Composition and structure of calcium-phosphate coatings on Ti3AlC2 produced by sol-gel synthesis

doi:10.26565/2222-5617-2022-36-03

K.I Sokol Physics Department, V.N. Karazin Kharkiv National University, Svobody Sq. 4, 61022, Kharkiv, Ukraine https://orcid.org/0000-0001-9135-7563
R.V. Vovk V.N. Karazin Kharkiv National University, Svobody Sq. 4, 61022, Kharkiv, Ukraine https://orcid.org/0000-0002-9008-6252
D.V. Rokhmistrov V.N. Karazin Kharkiv National University, Svobody Sq. 4, 61022, Kharkiv, Ukraine http://orcid.org/0000-0002-3650-5110
Yu.I. Boyko V.N. Karazin Kharkiv National University, Svobody Sq. 4, 61022, Kharkiv, Ukraine https://orcid.org/0000-0001-9243-724X
E.S. Gevorkyan Ukrainian State University of Railway Transport, 7 Feuerbach Sq., 61050 Kharkiv, Ukraine https://orcid.org/0000-0003-0521-3577
D.I. Sherban V.N. Karazin Kharkiv National University, Svobody Sq. 4, 61022, Kharkiv, Ukraine
S.I. Petrushenko V.N. Karazin Kharkiv National University, Svobody Sq. 4, 61022, Kharkiv, Ukraine https://orcid.org/0000-0002-7727-9527

DOI: https://doi.org/10.26565/2222-5617-2022-36-03

Keywords: Calcium phosphates, coating, Ti3AlC2, phase composition, microscopy

Abstract

Calcium phosphate materials have been widely used in medical practice for decades. Due to their bioactivity and integration with human hard tissues. They have been produced in the form of dense and porous ceramics, powders and needle-like crystals (whiskers). Despite the high mechanical properties (hardness, compressive strength), calcium phosphate ceramics are mainly used in medicine mainly as the fillers for bone defects formed due to injuries or diseases because they have high fragility and low crack resistance. These circumstances do not allow using them in the sites that have high mechanical loads (e.g. hip surgery). To solve these problems metal implants are used. Among them, Ti-based alloys are the most widely used due to its high mechanical properties, biocompatibility and high corrosion resistance. Recently, the data on the use of MAX phases as medical materials to create the composites based on Ti₃SiC₂ have appeared in the literature.

Calcium phosphate coatings were obtained on Ti₃AlC₂ substrate by the sol-gel method. The effect of temperature, holding time, chemical compositions of reactants on the phase composition and structure of the samples are discussed. XRD measurements have revealed that the initial coatings consists of nanoparticles sized 10-50 nm. Light and scanning electron microscopy (SEM) were applied to study the morphology of the coatings. It have been shown that the coatings had thickness in an interval 40-100 mm and had the homogenous structure. It has been established by X-ray phase identification that the coating after heating at 1000^oC during 1 hour contained b-tricalcium phosphate (b-TCP). It was found, that the thickness and phase composition of coatings depend on the time of coating in calcium phosphate solution. The optimal conditions for the formation of coatings are established.

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Composition and structure of calcium-phosphate coatings on Ti3AlC2 produced by sol-gel synthesis

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