Surface Engineering and Technology for Biomedical Implants by Yoshiki Oshida

By Yoshiki Oshida

This new ebook synthesizes quite a lot of interdisciplinary literatureto give you the state-of-the paintings of biomedical implants. It discussesmaterials and explains the 3 easy specifications for implant successfrom a floor engineering standpoint: organic compatibility, biomechanical compatibility, morphological compatibility. Biomedical, mechanical, and fabrics engineers will locate this bookindispensable for Read more...

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The structural and chemical properties of anodic oxides on titanium can be varied significantly by controlling the process variables, such as anode potential, electrolyte composition, temperature, and current. Different diluted acids (H2SO4, H3PO4, acetic acid, and others) are commonly used electrolytes for anodic oxidation of titanium (Lausmaa, 2001). Electropolishing is a widely used industrial method for surface finishing of metal components. The process essentially acts as a controlled electrochemical dissolution of the amorphous native oxide to give a polycrystalline metallic surface.

The superior fatigue and ultimate tensile strength of the wrought CoeNieCreMo alloy make it suitable for the applications that require long service life without fracture or stress fatigue, such as the stems of the hip joint prostheses (Park and Kim, 2000). The molybdenum is added to produce finer grains, which results in higher strengths after casting or forging. The chromium addition enhances corrosion resistance and solid solution strengthening of the alloy. , 2012) or wear processes. In general, Cr (III) ions are not toxic; nevertheless, a high concentration of Cr (VI) ions in the human body bears a carcinogenic risk (Silva-Bermudez and Rodil, 2013).

For titanium, depending on the exact process parameters, the rate of material removal (dimensional change) will be in the range of 1e10 mm per minute (Lausmaa, 2001). For the electro-erosion process, the vicinity of a CueZn wire from the surface initiates a plasma zone, which locally melts the surface of the titanium implants and grows a TiO2 layer. Bigerelle et al. (2002) reported that the main influential characteristics of the electro-eroded surfaces may be their isotropic and smooth aspects of the relief as a result of surface fusion during the process.

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