Direct selective laser sintering of hexagonal barium titanate ceramics Academic Article uri icon

abstract

  • AbstractA direct selective laser sintering (SLS) process was combined with a laser preheating procedure to decrease the temperature gradient and thermal stress, which was demonstrated as a promising approach for additive manufacturing of BaTiO3 ceramics. The phase compositions in BaTiO3 ceramics fabricated by SLS were investigated by Xray and neutron diffractions. The surface morphologies and crosssection microstructures were characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). A dense hexagonal hBaTiO3 layer was formed on the surface and extended to a depth of 500m, with a relative density higher than 97% and absence of pores or microcracks. SLS resulted in the formation of the hightemperature phase, hBaTiO3, which was retained at room temperature possibly due to the high cooling rate. The grain boundaries of SLSed hBaTiO3 ceramics consist of a Tirich secondary phase. Compared with that of the pressureless sintered tBaTiO3 ceramics, the Vickers hardness of SLSed hBaTiO3 is 70% higher.

published proceedings

  • JOURNAL OF THE AMERICAN CERAMIC SOCIETY

author list (cited authors)

  • Zhang, X., Wang, F., Wu, Z., Lu, Y., Yan, X., Nastasi, M., ... Cui, B.

citation count

  • 16

complete list of authors

  • Zhang, Xiang||Wang, Fei||Wu, Zhipeng||Lu, Yongfeng||Yan, Xueliang||Nastasi, Michael||Chen, Yan||Hao, Yifei||Hong, Xia||Cui, Bai

publication date

  • March 2021

publisher