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Title: Direct selective laser sintering of hexagonal barium titanate ceramics

Abstract

Abstract A 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 BaTiO 3 ceramics. The phase compositions in BaTiO 3 ceramics fabricated by SLS were investigated by X‐ray and neutron diffractions. The surface morphologies and cross‐section microstructures were characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). A dense hexagonal h‐BaTiO 3 layer was formed on the surface and extended to a depth of 500 μm, with a relative density higher than 97% and absence of pores or microcracks. SLS resulted in the formation of the high‐temperature phase, h‐BaTiO 3 , which was retained at room temperature possibly due to the high cooling rate. The grain boundaries of SLSed h‐BaTiO 3 ceramics consist of a Ti‐rich secondary phase. Compared with that of the pressureless sintered t‐BaTiO 3 ceramics, the Vickers hardness of SLSed h‐BaTiO 3 is 70% higher.

Authors:
 [1];  [1];  [2];  [2];  [1];  [3];  [4];  [5];  [5]; ORCiD logo [6]
  1. Department of Mechanical &, Materials Engineering University of Nebraska‐Lincoln Lincoln NE USA
  2. Department of Electrical &, Computer Engineering University of Nebraska‐Lincoln Lincoln NE USA
  3. Department of Nuclear Engineering Texas A&,M University TX USA
  4. Neutron Scattering Division Oak Ridge National Laboratory Oak Ridge TN USA
  5. Department of Physics and Astronomy University of Nebraska‐Lincoln Lincoln NE USA
  6. Department of Mechanical &, Materials Engineering University of Nebraska‐Lincoln Lincoln NE USA, Nebraska Center for Materials and Nanoscience University of Nebraska‐Lincoln Lincoln NE USA
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1787130
Resource Type:
Publisher's Accepted Manuscript
Journal Name:
Journal of the American Ceramic Society
Additional Journal Information:
Journal Name: Journal of the American Ceramic Society Journal Volume: 104 Journal Issue: 3; Journal ID: ISSN 0002-7820
Publisher:
Wiley-Blackwell
Country of Publication:
United States
Language:
English

Citation Formats

Zhang, Xiang, Wang, Fei, Wu, Zhipeng, Lu, Yongfeng, Yan, Xueliang, Nastasi, Michael, Chen, Yan, Hao, Yifei, Hong, Xia, and Cui, Bai. Direct selective laser sintering of hexagonal barium titanate ceramics. United States: N. p., 2020. Web. doi:10.1111/jace.17568.
Zhang, Xiang, Wang, Fei, Wu, Zhipeng, Lu, Yongfeng, Yan, Xueliang, Nastasi, Michael, Chen, Yan, Hao, Yifei, Hong, Xia, & Cui, Bai. Direct selective laser sintering of hexagonal barium titanate ceramics. United States. https://doi.org/10.1111/jace.17568
Zhang, Xiang, Wang, Fei, Wu, Zhipeng, Lu, Yongfeng, Yan, Xueliang, Nastasi, Michael, Chen, Yan, Hao, Yifei, Hong, Xia, and Cui, Bai. Fri . "Direct selective laser sintering of hexagonal barium titanate ceramics". United States. https://doi.org/10.1111/jace.17568.
@article{osti_1787130,
title = {Direct selective laser sintering of hexagonal barium titanate ceramics},
author = {Zhang, Xiang and Wang, Fei and Wu, Zhipeng and Lu, Yongfeng and Yan, Xueliang and Nastasi, Michael and Chen, Yan and Hao, Yifei and Hong, Xia and Cui, Bai},
abstractNote = {Abstract A 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 BaTiO 3 ceramics. The phase compositions in BaTiO 3 ceramics fabricated by SLS were investigated by X‐ray and neutron diffractions. The surface morphologies and cross‐section microstructures were characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). A dense hexagonal h‐BaTiO 3 layer was formed on the surface and extended to a depth of 500 μm, with a relative density higher than 97% and absence of pores or microcracks. SLS resulted in the formation of the high‐temperature phase, h‐BaTiO 3 , which was retained at room temperature possibly due to the high cooling rate. The grain boundaries of SLSed h‐BaTiO 3 ceramics consist of a Ti‐rich secondary phase. Compared with that of the pressureless sintered t‐BaTiO 3 ceramics, the Vickers hardness of SLSed h‐BaTiO 3 is 70% higher.},
doi = {10.1111/jace.17568},
journal = {Journal of the American Ceramic Society},
number = 3,
volume = 104,
place = {United States},
year = {Fri Nov 20 00:00:00 EST 2020},
month = {Fri Nov 20 00:00:00 EST 2020}
}

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