文摘
英文文摘
论文说明：LIST OF FIGURES及TABLE、Nomenclature
声明
Chapter Ⅰ Introduction
1.1 Preface
1.2 Arrestor
1.3 Varistor
1.3.1 Semiconductor ceramics and varistor
1.3.2 Varistor bulk materials
1.4 Zinc oxide
1.4.1 Physical properties of ZnO
1.4.2 Microstructure of ZnO
1.4.3 Energy levels of ZnO
1.4.4 Defects of ZnO
1.4.5 Electric properties of ZnO varistor
Chapter 2 Literature Survey
2.1 Introduction
2.2 Optimization of chemical compositions for ZnO varistor
2.2.1 ZnO-Bi2O3 based system
2.2.2 ZnO-Pr6O11 based system
2.2.3 ZnO-rare earth based system
2.2.4 ZnO-glass system
2.3 Preparation technology
2.4 Conduction mechanism of doped ZnO varistor
2.5 Background and outline of the thesis
2.5.1 Background of the thesis
2.5.2 Outline of the thesis
Chapter 3 Experimental Description
3.1 Raw materials
3.2 Sample preparation
3.2.1 Experimental equipments
3.2.2 Powder preparation
3.2.3 Sample preparation
3.2.4 Sliver electrodes preparation
3.3 Performance measurement
3.3.1 Bulk density and water absorption
3.3.2 Structural analysis
3.3.3 Measurement of electric properties
Chapter 4 Effect of Sintering Process on the Electric Properties of ZnO Varistor
4.1 Introduction
4.2 Experiment
4.3 Results and discussion
4.3.1 Determination of the sintering schedule
4.3.2 The influence of sintering temperature on the electric properties of ZnO varistor
4.3.3 The influence of heating rate on the electric properties of ZnO varistor
4.4 Summary
Chapter 5 The Influence of Various Rare Earth Oxides on the Microstructural and Electrical Characteristics of ZnO- based Varistor
5.1 Introduction
5.2 Experimental
5.3 Results and discussion
5.3.1 Physical and electrical properties
5.3.2 Microstructure analysis
5.3.3 EDX analysis
5.3.4 XRD analysis
5.4 Summary
Chapter 6 ZnO-Y2O3-In2O3 Glass Based Varistor
6.1 Introduction
6.2 Experiment
6.3 Results and discussion
6.3.1 Particle size analysis
6.3.2 Electrical properties
6.3.3 Sintering behaviors
6.3.4 Microstructural analysis
6.3.5 XRD analysis
6.4 Summary
Conclusions
References
Acknowledgments
Appendix
