AP1234567 "Obtaning multifunctional calcium-phosphate coatings with titanium dioxide nanoparticles by plasma-electrolytic oxidation"

Supervisor:

Relevance:

In particular, commercial pure titanium and its alloys are widely used for dental implant applications due to their good mechanical properties, excellent corrosion resistance in biological fluids, and very low toxicity. Despite their attractive properties, implants made of Ti and its alloys usually exhibit low resistance to mechanical stress and aggressive environments that exist in the implant environment, and can be destroyed with simultaneous wear and corrosion. Recently, the plasma electrolytic oxidation (PEO) process has attracted considerable interest as a cost-effective, environmentally friendly, and highly efficient technology for depositing porous, wear- and corrosion-resistant ceramic films on Ti surfaces. Bioactive ceramics based on hydroxyapatite and calcium phosphates are promising due to their biocompatibility and similarity in composition to bone tissue. However, calcium phosphate PEO coatings exhibit poor tribological properties such as high and unstable coefficients of friction and low fretting wear resistance. Therefore, the inclusion of nano- and microparticles in the composition of coatings is considered as the most important strategy for improving the properties of PEO-coatings and expanding the range of their chemical composition.

Target:

Obtaining multifunctional calcium-phosphate PEO-coatings with TiO2 nanoparticles, having high corrosion and tribological characteristics and studying the features of degregation of their structure and properties under the synergistic effects of wear and corrosion.

Expectation:

1. On the basis of complex experimental studies, multifunctional coatings for implants will be obtained with high corrosion and tribological characteristics.
2. An installation for plasma-electrolytic oxidation will be created.
3. The effect of PEO technological parameters (voltage, current density, electrolyte flow rate, electrolyte temperature) on the elemental composition of the coatings will be studied.
4. A series of experiments will be carried out to obtain calcium phosphate PEO coatings with different content of TiO2 nanoparticles.
5. The optimal concentration of TiO2 nanoparticles in calcium phosphate PEO coatings will be determined, which is necessary to improve their corrosion and tribological characteristics and is safe for living organisms.
6. The features of degradation of the surface of bioactive calcium phosphate coatings with TiO2 nanoparticles under the combined effect of corrosion and wear in special solutions will be studied.
7. The role of TiO2 nanoparticles in improving the performance of bioactive calcium phosphate PEO coatings will be revealed.

Result:

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Study Team Members

  • Fullname: Касымов Аскар Багдатович, PhD

    Scopus Id: 56298368800

    Researcher Id: ---

    ORCID: 0000-0002-1983-6508

    Additionally:

  • Fullname: Кожанова Рауан Сабырбековна

    Scopus Id: 57216911622

    Researcher Id: ---

    ORCID: 0000-0002-3271-226_

    Additionally:

  • Fullname: Байжан Дарын Рашитұлы

    Scopus Id: 57214891142

    Researcher Id: ---

    ORCID: 0000-0002-9105-3129

    Additionally:

  • Fullname: Магазов Нуртолеу Магзумбекович

    Scopus Id: 57220041350

    Researcher Id: ---

    ORCID: 0000-0002-9941-9199

    Additionally: