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研究生:鐘超群
研究生(外文):Chau-Chyun Chung
論文名稱:氧化鋁/氧化鋯之水系電泳沉積製程研究
論文名稱(外文):Aqueous Electrophoretic Deposition of Alumina and Zirconia
指導教授:黃士龍黃士龍引用關係
指導教授(外文):Shyh-Lung Hwang
學位類別:碩士
校院名稱:國立東華大學
系所名稱:材料科學與工程學系
學門:工程學門
學類:材料工程學類
論文種類:學術論文
論文出版年:2002
畢業學年度:90
語文別:英文
論文頁數:111
外文關鍵詞:zirconiaaluminaelectrophoretic deposition (EPD)
相關次數:
  • 被引用被引用:2
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A systematic study has been conducted to understand the colloidal behaviors of alumina and zirconia in aqueous suspensions and their corresponding EPD processes. The suspension stability of Al2O3/H2O and ZrO2/H2O can be achieved via either electrostatic or electrosteric effects. A homogeneous deposit can be obtained, and the hydrolysis can be inhibited by polyelectrolyte addition during EPD process.
For constant-current EPD process, the deposition rate of charged particle decreases with increasing polyelectrolyte concentration, increases with increasing current density, and is independent of solid loading. A kinetic equation has been derived from Faraday’s law and compared reasonably with the deposition rate data. Microstructure of sintered deposit shows that the highest density can be achieved of ~98% T.D. for Al2O3 and ~99% T.D. for ZrO2 respectively.
TABLE OF CONTENTS

ABSTRACT………………………………………………………Ⅰ
TABLE OF CONTENTS……………………………………………Ⅱ
LIST OF TABLES……………………………………………………Ⅳ
LIST OF FIGURES…………………………………………………Ⅴ
CHAPTER

1. INTRODUCTION AND OBJECTIVE……………………1
1.1 A Brief Summary of Ceramic Processing…………………1
1.2 Purpose of the Study………………………………………2

2. BACKGROUND………………………………………………4
2.1 Introduction…………………………………………4
2.1.1 Principle of Electrophoretic Deposition
2.2 Application of EPD……………………………………………5
2.3 Suspension System for EPD…………………………………6

3. EXPERIMENTAL METHODS AND PROCEDURE………9
3.1 Raw Materials…………………………………………………9
3.2 Suspension Preparation…………………………………10
3.3 Suspension Stability Measurement……………………11
3.4 Adsorption Measurement of Polyelectrolyte…………11
3.5 Powder Characterization……………………………………13
3.6 Ni/YSZ Cermet Preparation…………………………………14
3.7 Electrophoretic Deposition Process………………15
3.8 Sintering and Microstructure Characterization………16

4. RESULTS AND DISCUSSION……………………………26
4.1 Colloidal Stability of Suspension………………………26
4.2.1 The Effect of pH Value
4.2.2 The Effect of Polyelectrolyte Addition
4.2 Electrophoretic Deposition Process……………………28
4.2.1 The Effect of pH Value
4.2.2 The Effect of Polyelectrolyte Addition
4.3 Kinetics of Electrophoretic Deposition………………31
4.3.1 Adsorption of Polyelectrolyte
4.3.2 Deposition Rate- Effect of Polyelectrolyte
Addition
4.3.3 Deposition Rate- Effect of Current Density
4.3.4 Deposition Rate- Effect of Solid Loading
4.3.5 Faraday’s Law
4.4 Characterization of Deposits………………………………43
4.4.1 Scanning Electron Microscopy Observation
4.5 Application of EPD to SOFC…………………………………46
4.5.1 Fabrication of Ni/YSZ Cermet
4.5.2 EPD of Zirconia Coating
4.5.3 Microstructure Characterization
5. CONCLUSIONS……………………………………………104
BIBLOGRAPHY…………………107
BIBLIOGRAPHY

CHAPTER 2
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19. Partho Sarkar, Xuening Haung, and Patrick S. Nicholson, “Structural Ceramic Microlaminates by Electrophoretic Deposition,” J. Am. Ceram. Soc., 84 [3] 2907-2909(1992).
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CHAPTER3
1. J. Cesarano III, I. A. Aksay, "Stability of Aqueous α-Al2O3 Suspensions with Poly(methacrylic acid) Polyelectrolyte, " J. Am. Ceram. Soc., 71 [4] 250-255 (1988).

CHAPTER4
1. I. Zhitomirsky, A. Petric, “Electrophoretic deposition of ceramic materials for fuel cell applications,” J. Eur. Ceram. Soc., 20 (2000) 2055-61.
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5. J. H. Jean and H. R. Wang, “Stabilization of Aqueous BaTiO3 suspensions with Ammonium Salt of Poly(acrylic acid) at various pH Values,” J. Mater. Res., 13, 2245-50 (1998).
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