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Laser-assisted thermochemical ultrahigh-precision polishing of titanium in phosphoric acid solution

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Abstract

Surface finish is one of the most important quality characteristics of titanium implants in the medical field. In this paper, a laser-assisted thermochemical polishing system based on scanning galvanometer was designed and built for the ultrahigh-precision polishing of titanium. The influence of the laser processing parameters and initial surface roughness of the workpiece on the final polishing results were systematically studied, and the polishing mechanisms were discussed. The results show that the final polishing quality was closely related to the laser pulse energy, spot overlapping rate, scanning times, and properties of the material itself but not to the initial surface roughness of the workpiece. In addition, the laser destroyed the passivation layer on the surface of the workpiece, resulting in direct contact between the titanium and etching solution. On the other hand, it induced the generation of a thermo-electromotive force, which caused the electrochemical corrosion on the workpiece surface, accelerating the dissolution of peaks on the surface of the material. The workpiece surface finish was improved because of the difference between the material dissolution rates of the peaks and valleys. Finally, ultrahigh-precision polishing of a commercially pure titanium surface was achieved using the optimized process parameters.

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Funding

This work was supported by the National Natural Science Foundation of China [grant No. 51775289]; the Major Basic Research Program of the Natural Science Foundation of Shandong, China [grant No. ZR 2018ZB0524]; the Shandong Key R&D Program [grant Nos. 2019GGX104097, 2019JZZY010402, 2019GGX104106, and GG201809140095]; the Applied Basic Research Program of Qingdao [grant No. 17-1-1-91-jch]; and the 111 Project [grant No. D21017].

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Authors and Affiliations

  1. School of Mechanical & Automotive Engineering, Qingdao University of Technology, Qingdao, 266520, China

    Yong Shao, Shu-Feng Sun, Guo-Liang Liu, Jing Shao, Feng-Yun Zhang & Xi Wang

  2. Collaborative Innovation Center for Green Intelligent Laser Manufacturing Technology and Equipment of Shandong Province, Qingdao, 266520, China

    Yong Shao, Shu-Feng Sun, Ping-Ping Wang, Jing Shao, Feng-Yun Zhang & Xi Wang

  3. Shandong Research Center of Laser Green and High Efficiency Intelligent Manufacturing Engineering Technology, Qingdao University of Technology, Qingdao, 266520, China

    Yong Shao, Shu-Feng Sun, Ping-Ping Wang, Jing Shao, Feng-Yun Zhang & Xi Wang

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  1. Yong Shao
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  2. Shu-Feng Sun
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  3. Guo-Liang Liu
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  4. Ping-Ping Wang
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  5. Jing Shao
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  7. Xi Wang
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Contributions

SS, YS, and JS contributed to the conception of the study and experimental devices.

YS, PW, and FZ performed all the experiments and roughness measurements.

YS performed data analyses and wrote the manuscript.

GL and XW contributed to perfecting the language.

Corresponding author

Correspondence to Shu-Feng Sun.

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All authors have agreed to submit and publish this manuscript in The International Journal of Advanced Manufacturing.

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The authors declare no competing interests.

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Shao, Y., Sun, SF., Liu, GL. et al. Laser-assisted thermochemical ultrahigh-precision polishing of titanium in phosphoric acid solution. Int J Adv Manuf Technol 115, 1201–1210 (2021). https://doi.org/10.1007/s00170-021-07267-0

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  • DOI: https://doi.org/10.1007/s00170-021-07267-0

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