• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >Nanocrystalline diamond thin films on titanium-6 aluminum-4 vanadium alloy temporomandibular joint prosthesis simulants by microwave plasma chemical vapor deposition.
【24h】

Nanocrystalline diamond thin films on titanium-6 aluminum-4 vanadium alloy temporomandibular joint prosthesis simulants by microwave plasma chemical vapor deposition.

机译：微波等离子体化学气相沉积法在钛6铝4钒合金颞下颌关节假体上制备纳米晶金刚石薄膜。

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A course of research has been performed to assess the suitability of nanocrystal-line diamond (NCD) films on Ti-6Al-4V alloy as wear-resistant coatings in biomedical implant use. A series of temporomandibular (TMJ) joint condyle simulants were polished and acid-passivated as per ASTM F86 standard for surface preparation of implants. A 3-μm-thick coating of NCD film was deposited by microwave plasma chemical vapor deposition (MPCVD) over the hemispherical articulation surfaces of the simulants. Plasma chemistry conditions were measured and monitored by optical emission spectroscopy (OES), using hydrogen as a relative standard.; The films consist of diamond grains around 20 nm in diameter embedded in an amorphous carbon matrix, free of any detectable film stress gradient. Hardness averages 65 GPa and modulus measures 600 GPa at a depth of 250 nm into the film surface. A diffuse film/substrate boundary produces a minimal film adhesion toughness (ΓC) of 158 J/m2. The mean RMS roughness is 14.6 ± 4.2 nm, with an average peak roughness of 82.6 ± 65.9 nm. Examination of the surface morphology reveals a porous, dendritic surface.; Wear testing resulted in two failed condylar coatings out of three tests. No macroscopic delamination was found on any sample, but micron-scale film pieces broke away, exposing the substrate.; Electrochemical corrosion testing shows a seven-fold reduction in corrosion rate with the application of an NCD coating as opposed to polished, passivated Ti-6Al-4V, producing a corrosion rate comparable to wrought Co-Cr-Mo. In vivo biocompatibility testing indicates that implanted NCD films did not elicit an immune response in the rabbit model, and osteointegration was apparent for both compact and trabecular bone on both NCD film and bare Ti-6Al-4V.; Overall, NCD thin film material is reasonably smooth, biocompatible, and very well adhered. Wear testing indicates that this material is unacceptable for use in demanding TMJ applications without improvements to wear resistance behavior. Identified problems include high surface roughness due to an inadequate seeding procedure and a porous film surface. It is believed that these problems can be solved by future research, in which case NCD thin films should prove to-be well-suited as wear resistant coatings in biomedical applications.
机译：已经进行了研究过程，以评估Ti-6Al-4V合金上的纳米晶金刚石（NCD）膜作为生物医学植入物使用中的耐磨涂层的适用性。按照用于植入物表面制备的ASTM F86标准，对一系列颞下颌关节（TMJ）con突模拟物进行了抛光和酸钝化。通过微波等离子化学气相沉积（MPCVD）在模拟物的半球形关节表面上沉积3μm厚的NCD膜涂层。使用氢作为相对标准，通过光发射光谱法（OES）测量和监测血浆化学条件。薄膜由直径约20 nm的金刚石晶粒嵌入无定形碳基质中组成，没有任何可检测到的薄膜应力梯度。在进入膜表面250 nm的深度处，平均硬度为65 GPa，模量为600 GPa。漫射膜/基材边界产生的最小膜粘附韧性（Γ C ）为158 J / m 2 。平均RMS粗糙度为14.6±4.2 nm，平均峰粗糙度为82.6±65.9 nm。表面形态的检查显示出多孔的树突状表面。磨损测试导致三项测试中的两项con突涂层失效。在任何样品上都没有发现宏观的分层，但是微米级的薄膜碎片破裂了，暴露了基材。电化学腐蚀测试表明，与抛光钝化的Ti-6Al-4V相比，使用NCD涂层可降低腐蚀速率七倍，产生的腐蚀速率可与锻造的Co-Cr-Mo媲美。 体内生物相容性测试表明，植入的NCD膜未在兔模型中引发免疫反应，并且在NCD膜和裸露的Ti-6Al-4V上，紧密和小梁骨的骨整合都很明显。总体而言，NCD薄膜材料具有相当的光滑度，生物相容性和良好的粘附性。磨损测试表明，这种材料不能用于要求苛刻的TMJ应用中，而不能改善耐磨性能。已发现的问题包括由于不适当的接种程序和多孔膜表面而导致的高表面粗糙度。相信这些问题可以通过未来的研究来解决，在这种情况下，NCD薄膜应被证明非常适合作为生物医学应用中的耐磨涂层。

著录项

  • 作者

    Fries, Marc Douglas.;

  • 作者单位

    The University of Alabama at Birmingham.;

  • 授予单位 The University of Alabama at Birmingham.;
  • 学科 Engineering Materials Science.; Engineering Biomedical.
  • 学位 Ph.D.
  • 年度 2002
  • 页码 139 p.
  • 总页数 139
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;生物医学工程;
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号