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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Cobalt-chrome ： ウィキペディア英語版 Cobalt-chrome Cobalt-chrome or cobalt-chromium (CoCr) is a metal alloy of cobalt and chromium. Cobalt-chrome has a very high specific strength and is commonly used in gas turbines, dental implants, and orthopedic implants.〔(ARCAM ASTM F75 CoCr Alloy )〕 == History == Co-Cr alloy was first discovered by Elwood Haynes in the early 1900s by fusing cobalt and chromium. The alloy was first discovered with many other elements such as tungsten and molybdenum in it. Haynes reported his alloy was capable of resisting oxidation and corrosive fumes and exhibited no visible sign of tarnish even when subjecting the alloy to boiling nitric acid.〔Haynes, E. Metal alloy. US patent no. 873745; 1907.〕 Under the name Stellite™, Co-Cr alloy has been used in various fields where high wear-resistance was needed including aerospace industry,〔Ratner, B. D.; Hoffman, A. S.; Schoen, F. J.; Lemons, J. E. ''Biomaterial Science, ''2nd ed.; Academic Press, 1996.〕 cutlery, bearings, blades, etc. Co-Cr alloy started receiving more attention as its biomedical application was found. In the 20th century, the alloy was first used in medical tool manufacturing,〔Hyslop, D. J. S.; Abdelkader, A. M.; Cox, A.; Fray, D. J. Electrochemical Synthesis of a Biomedically Important Co-Cr Alloy. ''Acta Materialia''. 2010, ''58, ''3124-3130.〕 and in 1960, the first Co-Cr prosthetic heart valve was implanted, which happen to last over 30 years showing its high wear-resistance.〔Tarzia, V.; Bottio, T.; Testolin, L.; Gerosa, G. Extended (31 years) durability of a Starr-Edwards Prothesis in Mitral Positioin. ''Interactive CardioVasc Thorac Surg. ''2007, ''6, ''570-571. 〕 Recently, due to excellent resistant properties, biocompatibility, high melting points, and incredible strength at high temperatures, Co-Cr alloy is used for the manufacture of many artificial joints including hips and knees, dental partial bridge work, gas turbines, and many others.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Cobalt-chrome」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.