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首页> 外文期刊>Acta biomaterialia >Compositionally graded hydroxyapatite/tricalcium phosphate coating on Ti by laser and induction plasma.
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Compositionally graded hydroxyapatite/tricalcium phosphate coating on Ti by laser and induction plasma.

机译：通过激光和感应等离子体在Ti上进行成分分级的羟基磷灰石/磷酸三钙涂层。

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In this study we report the fabrication of compositionally graded hydroxyapatite (HA) coatings on Ti by combining laser engineering net shaping (LENS) and radio frequency induction plasma spraying processes. Initially, HA powder was embedded in the Ti substrates using LENS, forming a Ti-HA composite layer. Later, RF induction plasma spraying was used to deposit HA on these Ti substrates with a Ti-HA composite layer on top. Phase analysis by X-ray diffraction indicated phase transformation of HA to beta-tricalcium phosphate in the laser processed coating. Laser processed coatings showed the formation of a metallurgically sound and diffused substrate-coating interface, which significantly increased the coating hardness to 922 +/- 183 Hv from that of the base metal hardness of 189 +/- 22 Hv. In the laser processed multilayer coating a compositionally graded nature was successfully achieved, however, with severe cracking and a consequent decrease in the flexural strength of the coating. To obtain a structurally stable coating with a composition gradient across the coating thickness a phase pure HA layer was sprayed on top of the laser processed single layer coatings using induction plasma spray. The plasma sprayed HA coatings were strongly adherent to the LENS-TCP coatings, with adhesive bond strength of 21 MPa. In vitro biocompatibility of these coatings, using human fetal osteoblast cells, showed a clear improvement in cellular activity from uncoated Ti compared with LENS-TCP-coated Ti and reached a maximum in the plasma sprayed HA coating.
机译：在这项研究中，我们报告了通过结合激光工程网成形（LENS）和射频感应等离子喷涂工艺在Ti上制备成分渐变的羟基磷灰石（HA）涂层的方法。最初，使用LENS将HA粉嵌入Ti衬底中，形成Ti-HA复合层。之后，使用RF感应等离子喷涂在这些Ti基板上沉积HA，并在其顶部放置Ti-HA复合层。通过X射线衍射进行的相分析表明在激光处理的涂层中HA向磷酸β-三钙的相变。激光处理的涂层显示出冶金学上良好且扩散的基材-涂层界面，这将涂层硬度从基础金属硬度189 +/- 22 Hv显着提高到922 +/- 183 Hv。然而，在激光加工的多层涂层中，成功地实现了成分渐变的性质，但出现了严重的开裂并因此降低了涂层的抗弯强度。为了获得在整个涂层厚度上具有组成梯度的结构稳定的涂层，使用感应等离子喷涂将相纯的HA层喷涂在激光处理的单层涂层的顶部。等离子喷涂的HA涂层牢固地粘附在LENS-TCP涂层上，粘合强度为21 MPa。与使用LENS-TCP涂层的Ti相比，使用人胎儿成骨细胞的这些涂层的体外生物相容性显示出未涂层的Ti的细胞活性明显改善，并且在等离子喷涂HA涂层中达到最大值。

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