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研究生： 張峰筌
Feng-Chuan Chang
論文名稱： 液態電漿氧化處理對Ti-6Al-4V鈦合金之微結構與機械性質影響研究
Microstructural and mechanical properties evaluation of oxide layer grown by plasma electrolytic oxidation
指導教授： 王朝正
Chaur-Jeng Wang
口試委員: 李志偉
Jyh-Wei Lee
郭俞麟
Yu-Lin Kuo
學位類別： 碩士
Master
系所名稱： 工程學院 - 機械工程系
Department of Mechanical Engineering
論文出版年： 2016
畢業學年度： 104
語文別： 中文
論文頁數： 137
中文關鍵詞： 液態電漿氧化 、Ti-6Al-4V 、二硫化鉬 、氮化矽 、鈦酸鋁 、刮痕測試 、磨耗測試
外文關鍵詞： plasma electrolytic oxidation, Ti-6Al-4V, MoS2, Si3N4, tialite, scratch test, pin-on-ball wear test
相關次數： 點閱：309  下載：0 
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  •  上一筆

    • 本實驗使用脈衝直流電源在Ti-6Al-4V表面進行液態電漿氧化實驗，並使用兩種電解液。在磷酸系列的製程探討控制佔空比(duty cycle)與電解液中添加MoS2奈米顆粒的方式，來製備不同參數的液態電漿氧化層，以定電流2.5 A，且最高電壓400 V的參數進行操作，觀察佔空比與奈米顆粒對於氧化層性質影響。在偏鋁酸系列的製程則是固定50%佔空比以定電流1.2 A，且最高電壓450 V，改變Si3N4奈米顆粒的添加量，其中部分參數使用十二烷基硫酸鈉(sodium lauryl sulfate, SDS)作為奈米顆粒表面分散劑，觀察Si3N4奈米顆粒與十二烷基硫酸鈉(sodium lauryl sulfate, SDS)對於氧化層性質的影響。利用X光繞射儀確認氧化層的晶體結構，並使用掃描式電子顯微鏡/能量散佈光譜儀分析氧化膜的成份，觀察氧化層的表面與截面之顯微結構。藉由奈米硬度機測量氧化層的硬度以及表面輪廓儀測量表面粗糙度。各液態電漿氧化技術製備氧化層再進行附著性試驗、耐磨耗試驗與腐蝕實驗分析。

    In this work, a pulsed DC power supply is employed to fabricate the PEO oxide layer on the Ti-6Al-4V alloy. Our experimental procedure is divided into the two PEO processes. The first PEO process is kept for 20 min at a constant current of 2.5 A. A maximum voltage of 400 V is set for PEO process. The MoS2 particles with concentrations of 4 g/L are added into the electrolyte. Three duty cycles, 20%, 35%, and 50%, are selected and the frequency is fixed at 1000 Hz during PEO process. In addition, the second PEO process is kept for 10 min at a constant current of 1.2 A. A maximum voltage of 450 V is set for PEO process. The duty cycle of 50% is selected and the frequency was fixed at 1000 Hz. Besides, the ethanol is adopted to play a role of the dispersant agent and the Si3N4 particles with different concentrations from 1 to 6 g/L are added into the electrolyte. The SDS additive is added at a fraction of samples to modify the Si3N4 particles. The structures of PEO coating is determined by the X-ray diffractometer (XRD). The surface and the cross-section of the PEO coatings are examined by scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS). The HRC-DB test and scratch test are used to evaluate the adhesion quality of the coating. The surface roughness is examined by a profilometer. Furthermore, the coefficient of friction of the coatings is measured using a pin-on-disk wear tester to investigate the wear resistance of coatings against the 5 mm diameter high Cr steel ball. The corrosion resistance of the PEO coatings are evaluated by the potentiodynamic polarization test in 5 wt.% NaCl solution.

    目錄 摘要 …………………………………………………………………………………...I ABSRACT ………………………………………………………….………………...II 致謝………………………………………………………………….…………..…...IV 目錄…………………………………………………………….……………………..V 圖目錄…………………………………………………………………………...…VIII 表目錄……………………………………………………………………...………XIV 第一章 緒論 …………………………………………………………………………1 1.1 前言 …………………………………………………………………………….1 1.2 研究動機及目的 ……………………………………………………………….2 第二章 文獻回顧……………………………………………………………………..3 2.1 液態電漿氧化技術…………………………………….….…………………….3 2.1.1 發展背景介紹………………………………………...…...…………………3 2.1.2 液態電漿氧化原理…………………………………………………………..4 2.2 放電種類……………………………………………………………..………….9 2.3 液態電漿隨時間變化過程…………………………………………………….12 2.3.1 電漿隨時間之變化……………………………………………...………….12 2.3.2 液態電漿氧化放電隨時間之變化…………………………..……………..14 2.4 液態電漿氧化層的結構……………………………………………………….16 2.5 液態電漿氧化電解液之選擇與影響………………………….………………17 2.6 液態電漿氧化電解液添加粉末之影響……………………………………….20 2.7 以陰離子界面活性劑使粉末改質方法……………………...………………..21 2.8 液態電漿氧化技術之文獻參數比較………………...………….…………….23 2.9 電化學腐蝕極化分析………………………………………………………….25 2.9.1 電化學檢測…………………………………………………………………25 2.9.2 極化阻抗……………………………………………………………………26 2.9.3 Tafel曲線外插法……………………………………………………………27 第三章 實驗方法與步驟……………………………………………………………31 3.1 實驗流程………………………………………………..……………………...31 3.2 實驗方法與步驟……………………………………….………………………34 3.2.1 試片製備…………………………………………...……………………….34 3.2.2 液態電漿氧化製程實驗……………………………………………………34 3.3 實驗參數…………………………………………….…………………………35 3.4 膜層性質分析……………………………………….…………………………37 3.4.1 晶體結構分析………………………………………..……………………..37 3.4.2 化學成分分析………………………………………………………………38 3.4.3 表面與截面形貌之分析……………………………………………………39 3.4.4 硬度試驗…………………………………………..………………………..41 3.4.5 附著性分析………………………………………..………………………..43 3.4.5.1 HRC-DB test 壓痕試驗法…………………...………………………….43 3.4.5.2 Micro Vickers hardness test 壓痕試驗法…..…………………………...44 3.4.5.3 刮痕試驗…………………………………...……………………………46 3.4.6 磨耗試驗……………………………………………………………………47 3.4.7 電化學腐蝕試驗……………………………………………………………48 第四章 結果與討論…………………………………………………………………50 4.1 以磷酸鉀製備液態電漿氧化層……………………………………………….50 4.1.1 電壓與電流時間關係………………………………………………………50 4.1.2 晶體結構分析與化學成分組成分析……………..………………………..52 4.1.3 微觀結構分析………………………………………………………………54 4.1.4 奈米硬度分析……………………………………...……………………….60 4.1.5 附著性分析…………………………………………………………………61 4.1.6 磨耗分析……………………………………………………………………65 4.1.7 抗腐蝕能力分析…………………………..………………………………..70 4.2 以偏鋁酸鈉製備液態電漿氧化層……………….…........................................72 4.2.1 晶體結構分析與化學組成分析……………………………………………72 4.2.2 微觀結構分析……………………………...……………………………….77 4.2.3 奈米硬度分析………….……………………...……………………………92 4.2.4 附著性分析…….…………………………...…...………………………….87 4.2.5 磨耗分析………………………………………………...……….………...101 4.2.6 抗腐蝕能力分析…………………………………………...…….………...106 第五章 結論……………………………………………………………….………..108 參考文獻…………………………………………………………………….………110

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