Influence of laser parameters and Ti content on the surface morphology of L-PBF fabricated Titania
ISSN: 1355-2546
Article publication date: 12 November 2020
Issue publication date: 8 January 2021
Abstract
Purpose
The purpose of this paper is to eliminate Part defects and enrich additive manufacturing of ceramics. Laser powder bed fusion (L-PBF) experiments were carried to investigate the effects of laser parameters and selective oxidation of Titanium (mixed with TiO2) on the microstructure, surface quality and melting state of Titania. The causes of several L-PBF parts defects were thoroughly analyzed.
Design/methodology/approach
Laser power and scanning speed were varied within a specific range (50–125 W and 170–200 mm/s, respectively). Furthermore, varying loads of Ti (1%, 3%, 5% and 15%) were mixed with TiO2, which was selectively oxidized with laser beam in the presence of oxygen environment.
Findings
Part defects such as cracks, pores and uneven grains growth were widely reduced in TiO2 L-PBF specimens. Increasing the laser power and decreasing the scanning speed shown significant improvements in the surface morphology of TiO2 ceramics. The amount of Ti material was fully melted and simultaneously changed into TiO2 by the application of the laser beam. The selective oxidation of Ti material also improved the melting condition, microstructure and surface quality of the specimens.
Originality/value
TiO2 ceramic specimens were produced through L-PBF process. Increasing the laser power and decreasing the scanning speed is an effective way to sufficiently melt the powders and reduce parts defects. Selective oxidation of Ti by a high power laser beam approach was used to improve the manufacturability of TiO2 specimens.
Keywords
Acknowledgements
This work was supported by National Key R&D Program of China (Nos 2017YFB1103000, 2016YFB1100504) and The National Natural Science Foundation of China (Nos 51375242).
Citation
Ullah, A., Wu, H., Ur Rehman, A., Zhu, Y., Liu, T. and Zhang, K. (2021), "Influence of laser parameters and Ti content on the surface morphology of L-PBF fabricated Titania", Rapid Prototyping Journal, Vol. 27 No. 1, pp. 71-80. https://doi.org/10.1108/RPJ-03-2020-0050
Publisher
:Emerald Publishing Limited
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