BAM Federal Institute for Materials Research and Testing, Unter den Eichen 87, 12205 Berlin, Germany.
Acta Biomater. 2010 Aug;6(8):3318-24. doi: 10.1016/j.actbio.2010.02.016. Epub 2010 Feb 16.
Femtosecond lasers provide a novel method of attaching bioceramic material to a titanium alloy, thereby improving the quality of bone implants. The ultrashort 30 fs laser pulses (790 nm wavelength) penetrate a thin dip-coated layer of fine ceramic powder, while simultaneously melting a surface layer of the underlying metal. The specific adjustment of the laser parameters (pulse energy and number of pulses per spot) avoids unnecessary melting of the bioactive calcium phosphate, and permits a defined thin surface melting of the metal, which in turn is not heated throughout, and therefore maintains its mechanical stability. It is essential to choose laser energy densities that correspond to the interval between the ablation fluences of both materials involved: about 0.1-0.4 Jcm(-2). In this work, we present the first results of this unusual technique, including laser ablation studies, scanning electron microscopy and optical microscope images, combined with EDX data.
飞秒激光为将生物陶瓷材料附着于钛合金表面提供了一种新方法，从而提高了骨植入物的质量。超短的 30fs 激光脉冲（790nm 波长）穿透了一层薄薄的涂覆有精细陶瓷粉末的薄膜，同时熔化了底层金属的表面层。激光参数（脉冲能量和每个光斑的脉冲数）的特定调整避免了生物活性磷酸钙的不必要熔化，并允许对金属进行定义明确的薄表面熔化，而金属本身不会整体受热，从而保持其机械稳定性。选择与两种材料的烧蚀通量之间的间隔相对应的激光能量密度至关重要：约为 0.1-0.4Jcm(-2)。在这项工作中，我们首次展示了这项独特技术的结果，包括激光烧蚀研究、扫描电子显微镜和光学显微镜图像以及 EDX 数据。
