- Влияние соотношения газов C₂H₂/O₂ на структуру, механические свойства и адгезионную прочность биокомпозиционных покрытий HAp/Ti, полученных методом детонационного напыления
Влияние соотношения газов C₂H₂/O₂ на структуру, механические свойства и адгезионную прочность биокомпозиционных покрытий HAp/Ti, полученных методом детонационного напыления
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Keywords:
детонационное напыление, гидроксиапатит, биокомпозиционные покрытия HAp/Ti, соотношение газов C₂H₂/O₂, микроструктура, механические свойства, адгезионная прочность.Abstract
This paper presents the results of a study of biocomposite coatings based on hydroxyapatite (HAp) and titanium, produced by detonation spraying using a CCDS-2000 system. The aim of the study was to determine the effect of the C₂H₂/O₂ gas ratio during detonation spraying on the structure, phase composition, mechanical properties, and adhesive strength of the HAp/Ti biocomposite coatings. The substrate was a titanium alloy, Ti13Nb13Zr, pre-treated with air abrasives to enhance coating adhesion.
Comprehensive coating studies were conducted using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray diffraction (EDS), nanoindentation, and scratch testing. It was found that varying detonation spraying conditions significantly affects the coating thickness, phase distribution uniformity, and mechanical properties. The densest and most uniform structure was formed under optimized spraying conditions, which ensured increased nanohardness, cohesive strength, and adhesion resistance of the coatings.
Elemental mapping confirmed the formation of a gradient structure in the Ti/HAp coatings, with a gradual transition from metallic layers to calcium phosphate phases. X-ray diffraction analysis revealed the presence of predominantly CaO and TiO₂ phases, with hydroxyapatite components remaining after spraying. Maximum adhesive strength and coating stability were obtained for samples formed under the optimal C₂H₂/O₂ gas ratio.
Regularities in the influence of the C₂H₂/O₂ gas ratio on the structure formation and performance properties of the coatings were established, enabling optimization of detonation spraying conditions to produce coatings with improved performance.
The obtained results indicate the high potential of detonation spraying for the creation of biocompatible functionally graded coatings intended for medical implants and bone tissue bioengineering applications.
