| Summary: | 碩士 === 國立高雄第一科技大學 === 電機工程研究所碩士班 === 102 === The purpose of the study is to optimize the anodic aluminum oxide conversion
efficiency. The experiment of the study is divided into two parts using Taguchi
Method。The control factorsfor the first part of experiment are annealing temperature
(A), the annealing time (B), the dimensions of the magnet (C) and the magnet speed (D).
The control factors for the second part of experiment are annealing time A, annealing
temperature (B), size of the magnet(C) , magnet rotation speed (D), the voltage (E), the
concentration of phosphoric acid (F), the concentration of oxalic acid (H) and the
temperature (G). By the design of orthogonal array L9 (34) and L18 (21 * 37) , two
groups of conversion efficiency of nine and eighteen, respectively, are obtained. The
best parameter factors are achieved by the S/N ratiosof the greatest quality
characteristics,.
We use high-purity aluminum (99.98%) as the substrate. The aluminum substrate is
annealed before aluminum anodization experiment, The annealing time, annealing
temperature and the aluminum anodization conditions are chosen according to the
orthogonal array and then the conversion efficiency result from 1.1 to 1.96 by the
division of the formed AAO weighing divided by the weight of consumed aluminum
multiplied a mole weight factor. The experimental range of control factors : the
annealing temperature was 400 ° C ~ 600 ° C, time was 30min ~ 60min, magnet size
was 1.5cm ~ 2.5cm, magnet speed was 80rpm ~ 120rpm. The other control factors as
voltage, the concentration of phosphoric acid, oxalic acid concentration and temperature
III
parameters adopted the same value as previous optimal results. The effects of control
factors are analyzed using the signal-to-noise (S/N) ratio and the analysis of variance
(ANOVA). According to the results, annealing temperature play the significant role
on the conversion efficiency of anodic aluminum oxide. Furthermore, the estimated
optimum values of the process parameters are corresponding to anodizing voltage of
160 V, phosphoric acid of 1.1 M, oxalic acid of 0.14 M, and electrolyte temperature of 2
°C.
Finally, the optimized parameters factors laser heat treatment, γ-Al2O3 phase
transformation of α-Al2O3 phase, analyzed and discussed.
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