J. Mater. Sci. Technol. ›› 2016, Vol. 32 ›› Issue (4): 320-325.DOI: 10.1016/j.jmst.2015.11.017

Special Issue: 增材制造/3D打印专辑

• Orignal Article • Previous Articles     Next Articles

Microstructure and Mechanical Properties of Al2O3/ZrO2 Directionally Solidified Eutectic Ceramic Prepared by Laser 3D Printing

Zhi Liu1, Kan Song2, Bo Gao1, *, Tian Tian1, Haiou Yang2, Xin Lin2, Weidong Huang2   

  1. 1 State Key Laboratory of Military Stomatology, Department of Prosthodontics, School of Stomatology, Fourth Military Medical University, Xi'an 710032, China;
    2 State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
  • Received:2015-01-15 Revised:2015-04-28 Online:2016-04-10
  • Contact: Prof., Ph.D.; Tel.: +86 29 84776469; Fax: +86 29 84776469. (B. Gao).
  • Supported by:
    The authors would like to thank the National Natural Science Foundation of China (No. 81170983) and China Postdoctoral Science Foundation (No. 2015M572597).

Abstract: Directionally solidified eutectic ceramics such as Al2O3/ZrO2 are promising structural materials for applications in harsh environment with an ultrahigh temperature. In this work, through adopting assistant heating laser 3D printing, Al2O3/ZrO2 eutectic samples were manufactured with suppressing the formation of cracks. The dependence of the average rod spacing (λav) on the scanning rate (V) follows a relation with λavV0.5 = 1 µm1.5 s-0.5. Typical eutectic microstructures, so-called complex regular, were analyzed with respect to its evolution with modulating the growth conditions. Formation mechanism of the solidification defect, shrinkage porosity, was discussed and the defect is found to be significantly suppressed by optimizing the solidification parameters. The maximum hardness and fracture toughness are measured to be 16.7 GPa and 4.5 MPa m1/2, respectively. The interplay between the propagation of cracks and the Al2O3/ZrO2 interface is discussed.

Key words: Al2O3, ZrO2, Eutectic, Solidification