Beijing institute of Medical Device Test

Beijing, China

Beijing institute of Medical Device Test

Beijing, China
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Chang M.,Beijing Institute of Medical Device Test | Su J.,Beijing Institute of Medical Device Test
Manufacturing and Engineering Technology - Proceedings of the 2014 International Conference on Manufacturing and Engineering Technology, ICMET 2014 | Year: 2015

The article describes the process of metallographic specimen of pure titanium that improves successful rate of preparation of metal phase of pure titanium. The metallographic specimen can be mounted in cold resin so that the hydride content and morphology are not altered. Deformation twinning may be introduced in alpha alloys by aggressive sectioning and grinding procedures. © 2015 Taylor and Francis Group, London.


Chang M.,Beijing institute of Medical Device Test | Su J.,Beijing institute of Medical Device Test
Jinshu Rechuli/Heat Treatment of Metals | Year: 2014

The metallographic specimen was machined by the special silicon carbide cut-off wheels and the polishing solution was a mixture of colloidal silica and hydrogen peroxide. The specimen was polished on the Struers' automatic grinding miller with the special MD-Chem polishing cloth. Compared with the preparation of metallographic specimen of pure titanium made by others, the passage described the process of metallographic specimen of pure titanium that can obviously shorten the time and improve the successful rate of the preparation. The metallographic specimen can be mounted in cold resin in order not to alter the hydride content and morphology. Aggressive sectioning and grinding procedures could be lead α-alloy to deformation twinning.


Chang M.,Beijing Institute of Medical Device Test | Su J.,Beijing Institute of Medical Device Test | Hu G.,Beijing Institute of Medical Device Test | Zhai B.,Beijing Institute of Medical Device Test | And 5 more authors.
International Journal of Electrochemical Science | Year: 2016

In this work, corrosion resistance of the passive films formed on a biomedical grade NiTi shape memory alloy (SMA) surface in phosphate buffered saline (PBS) was improved using a simple linear cyclic potentiodynamic polarization technique. The results shown that the modification of NiTi SMA surface by cyclic potentiodynamic polarization between -0.9 V and a given anodic potential for a specified cyclic scan number resulted in a formed passive film which obviously enhanced corrosion resistance (both pitting and general) when compared to the naturally formation of a passive film. The influence of anodic potential limit and scan numbers on the pitting corrosion resistance was discussed. The capacitance analysis demonstrated that cyclic potentiodynamic polarization for the NiTi SMA surface under the given conditions caused an evident improvement of the surface's general corrosion resistance.

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