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首页> 外文期刊>Journal of the mechanical behavior of biomedical materials >Laser cladding of bioactive glass coating on pure titanium substrate with highly refined grain structure
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Laser cladding of bioactive glass coating on pure titanium substrate with highly refined grain structure

机译：用高度精制晶粒结构激光纯钛基材上生物活性玻璃涂层的覆盖

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摘要

Free from toxic elements biomaterial potentially applicable for load bearing biomedical implants was obtained for the first time by laser cladding of S520 bioactive glass onto ultrafine-grained commercially pure titanium. The cladding process affected the refined structure of the substrate inducing martensitic transformation near its surface. The alpha' acicular martensite gradually passes into relatively large grains with increasing distance from the substrate surface, which subsequently are transformed into smaller grains of about 2 mu m in diameter. Both the melted zone, where the martensite crystalline structure was found, and the HAZ are characterised by relatively lower hardness in comparison with that of the substrate core indicating increased ductility. Such a combination of zones with different properties may have a synergistic effect and is beneficial for the obtained biomaterial. A characteristic region in the form of about 3 mu m width band was formed in the melted zone at about 10 mu m below the titanium surface. The results of EDS analysis indicate that several glass elements moved into the region while the titanium content in the same area was decreased. High bioactivity of the coated S520 glass was revealed by in vitro testing with SBF solution and almost complete reduction of P concentration occurred after 14 days.
机译：通过将S520生物活性玻璃激光熔覆到超细晶粒商业纯钛上，首次获得了无有毒元素的生物材料，该材料可能适用于承载生物医学植入物。熔覆工艺影响基体的精细结构，导致基体表面附近发生马氏体相变。随着与基体表面距离的增加，α'针状马氏体逐渐转变为相对较大的晶粒，随后转变为直径约为2μm的较小晶粒。与基体芯相比，发现马氏体晶体结构的熔化区和热影响区的硬度相对较低，表明延展性增加。具有不同性质的区域的这种组合可能具有协同效应，并且有益于获得的生物材料。在钛表面下方约10μm处的熔化区中形成了一个宽度约为3μm的特征区域。EDS分析结果表明，几个玻璃元素进入该区域，而同一区域的钛含量降低。用SBF溶液进行的体外试验表明，涂层S520玻璃具有很高的生物活性，14天后，P浓度几乎完全降低。

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