| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Manufacturing and Processing of Advanced Ceramic Materials
|
| Presentation Title |
Selective Laser Sintering of Hexagonal Barium Titanate Ceramics |
| Author(s) |
Xiang Zhang, Fei Wang, Zhipeng Wu, Yongfeng Lu, Yan Chen, Michael Nastasi, Bai Cui |
| On-Site Speaker (Planned) |
Bai Cui |
| Abstract Scope |
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. 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. A dense hexagonal h-BaTiO3 layer was formed on the surface and extended to a depth of 500 μm, with a relative density of higher than 97% and absence of pores or microcracks. 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 was 70% higher. |