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Materials Science in Additive Manufacturing Photocatalytic PA6/TiO powder for LPBF
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Table 2. Properties of PA6 and its TiO composite powders
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Parameter PA6 (125°C, 1 h, 50 g/L) PA6 (125°C, 1 h, 150 g/L) PA6/5% TiO PA6/10% TiO PA6/20% TiO
2 2 2
Bulk density 0.36±0.001 0.31±0.002 0.28±0.006 0.28±0.004 0.26±0.002
(g/cm )
3
Angle of repose (°) 30.39±0.29 30.75±0.45 29.77±0.68 26.62±0.5 25.96±0.73

A B

Figure 12. (A) Comparison of DSC curves between PA6 and its TiO composite powders indicating the changes in LPBF processability, and (B) the printed
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PA6 samples proving the LPBF processability.
4. Conclusion Funding
In this study, the PA6/TiO photocatalytic composite was The study was supported by National Natural Science
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prepared based on DPPC method, and its LPBF processability Foundation of China (52105341), China Postdoctoral Science
was investigated. The main conclusions are as follows: Foundation (2020M682406), Post-Doctoral Innovative
(i) Holding the crystallization precipitation temperature Research Post of Hubei Province (Post-doc No. 257963),
at 125°C for 1 h, nearly spherical PA6 powders with Fundamental Research Funds for the Central Universities
a particle size of 20–90 μm and a normal distribution (2019kfyRCPY044 and 2021GCRC002), Program for
peak of 49.3 μm can be obtained. HUST Academic Frontier Youth Team (2018QYTD04), and
(ii) Increasing the dissolved concentration of PA6 to Guangdong Provincial Enterprise Key Laboratory for 3D
150 g/L will increase the temperature gradient of the Printing Polymer and Composite Materials (2018B030323001).
reactor, resulting in a porous-surfaced powder and a
wide particle size distribution. Conflict of interest
(iii) PA6/TiO composite powder has a characteristic The authors declare that they have no known competing
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spherical porous-surfaced morphology, a high specific financial interests or personal relationships that could have
surface area of 240.5 m /kg, an appropriate Dv(50) of appeared to influence the work reported in this paper.
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48.8 μm, and a wide sintering window of 26.6°C, which
make it suitable for LPBF process and improvement of Author contributions
photocatalytic efficiency. Conceptualization: Peng Chen, Chunze Yan
This paper describes the preparation of a PA6/TiO Data curation: Zhaoqing Li, Haoze Wang
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powder material for LPBF additive manufacturing of Formal analysis: Zhaoqing Li, Jin Su
photocatalytic composites and also presents a novel idea Funding acquisition: Chunze Yan, Yusheng Shi
for the preparation of macro-micro 3D network TiO - Investigation: Sheng Liu, Haoze Wang
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based photocatalytic composites. Methodology: Peng Chen
Supervision: Chunze Yan, Yusheng Shi
Acknowledgments Validation: Sheng Liu, Jin Su
The authors would also like to thank the State Key Writing – original draft: Peng Chen
Laboratory of Materials Processing and Die and Mould Writing – review & editing: Peng Chen, Lei Yang, Chunze
Technology and the HUST Testing Center. Yan

Volume 1 Issue 3 (2022) 8 https://doi.org/10.18063/msam.v1i3.14