In this work, a biomimetic coating of hydroxyapatite (HA)-and titania (TiO₂) was deposited on low elastic β-phase Ti-35Nb-7Ta-5Zr (β-TNTZ) alloy by plasma spray deposition technique for orthopedic applications. The effect of TiO₂ reinforcement on microstructure, mechanical properties, and bioactivity was investigated. The morphology, coating thickness, elemental composition, and phase composition of the developed coatings were characterized. The biomechanical behavior of the deposited coatings was investigated in terms of surface hardness, elastic modulus, and adhesion strength. It was found from the morphological investigation that the TiO₂ reinforcement improves the microstructure and prevents the formation of defects in the coating. The biomimetic HA-TiO₂ coated surface possessed pores, size ranging from 200 nm–600 nm that benefits the apatite growth and osseointegration. The EDS spectrum, mapping, and XRD analysis show that the deposited layer β-TCP, CaO, TTCP, TiO₂ phases. The HA-TiO₂ coating exhibits a very dense and thick layer of 100 µm–125 µm that exhibits excellent adhesion strength to offer mechanical interlocking to prevent delamination. The alloying of TiO₂ improves the hardness from 1.67 GPa to 2.95 GPa that enhances the wear resistance. It was found that HA-TiO₂ coating exhibits better hydrophilic and biocompatible surface as compared to HA-coating.

中文翻译：

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β-相Ti-35Nb-7Ta-5Zr髋关节茎上HA-TiO 2的等离子喷涂沉积：生物力学性能，润湿性和耐磨性的表征

在这项工作中，采用等离子喷涂技术在低弹性β相Ti-35Nb-7Ta-5Zr（β-TNTZ）合金上沉积了羟基磷灰石（HA）和二氧化钛（TiO ₂）的仿生涂层。研究了TiO ₂增强对微结构，力学性能和生物活性的影响。表征了所开发涂层的形态，涂层厚度，元素组成和相组成。根据表面硬度，弹性模量和粘附强度研究了沉积涂层的生物力学行为。从形态学研究发现，TiO ₂增强物改善了微观结构并防止了涂层中缺陷的形成。仿生HA-TiO_2个涂层表面具有孔，尺寸在200 nm–600 nm之间，有利于磷灰石的生长和骨整合。EDS光谱，作图和XRD分析表明，沉积层为β-TCP，CaO，TTCP，TiO ₂相。HA-TiO ₂涂层具有100 µm–125 µm的非常致密且较厚的涂层，具有出色的粘合强度，可提供机械互锁以防止分层。TiO ₂的合金化将硬度从1.67 GPa提高到2.95 GPa，从而提高了耐磨性。发现与HA涂层相比，HA-TiO ₂涂层表现出更好的亲水性和生物相容性表面。