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首页> 外文期刊>Acta biomaterialia >Laser processing of bioactive tricalcium phosphate coating on titanium for load-bearing implants.
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Laser processing of bioactive tricalcium phosphate coating on titanium for load-bearing implants.

机译：用于承重植入物的钛上生物活性磷酸三钙涂层的激光加工。

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摘要

Laser-engineered net shaping (LENS), a commercial rapid prototyping (RP) process, was used to coat titanium with tricalcium phosphate (TCP) ceramics to improve bone cell-materials interactions. During LENS coating process, the Nd:YAG laser melts the top surface of Ti substrate in which calcium phosphate powder is fed to create a TCP-Ti composite layer. It was found that an increase in laser power and/or powder feed rate increases the thickness of the coating. However, coating thickness decreased with increasing laser scan speed. TCP coating showed columnar titanium grains at the substrate side of the coating and transitioned to equiaxed titanium grains at the outside. When the scan speed was reduced from 15 to 10mms(-1), coating hardness increased from 882+/-67 to 1049+/-112Hv due to an increase in the volume fraction of TCP in the coating. Coated surfaces showed uniformly distributed TCP particles and X-ray diffraction data confirmed the absence of any undesirable phases, while maintaining a high level of crystallinity. The effect of TCP coating on cell-material interaction was examined by culturing osteoprecursor cells (OPC1) on coated surfaces. The results indicated that TCP coating had good biocompatibility where OPC1 cells attached and proliferated on the coating surface. The coating also initiated cell differentiation, ECM formation and biomineralization.
机译：激光工程网成形（LENS）是一种商业快速成型（RP）工艺，用于用磷酸三钙（TCP）陶瓷涂覆钛，以改善骨细胞与材料之间的相互作用。在LENS镀膜过程中，Nd：YAG激光熔化钛基板的上表面，并在其中馈入磷酸钙粉末以形成TCP-Ti复合层。已经发现，激光功率和/或粉末进料速率的增加增加了涂层的厚度。但是，涂层厚度随着激光扫描速度的增加而降低。 TCP涂层在涂层的基体一侧显示出柱状钛晶粒，并在外部转变成等轴的钛晶粒。当扫描速度从15mms（-1）降低到10mms（-1）时，由于涂层中TCP体积分数的增加，涂层硬度从882 +/- 67增至1049 +/- 112Hv。涂层表面显示出均匀分布的TCP颗粒，X射线衍射数据证实了不存在任何不良相，同时保持了较高的结晶度。通过在涂层表面上培养骨前体细胞（OPC1），检查了TCP涂层对细胞-材料相互作用的影响。结果表明TCP涂层具有良好的生物相容性，其中OPC1细胞在涂层表面附着并增殖。涂层还引发细胞分化，ECM形成和生物矿化。

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