...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of biomedical materials research. Part B, Applied biomaterials. >Adherent octacalciumphoshate coating on titanium alloy using modulated electrochemical deposition method
【24h】

Adherent octacalciumphoshate coating on titanium alloy using modulated electrochemical deposition method

机译：调制电化学沉积法在钛合金上粘附八磷酸钙的涂层

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

Our aims in this study were (1) to develop an electrochemical method of depositing adherent octacalciumphosphate (OCP) and other calcium phosphate coatings on titanium alloy (Ti6Al4V) substrates of different shapes and surface preparations, (2) to determine the properties of the coating (composition, morphology, thickness, dissolution), and (3) to observe transformation of OCP to carbon-atehydroxyapatite (CHA) in simulated body fluid (SBF). Titanium (Ti)-alloy plates, tensile bars with four types of surfaces (grit-blasted with apatitic abrasive, chemically textured, arc-deposited, and Co-Cr-beaded) and dissolution cylinders were electrochemically coated with the use of modulated pulse time electric fields programmed with a custom-made dual microprocessor. Modulated electrochemical deposition (MECD) was carried out with pH and temperature conditions favorable for OCP formation. Coatings were characterized using X-ray diffraction, FT-IR, scanning electron microscopy, tensile strength tests, and solubility tests. XRD and FT-IR analyses showed that pure, uniform OCP coatings were produced on Ti6Al4V surfaces with coating-to-substrate tensile strengths greater than 7000 psi. Coatings on Ti arc-deposited surfaces, chemically textured surfaces, and Co-Cr-beaded surfaces all gave tensile strengths ranging from 5000 to 7000 psi, with no coating shadows in the crevices. Dissolution OCP coating in 100 mL of 0.1 M Tris buffer solution was determined from the amount of calcium (Ca) released onto the buffer, which was 7.7 +- 1.0 ppm Ca at pH 7.3 after 4 h, and 22 -+ 1.4 ppm Ca at pH 3 after 2 h. We found that OCP crystal size can be controlled by the current density and relative pulse time modulation. Our study demonstrated the following: (1) Highly adherent calcium phosphate (e.g., OCP) coating of uniform compositions (e.g., OCP) on Ti-alloy substrates can be obtained at low temperatures with the use of MECD by optimizing pulse time modulation of the electric field, reaction pH, temperature, and electrolyte composition; and (2) OCP readily transforms to CHA when exposed to SBF.
机译：我们在这项研究中的目的是（1）开发一种电化学方法，在不同形状和表面处理的钛合金（Ti6Al4V）基材上沉积附着的磷酸八钙（OCP）和其他磷酸钙涂层，（2）确定涂层的性能（组成，形态，厚度，溶解度），以及（3）观察模拟体液（SBF）中OCP向碳-羟基羟基磷灰石（CHA）的转化。使用调制的脉冲时间对钛（Ti）合金板，具有四种类型的表面的拉力棒（用羊毛磨料进行喷砂处理，化学织构化，电弧沉积和Co-Cr珠化）和溶解圆柱体进行电化学涂覆，使用调制的脉冲时间用定制的双微处理器编程的电场。在有利于OCP形成的pH和温度条件下进行调制电化学沉积（MECD）。使用X射线衍射，FT-IR，扫描电子显微镜，拉伸强度测试和溶解度测试对涂层进行表征。 XRD和FT-IR分析表明，在Ti6Al4V表面上产生了纯净，均匀的OCP涂层，涂层对基材的拉伸强度大于7000 psi。 Ti电弧沉积表面，化学织构化表面和Co-Cr珠化表面上的涂层均具有5000到7000 psi的拉伸强度，并且在缝隙中没有涂层阴影。由释放到缓冲液中的钙（Ca）量确定在100 mL的0.1 M Tris缓冲液中的OCP涂层溶解度，该钙在4小时后的pH值为7.3 +-1.0 ppm Ca，在4 h后为22-+ 1.4 ppm Ca 2小时后pH为3。我们发现，OCP晶体的大小可以通过电流密度和相对脉冲时间调制来控制。我们的研究证明了以下几点：（1）在低温下，使用MECD可通过优化碳纤维的脉冲时间调制，在Ti合金基底上获得均匀成分（例如OCP）的高附着力磷酸钙（例如OCP）涂层。电场，反应pH，温度和电解质成分; （2）OCP暴露于SBF时很容易转换为CHA。

著录项

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