Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/10054
標題: 電解沉積氧化鋁於鈷鉻鉬合金上之研究
The Study of Electrolytic Al2O3 Coating on Co-Cr-Mo Alloy
作者: Hsu, Shou Wen
許碩文
關鍵字: 電解沉積;electrolytic;氧化鋁;人工關節;alumina;Co-Cr-Mo alloy;hip prosthesis
出版社: 材料工程學研究所
摘要: 
摘 要
本實驗是在硝酸鋁溶液中,利用電解沈積的方法,將氧化鋁薄膜沈積於F-75鈷基合金表面上。藉由控制不同的電化學參數(濃度、電位、時間),和不同的燒結條件後,決定適當的鍍膜條件,並利用恆定電位儀、OM、SEM/EDS、XRD、刮痕試驗機,探討這些鍍膜之特性。
由XRD的結果發現,電解沉積氧化鋁鍍膜於 CoCrMo 合金上之相變化過程如下:
由循環極化實驗結果顯示,氧化鋁鍍層經適當溫度燒結後,其極限電流密度較基材低,而腐蝕電位、保護電位均較基材高,可提高抗蝕性。
以燒結溫度T6-t3的氧化鋁鍍膜的刮痕試驗SEM圖,計算鍍膜在CoCrMo合金上之荷重應力可克服4456MPa,大於此材料之降伏強度(450 Mpa),此應力相當於一般人體運動中髖骨荷重之13倍,高於氧化鋯。
磨耗實驗中氧化鋁鍍膜及基材與超高分子量聚乙烯(UHMWPE)在荷重10N下進行往復磨耗1800次,其UHMWPE之磨耗量具氧化鋁鍍膜為基材之1/10。

Abstract
The Electrolytic deposition of alumina (Al2O3) coatings on F-75 CoCrMo alloy was conducted in an aqueous solution of alumina-nitrate[Al(NO3) 3]. The better condition of alumina coatings on CoCrMo alloy was determined by controlling different elertrical-chemical parameter ( concentration, potential, time ) and different sintering conditions; and its characterization was conducted by using Potentiostat, OM, SEM/EDS, XRD, wear test and scratch test .
In the XRD experiment, it can be concluded that the phase transformation of the alumina-film has two paths:
Through the cycle polarization test in Hanks'' solution, we can find the corrosion potential and protection potential of the alumina-film is higher than the substrate . The alumina-film after annealing below T5 reveals less corrosion current density than substrate. We conclude that the alumina film has a better quality in corrosion.
SEM/EDS observations after the scratch tests show that the alumina-films on CoCrMo alloy can load a stress over the yield strength (450MPa) of CoCrMo which is 13 times of the loading of hip joints during gait(35Mpa), and is higher than ZrO2 coated film.
The wear tests show that the alumina-films worn by UHMWPE with a load stress of 50.9 MPa, for 1800 wear cycles, were undestroyed on the alloy substrate. Besides, the wear loss of UHMWPE to the Al2O3 coated specimen is only 1/10 of that to the uncoated.
URI: http://hdl.handle.net/11455/10054
Appears in Collections:材料科學與工程學系

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