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首页> 外文期刊>RSC Advances >Tough and adhesive nanostructured calcium phosphate thin films deposited by the pulsed plasma deposition method
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Tough and adhesive nanostructured calcium phosphate thin films deposited by the pulsed plasma deposition method

机译：坚韧且粘合的纳米结构钙磷酸钙薄膜通过脉冲等离子体沉积方法沉积

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摘要

Calcium phosphate (CaP) coatings are commonly employed to improve the bioactivity of bone and dental metal implants, due to the chemical-physical similarity with the mineral phase of bone, envisaged to enhance the integration with the surrounding bone tissue. However, growing concerns about the use of commercial thick CaP coatings, mainly related to their weak mechanical properties, poor interface strength and micro-structural inhomogeneity, are leading the investigation of new and alternative CaP deposition techniques. In this study the feasibility to deposit tough and well adherent CaP thin films by a novel Pulsed Plasma Deposition (PPD) method on Ti alloy was investigated. Microstructural, chemical and morphological properties of the coatings as well as the nano-mechanical properties and their adhesion to the Ti-alloy substrate were extensively characterized. In vitro biocompatibility was also preliminary assessed evaluating the adhesion and proliferation of primary mouse osteoblasts. As-deposited CaP films were amorphous and exhibited dense and uniform surface composed of sub-micrometric aggregated globular particles. Noteworthy, mechanical properties of as-deposited films were comparable to the ones of commercial plasma-sprayed coatings despite the significant difference of thickness (a few hundred nanometers vs. tens of micrometers). After the thermal annealing of the as deposited films at 600 degrees C for 1 h in air, a transformation from amorphous calcium phosphate to crystalline hydroxyapatite (HA) phase occurred. The mechanical properties as well as the adhesion to substrate of the annealed films strongly improved respect to those of the as deposited films, displaying interesting high hardness, elastic strain to failure and plastic deformation resistance values. Finally, biological in vitro tests indicated good biocompatibility of both as-deposited and annealed films, with this latter showing better cells adhesion and proliferation compared to the former.
机译：磷酸钙（帽）涂层通常用于改善骨和牙科金属植入物的生物活性，由于与骨的矿物相的化学物理相似性，设想，以增强与周围骨组织的整合。然而，对商业厚帽涂层的使用越来越多的担忧，主要与其弱机械性能，较差的界面强度和微结构不均匀性有关，这导致了对新的和替代帽沉积技术的研究。在这研究中，研究了通过新型脉冲等离子体沉积（PPD）方法在Ti合金上沉积坚韧和良好的粘附帽薄膜的可行性。涂层的微观结构，化学和形态学性质以及纳米机械性能及其对Ti合金基底的粘附性。体外生物相容性也初步评估了原发性小鼠成骨细胞的粘附和增殖。沉积的帽膜是无定形的，并且表现出由亚微米聚集的球状颗粒组成的致密和均匀的表面。值得注意的是，尽管厚度的显着差异（几百纳米与数微米）的显着差异，但沉积薄膜的机械性能与商业等离子体喷涂涂层相当。在空气中以600℃的600℃的沉积膜的热退火之后，发生从非晶磷酸钙到结晶羟基磷灰石（HA）相的转化。机械性能以及退火膜的基材的粘附力强大地改善了作为沉积膜的那些，表现出有趣的高硬度，弹性应变为失效和塑性变形电阻值。最后，生物体外试验表明，沉积和退火薄膜的良好生物相容性，后者显示出与前者相比的更好的细胞粘附和增殖。

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