Supervisor:
Southwest Ordnance Industry Bureau
Organizer:
Chongqing Ordnance Industry Society
Chongqing University of Technology
Chongqing University of Technology
Effect of Pr(NO3)3 doping on the organization and performance of TC4 micro arc oxidation coatings
| DOI: | 10.11809/bqzbgcxb2023.01.034 |
| Keywords: | TC4; wear resistance; biological activity; TiO2 coating |
| Abstract: | In view of the biological inertia and poor wear resistance of TC4 titanium alloy, in this paper, TiO 2 coatings containing bioactive hydroxyapatite are synthesized directly on titanium alloy surface by a one step method. The influences of Pr(NO3)3 doping on the phase composition, microstructure, microhardness, friction coefficient and coating adhesion of TC4 micro arc oxidation coatings are studied by doping Pr(NO3)3 into (CH3COO)2Ca (NaPO3)6 system. The results show that TiO2 coatings containing hydroxyapatite (HA) can be directly generated on the surface of TC4 alloy by micro arc oxidation coating technology in the electrolyte system of (CH3COO)2Ca (NaPO3) 6 through electrolyte optimization, which is helpful to improve its biological activity. Compared with the coatings without doping Pr(NO3)3, the micro hardness of the micro arc oxidation coatings with appropriate doping content is improved. When the doping amount of Pr(NO3)3 reaches 1.0 g/L, the microhardness of the coating reaches the maximum value, which is about 278.8±2.6HV1. At the same time, the friction coefficient of the obtained coating is the smallest, between 0.25 and 0.35. When the doping amount of Pr(NO3)3 in the electrolyte reaches 1.5 g/L, the bonding force of the micro arc oxidation coating is the highest at about 11.2 N, and the wear resistance of the coating is the best. The wear resistance of the coating can be improved by properly introducing Pr(NO3)3 doping into the micro arc oxidation electrolyte. |
| Published: | 2023-01-28 |
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