Process Parameters Optimization of Anodic Aluminum Oxide

• Main Authors: Yu-wei Tsai, 蔡育瑋
• Other Authors: Tzung-ta kao
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/09360102360948758619

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. Key word: