Dissertation > Excellent graduate degree dissertation topics show

Microstructure Controlling and Properties of ZrO2Coating by Chemical Vapor Deposition

Author: HaoZhenHua
Tutor: XiongXiang
School: Central South University
Course: Materials Science
Keywords: chemical vapor deposition zirconia coating carbon/carbon composites
CLC: TB304
Type: Master's thesis
Year: 2012
Downloads: 150
Quote: 0
Read: Download Dissertation

Abstract


C/C composite has many excellent properties and it is a kind of ideal material for aircraft and spacecrafts, but it cannot meet the requirements of some key components of aircrafts because of the rapid development in aircrafts with heavier load, larger force, higher combusting temperature and further distance.Zirconia coatings were prepared by atmospheric pressure chemical vapor deposition(APCVD) from ZrCl4-CO2-H2-Ar system on different conditions in this paper; the thermodynamics of the system were calculated and the Dynamics of the system were analysed; the effects of preparation parameters(such as deposition temperature, Hydrogen flow, deposition position and different substrate) on deposition rate, deposition uniformity, microstructure and micro mechanical properties of zirconia coatings were studied; Ablation resistance of zirconia coatings and multi-coatings with zirconia were investigated and the ablation mechanism of zirconia coatings was concluded. The main conclusions are as follows:(1)The lowest temperature for the deposition of zirconia coatings in ZrCl4-CO2-H2-Ar system is816℃in terms of thermodynamics calculation,as the temperature increasing, the value of equilibrium constant increased so zirconia coatings deposited more easily.(2)Considering deposition rate and microstructure together, the best deposition parameters for zirconia coatings are1300℃,400ml/min Hydrogen flow and Continuous deposition.(3)The zirconia coatings combine better with C/C-SiC substrate than it with C/C-ZrC substrate and the surface scratch of ZrO2coatings on C/C-SiC substrate is smooth while it is rough on C/C-ZrC substrate.(4) The zirconia coatings have some protective effect as thermal barrier coating but it can hardly combined with the substrate so it spalled as it was heated.

Related Dissertations

  1. Preparation of Micro-Arc Oxidation Ceramic Coating on Mg Alloy and the Research of Galvanic Corrosion,TG174.453
  2. The Effect of Current Density and Electric Field on Ni and Its Alloy Electrodeposition for Copper Crystallizer,TQ153.2
  3. A Study on the Electrodeposition of Zn-Co and Zn-Ni Alloys in the Reline Room Temperature Ionic Liquid,TQ153.1
  4. Ceramic Theramal Sterss Cleaving Technology Based on Laser,TQ174.62
  5. Preparation and Anticorrosion Properties of Doped Polyaniline/Epoxy Coating,TQ637
  6. Preparation and Performance of V2O5-WO3/MOx/Cordierite Catalyst Modified with Cu、Mn、Ce for DeNOx,X701
  7. LSGM electrolyte thin films and electrochemical properties of,TM911.4
  8. Anti-corrosion Property of Flake Zinc Epoxy Coating Doped with Rare Earth in SRB,TQ630.1
  9. Research on PSA/Cotton Blend Fabric of Coatinging of Water Resistance and Moisture Permeability,TS195.6
  10. Study on Chitosan-Based Composiate Nano-Coating Dope and Its Effect of Fresh-Keeping for Coated Egg,TS253.2
  11. Development and Application of Biological Seed Coating Formulation for Soybean,S565.1
  12. 12-Tungstophosphoric Acid Modified-Zirconia Aerogel as a Solid Acid for THF Polymerization,TQ316.314
  13. Different metal base and binder zirconia all-ceramic crowns on the color of,R783
  14. Preparation of polyaniline nanostructures , characterization and biomedical applications,TB383.1
  15. The Effect of Core:veneer Thickness Ratio on the Flexural Strength of Layered Zirconia and Porceplain Dental Ceramic Materials,R783.1
  16. Preparation and Performances of Aluminum Oxide Coated Zirconia Composite Powders,TB383.3
  17. The Effect of Tungsten on Microstructures and Properties of Wear Resistant Overlays Prepared by Plasma Cladding,TG174.4
  18. Growth of Single-walled Carbon Nanotube Arrays and the Study of Their Adhesion Force,TB383.1
  19. Research on Microstructures and Properties of FeMnCrNiAlBSi/Cr3C2 Coatings,TG174.44
  20. Studies of Plasma Spray Metal-Ceramic Compounds Coatings on Q245r Steels,TG174.44
  21. Investigation of Plasma Sprayed NiCr-Cr3C2 Coating on Mould CrZrCu Alloy Plates,TG174.442

CLC: > Industrial Technology > General industrial technology > Materials science and engineering > General issues of engineering materials > Materials Corrosion and Protection
© 2012 www.DissertationTopic.Net  Mobile