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Direct selective laser sintering of hexagonal barium titanate ceramics
Journal of the American Ceramic Society ( IF 3.5 ) Pub Date : 2020-11-05 , DOI: 10.1111/jace.17568
Xiang Zhang 1 , Fei Wang 1 , Zhipeng Wu 2 , Yongfeng Lu 2 , Xueliang Yan 1 , Michael Nastasi 3 , Yan Chen 4 , Yifei Hao 5 , Xia Hong 5 , Bai Cui 1, 6
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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 BaTiO3 ceramics. The phase compositions in BaTiO3 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‐BaTiO3 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‐BaTiO3, which was retained at room temperature possibly due to the high cooling rate. The grain boundaries of SLSed h‐BaTiO3 ceramics consist of a Ti‐rich secondary phase. Compared with that of the pressureless sintered t‐BaTiO3 ceramics, the Vickers hardness of SLSed h‐BaTiO3 is 70% higher.

中文翻译:

六方晶钛酸钡陶瓷的直接选择性激光烧结

直接选择性激光烧结(SLS)工艺与激光预热程序相结合以降低温度梯度和热应力,这被证明是增材制造BaTiO 3陶瓷的一种有前途的方法。通过X射线和中子衍射研究了SLS制备的BaTiO 3陶瓷中的相组成。通过扫描电子显微镜(SEM)和透射电子显微镜(TEM)对表面形貌和横截面显微结构进行了表征。在表面上形成了致密的六角形h-BaTiO 3层,并延伸到500μm的深度,相对密度高于97%,并且没有孔或微裂纹。SLS导致高温相h-BaTiO的形成如图3所示,其可能由于高冷却速率而保留在室温下。SLSed h-BaTiO 3陶瓷的晶界由富钛的第二相组成。与无压力烧结t-BaTiO 3陶瓷相比,SLSed h-BaTiO 3的维氏硬度高70%。
更新日期:2020-12-30
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