Dissertation > Excellent graduate degree dissertation topics show

Dielectric Breakdown of Epoxy Resin under Saline-fog Environments

Author: LiuYong
Tutor: DuBoXue
School: Tianjin University
Course: Proceedings of the
Keywords: Saline-fog environment Epoxy resin Dilelectric breakdown Breakdown process Breakdown mechanism
CLC: TM215.1
Type: Master's thesis
Year: 2006
Downloads: 178
Quote: 1
Read: Download Dissertation


A limited factor of electrical and electronic systems in saline-fog environment is the dielectric breakdown phenomenon of solid insulating materials, because it typically takes place at applied electric field much lower than the bulk breakdown strength. In this paper, based on the measurement of dielectric breakdown and theoretical analysis, epoxy resin has been employed to investigate the effects of material characteristics and fog parameters on the insulating properties.By utilizing the monocular-video-zoom microscopes, the sample surface was analyzed. Based on the surface energy theory, it can be found that the contact angle decreased with increasing the saline-fog conductance. It is considered that the chemical distortion on the surface under the saline-fog environment is responsible for dielectric breakdown under a low electric field. The printed electrodes have been developed to carry out the experiment, which is absolutely different from the conventional electrode contact. For the conventional electrode contact that the metal electrodes pressed on the insulating material directly, there is an energy gap between the electrode and insulating materials resulting from their poor contact. For the printed electrodes, the interface potential barrier is reduced due to the ideal contact.The breakdown phenomenon of sample surface was observed under dc voltages. Based on the band theory of solids, the developing process was proposed to explain the phenomenon. It is considered that the ideal electrode contact increases the dielectric breakdown voltage and decreases the decentralization. The leakage current during the breakdown process was investigated and considered to be dependent upon two related processes: discharge initiation and carbon/tracking formation. Then the further analysis was carried out to study the effects of saline-fog conductance, discharge energy and molecular construct of materials on the dielectric breakdown. Meanwhile, the dry band formation caused by the leakage current and the corresponding surface scintillation discharge were deduced theoretically to find their influences on the two opposing process: carbon formation and carbon removal.

Related Dissertations

  1. Study on Organic Silicone Modified Epoxy Resins Performance and Preparation of Adhesive,TQ323.5
  2. Synthesis and Application of new hyperbranched polymers,TQ323.5
  3. Research of Epoxy Resin Concrete (Mortar) Modified and Application,TU528.41
  4. Research on Curing Process of Epoxy Resin and Testing System of Dielectric Loss Factor,TQ323.5
  5. Study on the Preparation and Properties of Ultra-fine ZrW2O8/AlN/epoxy Composites,TQ323.5
  6. Study on the Synthesis and Property of a Silicon-containing Flame Retardant Epoxy Resin,TQ323.5
  7. Fiber Recognition of Cotton/Rayon Blended Yarn Based on Image Analysis,TP391.41
  8. Investigation of Arc-sprayed Aluminium Coating on 6061 Al Alloy and Its Sealing Treatments,TG174.4
  9. Tribological Behaviors of Epoxy Resin and Polyamide 66 Matrix Composites,TB332
  10. Investigation and Fabrication of Organic Field-Effect Transistors Based in Anthracene,TN386.1
  11. Preparation of Novel Transparent Inorganic/ Organic Polymer Nanocomposite Materials,TB383.1
  12. Studies on Complex Cathodic Electrodeposition Coating and Its Self-stratification Character,TQ630.7
  13. Preparation and Properties of Bisphenol A Type Novolac Epoxy Resins,TQ323.5
  14. Isolation and Enrichment of Rare Cells by Epoxy Resin Microfluidic Chips,R318.0
  15. Study on Preparation and Properties of Polyurethane Modified Epoxy Resin,TQ323.5
  16. Study on Adhesive with Fast-speed Curing at Room Temperature and High Adhesive Force,TQ430.1
  17. Epoxy Resin/Poly(Phthalazinone Ether) Blends and Composites,TB332
  18. Conductive composites of epoxy / graphite micro -chip,TB332
  19. Effects of Electropolymer of Carbon Fiber Tapes on Interface Properties of Resin Composites,TB332
  20. Synthesis and Characterization of Green Adhesives for Plywood and Nitrogen-phosphor-containing Phenolic Resins,TQ433
  21. Study on Epoxy Resin Structural Adhesive Modified by Nanophase Materials,TU58

CLC: > Industrial Technology > Electrotechnical > Electrical materials > Insulating materials,dielectric,and its products > Solid dielectric > Resins and plastics, polymeric insulating materials
© 2012 www.DissertationTopic.Net  Mobile