Bioactive Polymer-apatite Coatings with Antimicrobial Properties on Model Titanium Implants

Sukhodub, L. F.; Sukhodub, Leonid Fedorovych; Kumeda, Mariia; Denysenko, Anastasiia; Kravchenko, M. I.

doi:10.21272/jnep.12(3).03025

Cited by 1 publication

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“…In this regard, research is being carried out aimed at improving the wear resistance of titanium alloys through surface hardening and protective coatings deposition. Various methods of surface engineering are used for this purpose, including PVD [4], DLC coating [5], electric-spark deposition [6], high-frequency work hardening [7], ions bombarding [8], thermal substrate deposition [9] and many others.…”

Section: Introductionmentioning

confidence: 99%

Surface Laser Melting of a Carburized LPBF-manufactured Ti-based Biomedical Grade Alloy

Efremenko,

Chabak,

Tsvetkova

et al. 2023

J. Nano- Electron. Phys.

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The object of this work is a study of the microstructure and hardness evolution of LPBF-manufactured biomedical alloy Ti-6Al-4V superficially modified by pack carburization and subsequent laser melting. Carburization was conducted in a powder of (NH2)2CO (20 vol. %), K4Fe(CN)6 (20 vol. %), and a carbon black (60 vol. %) at 1000 C (7 hours). The laser processing was fulfilled by fiber laser «TruFiber 400» (TRUMPF) of 1064 nm wavelength with a power of 400 W and scanning velocity of 5 mmsec -1 . The investigations included optical (GX71 OLYMPUS) and scanning electron microscopy observations (JSM-7000F JEOL), energy-dispersive X-ray spectroscopy (INCAx-sight, Oxford Instruments), X-ray diffraction (X'Pert PRO, PANalytical, Cu-K radiation) and microhardness measurement (LM700AT LECO, under the load of 0.05 kg). It was found that carburization resulted in a 440-700 m deep carbonrich layer of Ti with an upper thin layer comprising TiC, TiO2, and Al2O3. Carburization led to 720  12 HV in a near-surface layer which is two times the bulk structure (322  32 HV). A consequent laser scanning formed a 60-120 m wide melted layer followed by the heat-affected zone (having a needle-like Ti-martensite) extended to  0.8 mm depth. The melted layer had a fine-grained structure which included the dispersive particles of an oxycarbide Ti(O0.8C0.2) of both grainy and dendrite-like shapes. Consequently, the hardness of the melted layer rose up to 1000-1200 HV with a further gradual decrease, according to the declining carbon content profile. Laser melting was accompanied by cracks and shrinkage cavities formation. It also led to an increased roughness of the surface caused by its boiling under the laser melting.

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