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首页> 外文期刊>Journal of Materials Research >A protocol to develop crack-free biomimetic coatings on Ti6Al4V substrates
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A protocol to develop crack-free biomimetic coatings on Ti6Al4V substrates

机译：在Ti6Al4V基材上开发无裂纹仿生涂层的协议

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Biomimetic coating of titanium and related alloys with carbonated apatitic calcium phosphate is an important area of research in implantology. While this paper specifically refers to coating Ti6Al4V, the results are valid with other related alloys as well. One step in the protocol involves an intermediate alkali treatment of Ti6Al4V to form a sodium titanate layer on the alloy surface. This pretreatment enhances the formation of the coating from simulated body fluid (SBF) solutions. Many papers in the biomimetic coating literature demonstrate the presence of cracks in coatings, irrespective of the SBF compositions and placement of the substrates. The presence of cracks may result in degradation and delamination of coatings. To the best of our knowledge, this issue remains unresolved. Therefore, the aim of this study was: (ⅰ) to examine and understand the reasons for cracking and (ⅱ) based on the results, to develop a protocol for producing crack-free apatitic calcium phosphate coatings on Ti6Al4V substrates. In this study, the authors focused their attention on the alkali treatment procedure and the final drying step. It is hypothesized that these two steps of the process affect the crack formation the most. In the first case, the surfaces of alkali-treated substrates were examined with/without water-soaking treatment before immersing in SBF. This water treatment modifies the sodium titanate surface layer. In the second case, two different drying techniques (after soaking in SBF) were used. In one procedure, the coated substrates were dried rapidly, and in the other they were dried slowly. It was observed that the water treatment, irrespective of the drying method, provides a surface, which on subsequent soaking in SBF forms a crack-free apatitic calcium phosphate coating. Based on these results, the authors suggest a protocol incorporating a water-soaking treatment after the alkali treatment and prior to the SBF soaking treatment to obtain crack-free coatings.
机译：用碳酸磷灰石磷酸钙对钛及其相关合金进行仿生涂层是移植学研究的重要领域。尽管本文专门提到了Ti6Al4V涂层，但该结果对其他相关合金也有效。方案中的一个步骤涉及对Ti6Al4V进行中间碱处理，以在合金表面形成钛酸钠层。这种预处理可增强由模拟体液（SBF）溶液形成的涂层。仿生涂料文献中的许多论文都证明了涂层中存在裂纹，而与SBF的组成和基材的放置无关。裂纹的存在可能导致涂层的降解和分层。就我们所知，此问题尚未解决。因此，本研究的目的是：（ⅰ）检查并了解裂纹的原因，（ⅱ）根据结果，开发出在Ti6Al4V基材上生产无裂纹的磷灰石磷酸钙涂层的方案。在这项研究中，作者将注意力集中在碱处理程序和最终干燥步骤上。假设该过程的这两个步骤对裂纹形成的影响最大。在第一种情况下，在浸入SBF之前对经过碱处理的基材表面进行了/不经过水浸泡处理。该水处理改变了钛酸钠表面层。在第二种情况下，使用了两种不同的干燥技术（在SBF中浸泡后）。在一种方法中，将涂覆的基材快速干燥，而在另一种中，将它们缓慢干燥。观察到，不管干燥方法如何，水处理均提供了表面，该表面随后在SBF中浸泡形成无裂纹的脂肪族磷酸钙涂层。基于这些结果，作者提出了一种方案，该方案在碱处理之后和SBF浸泡处理之前合并了浸泡处理以获得无裂纹的涂层。

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