Dissertation > Excellent graduate degree dissertation topics show

Research on NiCoCrAlY Suface Modified Layers of the TiAl Based Alloy by Double Glow Plasma Surface Alloying Technique

Author: ZhouPeng
Tutor: ZhangPingZe
School: Nanjing University of Aeronautics and Astronautics
Course: Materials Science
Keywords: The TiAl based alloy double glow plasmasurface alloying technique NiCoCrAlY wear resistance high temperature anti-oxidation ability
CLC: TG174.445
Type: Master's thesis
Year: 2013
Downloads: 6
Quote: 0
Read: Download Dissertation

Abstract


The TiAl based alloy offer attractive properties such as low density, high specific strength andhigh elastic modulus. Its working temperature is closely up to Ni based alloy，while the density ofTiAl is a half of Ni based alloy. Therefore the TiAl based alloy is recognized as one of the promisinghigh temperature structural materials and used for a wide applications for example the advancedaerospace and automotive engine components. However，the key problems in the practical use of theTiAl based alloy are its poor wear resistance and high-temperature oxidation resistance.In order to improve wear resistance and high-temperature oxidation resistance of the TiAl basedalloy, NiCoCrAlY surface alloyed layer was formed on the surface of TiAl based alloy by doubleglow plasma surface alloying technique. The alloying elements, which are feeded to the surface of thesubstrate by mutual diffusion mechanisms, were distributed gradedly. So the alloy layer ismetallurgically bonded to the substrate without spalling. The double glow plasma surface alloyingtechnique became a new surface modification technology of the TiAl based alloy. The microstructure，composition and phase structure of the surface modified layers will be analyzed by means of OM、GDS、XRD and SEM respectively and the hardness、wear resistance(at room and elevatedtemperatures) and high-temperature oxidation resistance will be tested too.The results shows that (1) the better modified layers can be acquired under specificallytechnological parameters， the composition of the surface modified layer presented gradientdistributing from the surface to interior of the TiAl substrate，the modified layer is metallurgicallybonded to the TiAl substrate;(2) The hardness of the TiAl based alloy was double that of the TiAlsubstrate, and the alloy layer are proved to be beneficial to the wear resistance, which improve thewear resistance of the TiAl substrate.(3) in the oxidation test, a dense oxidation film is formed on thesurface of NiCoCrAlY surface alloyed layer, which remarkably improved the high temperatureanti-oxidation ability of the TiAl based alloy.

Related Dissertations

  1. Research and Development of Wear Resistance for Physically Disabled Men Jackets,TS941.2
  2. The Effect of Tungsten on Microstructures and Properties of Wear Resistant Overlays Prepared by Plasma Cladding,TG174.4
  3. Development of Cr-Mo Alloy Steels for Liner Applications and Assessment of Its Wear Resistance,TG335.5
  4. Influence of Ni-P Electroless Platting on 6063 Aluminum Alloy and Research on Modification of YG8 Hard Alloy after High Current Pulsed Electron Beam Irradiation,TQ153.1
  5. Preparation and Properties of Reactive Thermal Sprayed Ternary Boride Cermet Coatings,TG174.4
  6. Study on Preparation Technology and Properties of Al2O3-TiB2 Solid-state Reaction Multiphase Ceramic Coating on AZ31B Alloy,TG174.44
  7. The Comparative Study on Ni-P and Ni-Ce/W-P Electroless Plating and Coating Performance on 27SiMn Steel,TQ153.12
  8. Structure and Performance of Fe-based Amorphous Coatings Prepared by HVAF and HVOF,TG174.4
  9. The Study on Microstructure and Properties of Textile Steel Ring,TG142.1
  10. The Research on Wear Behavior of High Chromium White Cast Iron and 7CrMnMoS Steel,TG143.1
  11. Study on High Wear-Resistant Alloy Steel Flux Cored Wires for Arc Spraying and Its Application,TG422.3
  12. 15Cr2Ni3MoW head steel oxidation behavior and performance of the organization of the oxide film,TG174.44
  13. Mold material laser surface hardening technology research,TG156.99
  14. The Investigation on the Microstructure and Wear Mechanism of In-Situ Synthesis TI（C,N）-TIB2 Particulates Reinforce Metal-matrix Composite Coatings,TG174.44
  15. Study and Development of Material about Vanadium and Titanium Vermicular Cast Iron Automobile Brake Drum and Casting Design,TG255
  16. Application of Open Arc Welding in Casting Rolls Repair,TG455
  17. Preparation and Properties of Functional Composite Coatings Embedded ZrO2 Ceramic Particles,TG174.4
  18. Microstructures and Performance of Plasma Cladding High-Chromium Iron-Base Wear Resistant Coating by the Precursor Carbonization-Composition Process,TG174.4
  19. Application of Data Mining in the Preparation of the Ceramic Coating,TG174.453
  20. Surface Modification of AZ31 Magnesium Alloy and Pure Titanium by High Current Pulsed Electron Beam,TG166.4
  21. Study on the Performance of New Type Low Alloy Martensitic Wear Resistance Steel with High Strength and High Toughness,TG142.72

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 > The surface alloying ( surface alloying )
© 2012 www.DissertationTopic.Net  Mobile