Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/9448
標題: 電解沉積氧化鋁陶瓷膜於MAR-M247超合金之研究
Electrolytic Deposition of Al2O3 on MAR-M247 Superalloy
作者: 張正君
Chang, Cheng-Chun
關鍵字: Electrolytic Deposition;電解沉積;Alumina Coating;Superalloy;氧化鋁;超合金
出版社: 材料工程學研究所
摘要: 
本研究以MAR-M247超合金為基材,利用電解沉積由硝酸鋁(Al(NO3)3)
水溶液中製備氧化鋁陶瓷膜,經燒結過的試片再以恆定電位儀、SEM/EDS、
XRD、TGA及刮痕試驗機等儀器來分析氧化鋁薄膜之性質。 經由H2O、
NaNO3、HCl及Al(NO3)3溶液個別之陰極極化實驗,推測MAR-M247超合金試
片在Al(NO3)3溶液中之陰極極化曲線可分為四階段:第一階段為氫還原:H+
+ e ->H2; 第二階段為Al 3+與水形成錯離子Al(H2O)3 3+ 得到電子形成
氫氧化鋁及氫氣:Al(H2O)3 3+ + 3e -> Al(OH)3 + 3/2 H2;第三階段為
Al(H2O)3 3+擴散極限;第四階段為H2O還原,2H2O + 2e -> H2 + 2OH-。
在C2農渡及d2沉積時間下為較理想的沉積條件,可得均勻且乾燥時不易破
裂之薄膜。經由XRD分析,發現由此法所製備的氧化鋁其相轉換為
amorphous -> r-Al2O3 -> d-Al2O3-> 0-Al2O3。經由循環極化及TGA測試
發現,被覆氧化鋁陶瓷膜可提高基材的抗蝕性及抗氧化性。由括痕試驗顯
示,鍍膜在MAR-M247超合金之附著力大於基材的降伏強度。

MAR-M247 superalloy was electrochemically coated with Al2O3
in Al(NO3)3 aqueous solution. The characterization of the
alumina coatingson MAR-M247 superalloy was conducted by using
potentiostat spectroscopy,SEM/EDS, XRD, TGA and scratch test
techniques. Through the analysis of cathodic polarization
experiments in H2O, NaNO3,HCl and the mixture of HCl and NaNO3
solutions respectively, it was suggest that the cathodic
polarization curves of MAR-M247 superalloy in Al(NO3)3 could be
comminuted into four steps:1. The reduction of H2: H+ + e ->
H2, 2. Thereduction of Al(H2O3)3 3+: Al(H2O3)3 3+ + 3e -> Al(
OH)3 + 3/2 H2, 3. The diffusion limlt of Al(H2O)3 3+ complex
ion, 4. The reduction of H2O: 2H2O +2e -> H2 + 2OH-. Auniform
thin film of deposition without crack was found in C2
concentrationand for d2 deposition duration. The X-ray diff
ction (XRD) diagrams showed that the Al(OH)3 gel was transformed
into amorphous ->r-Al2O3 ->d-Al2O3 -> 0-Al2O3.The cycle
polarization test and TGA indicate that alumina coating on MAR-
M247 superalloy are more resistance in corrosion and oxidation,
respectively. Thescratch test indicated that adhesion of alumina
coating on MAR-M247 superalloy can resists the load stress
larger than the yield stress of the alloy.
URI: http://hdl.handle.net/11455/9448
Appears in Collections:材料科學與工程學系

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