Booth Leigh, Catledge Shane A, Nolen Dustin, Thompson Raymond G, Vohra Yogesh K
Department of Biomedical Engineering, The University of Alabama at Birmingham, Birmingham, AL 35294, USA.
Materials (Basel). 2011 May;4(5):857-867. doi: 10.3390/ma4050857.
With incredible hardness and excellent wear-resistance, nanocrystalline diamond (NCD) coatings are gaining interest in the biomedical community as articulating surfaces of structural implant devices. The focus of this study was to deposit multilayered diamond coatings of alternating NCD and microcrystalline diamond (MCD) layers on Ti-6Al-4V alloy surfaces using microwave plasma chemical vapor deposition (MPCVD) and validate the multilayer coating's effect on toughness and adhesion. Multilayer samples were designed with varying NCD to MCD thickness ratios and layer numbers. The surface morphology and structural characteristics of the coatings were studied with X-ray diffraction (XRD), Raman spectroscopy, and atomic force microscopy (AFM). Coating adhesion was assessed by Rockwell indentation and progressive load scratch adhesion tests. Multilayered coatings shown to exhibit the greatest adhesion, comparable to single-layered NCD coatings, were the multilayer samples having the lowest average grain sizes and the highest titanium carbide to diamond ratios.
纳米晶金刚石（NCD）涂层具有令人难以置信的硬度和出色的耐磨性，作为结构植入装置的关节表面，正受到生物医学界的关注。本研究的重点是使用微波等离子体化学气相沉积（MPCVD）在Ti-6Al-4V合金表面沉积交替的NCD和微晶硅金刚石（MCD）层的多层金刚石涂层，并验证多层涂层对韧性和附着力的影响。设计了具有不同NCD与MCD厚度比和层数的多层样品。用X射线衍射（XRD）、拉曼光谱和原子力显微镜（AFM）研究了涂层的表面形貌和结构特征。通过洛氏压痕和渐进加载划痕附着力试验评估涂层附着力。多层涂层显示出最大的附着力，与单层NCD涂层相当，是平均晶粒尺寸最低且碳化钛与金刚石比率最高的多层样品。
