EVALUATION OF NEWLY DEVELOPED CORROSION RESISTANT/HIGH STRENGTH MG ALLOYS FOR ORTHOPEDIC APPLICATION

Title
EVALUATION OF NEWLY DEVELOPED CORROSION RESISTANT/HIGH STRENGTH MG ALLOYS FOR ORTHOPEDIC APPLICATION
Authors
석현광김유찬양귀복차필령조성윤양석조
Issue Date
2011-09
Publisher
3rd Asia Biomaterials Congress
Abstract
Key technology for retarding the corrosion of the Mg alloys, which is strongly required as the most Mg alloys are dissolved in alive body too quickly, is to equalize the corrosion potentials of the constituent phases in the alloys, which prevented the formation of Galvanic circuit between the constituent phases resulting in remarkable reduction of corrosion rate. By thermodynamic consideration, the possible phases of a given alloy system were identified and their work functions, which are related to their corrosion potentials, were calculated by the first principle calculation. The designed alloys, of which the constituent phases have similar work function, were fabricated by clean melting and extrusion system. The newly developed Mg alloys named as KISTUI-Mg showed much lower corrosion rate as well as higher strength than previously developed Mg alloys. In additions, newly developed Mg alloys showed excellent biocompatibility satisfying the regulations required for biomedical application without evident hydrogen evolution when it implanted into the muscle, inter spine disk, as well as condyle bone of rat and well contact interface with bone tissue when it was implanted into rat condyle. Moreover, the cells attached on the Mg alloys was observed using cryo- FIB (focused ion beam) system without the distortion of cell morphology and its organ through the removal of drying steps essential for the preparation of normal SEM/TEM samples.
URI
http://pubs.kist.re.kr/handle/201004/40387
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KIST Publication > Conference Paper
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