. Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, ChinaAuthors
  • Received:2019-06-03 Revised:2019-07-01 Online:2020-02-10 Published:2020-03-23
  • Contact: Liu Yongsheng

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