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27 results on '"Ouyang, Jiahu"'

5. Process and Mechanism of Removing Micro-Arc Oxidation Coating on Titanium Alloy by Plasma Electrolysis

Author

ZOU Yongchun, WANG Shuqi, WANG Yaming, CHEN Guoliang, ZHANG Kaiwei, OUYANG Jiahu, JIA Dechang, ZHOU Yu

Subjects
plasma electrolysis, coating removal, micro-arc oxidation, titanium alloy, Materials of engineering and construction. Mechanics of materials, TA401-492, Technology
Abstract

During the preparation and service process of micro-arc oxidation coatings，phenomena such as uneven growth or surface wear and peeling emerged，so the micro-arc oxidation coatings should be removed to achieve the purpose of secondary preparation and reuse.Aiming at the bottleneck problem of difficulty to remove micro-arc oxidation coating with high bonding strength，a novel plasma electrolytic removal(PER) technique was presented in this work.By comparing and analyzing the coating removal rates at different voltages，thickness change，and microstructure after coating removal at different times，it was found that the coating removal efficiency was the lowest with the applied voltage of 260 V，and the coating was completely removed after 11 min.When the voltage was increased to 320 V，the coating was completely removed in only 6 min.This was due to the large applied voltage，which made it easier to generate multiple and stable plasma discharge channels，thus realizing rapid removal of micro-arc oxidation coating.Furthermore，a synergistic mechanism of peeling，thinning，and dissolution in the removal of coatings by plasma electrolysis was proposed.The PER technique exhibits high efficiency and environmental protection，which has broad application prospects in the fields of aerospace，medical instruments and so on.

Published
2023
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18. High temperature oxidation and hot corrosion behaviors of PEO and PEO/polysilazane preceramic-based dual-layer coatings on Ti6Al4V alloy

Author

Wang, Shuqi, primary, Wang, Yaming, additional, Cao, Gui, additional, Chen, Cuoliang, additional, Zhu, Yixing, additional, Serdechnova, Maria, additional, Blawert, Carsten, additional, Zheludkevich, Mikhail L., additional, Zou, Yongchun, additional, Ouyang, Jiahu, additional, Jia, Dechang, additional, and Zhou, Yu, additional

Published
2023
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27. In situ reaction and solid solution induced hardening in (Ti,Zr)B2‐(Zr,Ti)C composites.

Author

Huo, Sijia, Wang, Yujin, Kong, Qingyi, Chen, Lei, Yao, Mianyi, Gu, Hui, Ouyang, Jiahu, Fu, Yudong, and Zhou, Yu

Subjects
SOLUTION strengthening, TITANIUM composites, FRACTURE toughness, HARDNESS, MICROSTRUCTURE, SOLID solutions, TEMPERATURE effect
Abstract

(Ti,Zr)B2‐(Zr,Ti)C ceramics were synthesized by reactive hot‐pressing and solid solution coupling effect using ZrB2 and TiC powders as starting materials. Effects of sintering temperature on phase relations, microstructure and mechanical properties were reported. The equimolar ZrB2 and TiC reactants ensured a complete in situ reaction to form (Ti,Zr)B2 and (Zr,Ti)C solid solutions. The (Ti,Zr)B2‐(Zr,Ti)C composite sintered at 1750°C was fully densified, and exhibited a high hardness of 29.1 GPa due to fine‐grain hardening and solid solution hardening. The optimized comprehensive mechanical properties such as a hardness of 27.9 GPa, a strength of 705 MPa and an indentation fracture toughness of 5.3 MPa m1/2 were achieved in (Ti,Zr)B2‐(Zr,Ti)C composites sintered at 1800°C for 1 hour. [ABSTRACT FROM AUTHOR]

Published
2020
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