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首页> 外文期刊>Acta biomaterialia >Synthesis and properties of hydroxyapatite-containing porous titania coating on ultrafine-grained titanium by micro-arc oxidation.
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Synthesis and properties of hydroxyapatite-containing porous titania coating on ultrafine-grained titanium by micro-arc oxidation.

机译：微弧氧化法在超细晶粒钛上含羟基磷灰石多孔二氧化钛涂层的合成及性能。

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摘要

Equal channel angular pressing results in ultrafine-grained (approximately 200-500 nm) Ti with superior mechanical properties without harmful alloying elements, which benefits medical implants. To further improve the bioactivity of Ti surfaces, Ca/P-containing porous titania coatings were prepared on ultrafine-grained and coarse-grained Ti by micro-arc oxidation (MAO). The phase identification, composition, morphology and microstructure of the coatings and the thermal stability of ultrafine-grained Ti during MAO were investigated subsequently. The amounts of Ca, P and the Ca/P ratio of the coatings formed on ultrafine-grained Ti were greater than those on coarse-grained Ti. Nanocrystalline hydroxyapatite and alpha-Ca(3)(PO(4))(2) phases appeared in the MAO coating formed on ultrafine-grained Ti for 20 min (E20). Incubated in a simulated body fluid, bone-like apatite was completely formed on the surface of E20 after 2 days, thus evidencing preferable bioactivity. Compared with initial ultrafine-grained Ti, the microhardness of the E20 substrate was reduced by 8% to 2.9 GPa, which is considerably more than that of coarse-grained Ti (approximately 1.5 GPa).
机译：等通道角挤压可产生具有优异机械性能且无有害合金元素的超细晶粒（约200-500 nm）钛，这对医疗植入物有利。为了进一步提高Ti表面的生物活性，通过微弧氧化（MAO）在超细晶粒和粗晶粒Ti上制备了含Ca / P的多孔二氧化钛涂层。随后研究了MAO过程中涂层的相识别，组成，形貌和微观结构以及超细晶Ti的热稳定性。在超细晶粒Ti上形成的涂层的Ca，P的量和Ca / P比大于在粗晶粒Ti上形成的涂层。纳米晶羟基磷灰石和α-Ca（3）（PO（4））（2）相出现在超细晶粒Ti上形成的MAO涂层中持续20分钟（E20）。在模拟的体液中孵育2天后，在E20的表面上完全形成了骨状磷灰石，因此具有较好的生物活性。与初始超细晶粒Ti相比，E20基材的显微硬度降低了8％，为2.9 GPa，这比粗晶粒Ti（约1.5 GPa）要大得多。

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