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Titanium sponge on titanium substrate for titanium electrolytic capacitor anodes.

机译：钛基板上的海绵钛，用于钛电解电容器阳极。

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摘要

Capacitors are energy storage devices capable of supplying electric energy. Volumetric and gravimetric energy storage efficiencies are some of the important criteria for evaluating electrolytic capacitors as energy storage devices. High energy density capacitors can be achieved by anodic growth of a dielectric film on surface enhanced valve-metal. Electrodes with high surface area accessible along with wide and short conduction paths (electrolyte) have advantages as power devices. Surface-enhanced metal substrates can be made by various methods. One method is by oxidation followed by reduction.; Oxidation of a metal and reduction of oxide are generally associated with volume changes. During growth of an oxide scale on a metal substrate, the volume expansion of an attached oxide scale can only occur in the thickness direction. During subsequent reduction of the oxide volume shrinkage occurs. It can take place along all directions, in particular in the plane of the oxide scale. This shrinkage leads to pores in the metal layer that is formed by the reduction of the oxide scale. Therefore, a layer of titanium sponge can be obtained by the oxidation plus reduction method. The titanium sponge layer can be anodized in order to grow a thin dielectric film on the surface of the sponge metal. In this way it is made into a capacitor anode.; Reduction of titanium oxide scale with magnesium or calcium produces titanium sponge with different morphologies. Magnesium-reduced sponge has a higher degree of porosity than calcium-reduced sponge. The different morphologies of the reduced oxide scale result from different reduction behaviors in the presence of magnesium or calcium. Possible mechanisms are suggested to explain how magnesium and calcium affect the reduction behavior of titanium oxide.; Because titanium anodic films tend to have high leakage current, titanium is not used for commercial electrolytic capacitor anodes. Nitrogen and oxygen doping of titanium surface layer enables the growth of a doped anodic titanium film and can decrease leakage current of titanium anodic film. Leakage current of titanium anodic film decreases with higher [N + O] doping level. TEM micrograph shows that such doped titanium anodic film has an improved micro-structure.
机译：电容器是能够提供电能的能量存储设备。体积和重量能量存储效率是评估电解电容器作为能量存储设备的一些重要标准。高能量密度电容器可通过在表面增强的阀金属上阳极生长介电膜来实现。具有高表面积的电极以及宽和短的导电路径（电解质）均可作为功率器件使用。表面增强的金属基板可以通过各种方法来制造。一种方法是氧化然后还原。金属的氧化和氧化物的还原通常与体积变化有关。在金属基板上的氧化皮的生长过程中，附着的氧化皮的体积膨胀只能在厚度方向上发生。在随后的氧化物减少中，发生体积收缩。它可以沿所有方向进行，特别是在氧化皮的平面内。该收缩导致金属层中的孔，该孔是通过减少氧化皮而形成的。因此，可以通过氧化加还原法获得海绵钛层。可以对钛海绵层进行阳极氧化，以便在海绵金属的表面上生长一层薄的介电膜。这样就制成了电容器阳极。用镁或钙还原二氧化钛水垢会产生不同形态的海绵钛。镁还原海绵比钙还原海绵具有更高的孔隙度。还原的氧化皮的不同形态是由于在镁或钙存在下的不同还原行为。建议了可能的机制来解释镁和钙如何影响氧化钛的还原行为。由于钛阳极膜往往具有高泄漏电流，因此钛不用于商业电解电容器阳极。钛表面层的氮和氧掺杂能够使掺杂的阳极钛膜生长，并且可以减小钛阳极膜的泄漏电流。 [N + O]掺杂水平越高，阳极钛膜的漏电流就越小。 TEM显微照片表明，这种掺杂的钛阳极膜具有改善的微观结构。

著录项

  • 作者

    Ki, Jun-Wan.;

  • 作者单位

    Case Western Reserve University.;

  • 授予单位 Case Western Reserve University.;
  • 学科 Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 2005
  • 页码 192 p.
  • 总页数 192
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;
  • 关键词

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