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Electrochemical Behavior of Co-Cr alloy in Neutral Solution
Ryouji Suzuki,Kazuhiko Noda,Yusuke Tsutsumi,Takao Hanawa 한국표면공학회 2010 한국표면공학회 학술발표회 초록집 Vol.2010 No.11
The Co-Cr alloys which have an excellent mechanical property and corrosion resistance are known as one of the most important metallic biomaterials. In this study, the electrochemical behavior of Co-Cr alloy in deaerated different electrolytes was investigated by using polarization curve measurements. Ti and stainless steels (Type 316) were used as a comparing material. The Co-Cr alloy has high corrosion resistance compared with the stainless steel in NaCl solution. The current increasing with the pitting corrosion was appeared in polarization curves of stainless steels. But it was disappeared in polarization curves of Co-Cr alloy. The passive state of the Co-Cr alloys was kept even in the pitting region of the case of stainless steels. The passive film on the Co-Cr alloy is stable as same as the film on Ti. According to the polarization behavior, the Co-Cr alloys are expected to use as the biomaterials.
Fabrication and Mechanical Properties of Porous Ti/HA Composites for Bone Fixation Devices
Nomura, Naoyuki,Sakamoto, Kozue,Takahashi, Katsuya,Kato, Seiji,Abe, Yasunori,Doi, Hisashi,Tsutsumi, Yusuke,Kobayashi, Masahiro,Kobayashi, Equo,Kim, Woo-Jong,Kim, Kyo-Han,Hanawa, Takao The Japan Institute of Metals 2010 MATERIALS TRANSACTIONS Vol.51 No.8
<P>Porous Ti (pTi)/hydroxylapatite (HA) composites were fabricated by an infiltration method in a vacuum and sintering. The Young’s modulus of the composites was evaluated before and after the immersion in Hanks’ solution. The strength of the composites was also evaluated by four-point bending test. The Young’s modulus of the compacts was governed by the porosity and was comparable to the human bone in the porosity range from 24 to 34%. The Young’s modulus of sintered pTi/HA composites was larger than that of pTi. The Young’s modulus of the sintered pTi/HA composites decreased after immersion in Hanks’ solution. The proof and bending strengths of the sintered pTi/HA composites were larger than those of pTi. Solid solution hardening of Ti by oxygen contributed the increase of the proof strength.</P>