Dissertation > Excellent graduate degree dissertation topics show

The Study of Microstructure and Performance of La2 O3+CeO2-Ni-WC Composite Coating by Vacuum Fusion Sintering

Author: DongJi
Tutor: WangYaNan
School: Liaoning University of Science and Technology
Course: Materials Processing Engineering
Keywords: Vacuum fusion sintering La2O3+CeO2 Ni-WC composite coating Heat temperature oxidation property
CLC: TG174.44
Type: Master's thesis
Year: 2009
Downloads: 5
Quote: 0
Read: Download Dissertation

Abstract


This paper made the Rare-earth Ni-based alloy WC composite coating on 45# steel substrate by vacuum fusion sintering technique. The surface patternmicrostructure and each phase’s chemical component of the Rare-earth Ni-based alloy WC composite coating were observed and analyzed by Scanning Electron Microscopy(SEM), Optical Microscope(OM) and Energy-Dispersive Spectrometer(EDS). And the hardness and the high temperature oxidation performance of composite coating were researched and analyzed by Rockwell hardometer,microhardness instrument,MTS810 and box-type resistance batch. Theresults showed that::(1)When the content of La2O3+CeO2 came up to 0.6% , the interact-melt associability between coating and matrix was the best,and the defects such as porosity,crack and so on was the least.(2) When the content of La2O3+CeO2 came up to 0.6%,the coatings’structure was smaller and more homogeneous,the fusion was the best,the coatings’hardnessand was the highest. When the content of La2O3+CeO2 came up to 0.6%,the coatings’tensile strength was the highest. The fracture is mixed with gliding frature and brittle fracture. The size of WC grain is become more refined and well distributed, when put into 0.6% La2O3+CeO2,the surface hardness, microhardness and the tensile strength value are improved efficiently. The surface hardness is up to HRC56.7, the microhardness is up to 906HV0.05, and the tensile strength is up to 380.12MPa.(3) According to GB/T13303-91 criterion,45# steel with coating was oxygenated at 800℃for 100h. According to Wanger oxidation experience formula,using the scatter date simulation computing method had gained oxidation kinetics equations,oxidation kinetics curve is drawn by Origin software. The grain size of the coatings with 0.8% ,the coatings’heat temperature oxidation property was the best.

Related Dissertations

  1. Research on Surface Modification of Power Station Valve Steel,TG174.44
  2. Study on the Preparation and Properties of Vacuum Fusion Sintered WC/Ni and WC/Co Composite Coatings,TG174
  3. The Effect of Heat Treatment on Microstructure and Performance of Ni-WC Coating Formed by Vacuum Fusion Sintering,TG156
  4. The Study on the Thermal Properties and Corrosion Resistance of Vacuum Sintering Ni-based Cermet Composite Coating with Rare Earth Joined,TG174.4
  5. Research on the Thermal Properties and Corrosion Resistance of Vacuum Sintering Nickel-based--Cermet Composite Coating with Rare Earth,TG174
  6. Research on Microstructures and Properties of FeMnCrNiAlBSi/Cr3C2 Coatings,TG174.44
  7. Studies of Plasma Spray Metal-Ceramic Compounds Coatings on Q245r Steels,TG174.44
  8. Research on Laser Cladding 4169 Superalloy Coating,TG174.44
  9. SCH13 steel surface micro - arc deposition and cladding Enhancement Technique,TG174.44
  10. Preparation of pre- infiltrated ceramic lining layer technology,TG174.44
  11. Valve material surface modification layer prepared a variety of techniques Study,TG174.44
  12. NiTi alloy coated stainless steel surface preparation,TG174.44
  13. HVOF corrosion -resistant zinc coating materials research,TG174.44
  14. Porcelain surface lining layer performance and organizational analysis,TG174.44
  15. Electrothermal explosion spraying Molybdenum Coating and Performance,TG174.44
  16. Medical magnesium alloy surface laser cladding Zr 60 Ti 6 Cu 19 Fe 5 Al 10 amorphous coating,TG174.44
  17. Study on Properties of Solid Particle Erosion Resistance CrN_X Coating,TG174.44
  18. Substrate Surface alloying coating microstructure and properties of hot dip galvanized sheet,TG174.44
  19. The Powdering Mechanisem Research of Galvannealed Steel Sheet Coating in Forming,TG174.44
  20. Study of the Effect of Aluminum Powders Activant on Mechanically Deposited Process of Zinc-aluminum Alloy,TG174.44

CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metal corrosion protection,metal surface treatment > Corrosion control and protection > Metal surface protection technology > Metal complex layer of protection
© 2012 www.DissertationTopic.Net  Mobile