Dissertation > Excellent graduate degree dissertation topics show

Plasma Sprayed Nanostructual Al2O3-13wt.%TiO2 Coating

Author: ZouYan
Tutor: YanDianRan
School: Hebei University of Technology
Course: Materials Science
Keywords: plasma spray nanostructured coating Al2O3-TiO2
CLC: TG174.442
Type: Master's thesis
Year: 2010
Downloads: 49
Quote: 0
Read: Download Dissertation

Abstract


Recently advanced engineering ceramics such as Al2O3 and TiO2 possess high hardness, high strength, chemical stability etc., which are widely studied and used. The Al2O3/TiO2 ceramic coatings deposited by plasma spray also have been applied in many fields as surface coating to improve wear, fretting and corrosion resistance. Compared with conventional ceramic coatings, nanostructured ceramic coating has a more excellent performance, and thus drawn more attention.In this paper, ceramic Al2O3-TiO2 system, as the subjects and carried out spray feed, the microstructure of powder and coatings were characterized by X-ray diffraction, scanning electron microscope. Their mechanical and wear performance were investigated, which were compared with those of the conventional counterpart. Obtained the following results:1. With nano-alumina and titanium dioxide as raw materials by spray-drying method, combined with high-temperature sintering technology, powders prepared by plasma spraying can be used for nanostructured Al2O3-13wt.% TiO2 feedstock. Prepared by spray feed excellent performance with high bulk density, good mobility, the smaller particle size distribution.2. Using plasma spray technology to prepare nanostructured Al2O3-13wt.% TiO2 coatings, alumina mainly containγ-Al2O3 phase, and a small amount ofα-Al2O3; did not find dioxide diffraction peak. Conventional coated with nanostructured coatings diffraction peaks similar to, but there is a small amount of Al2TiO5 phase.3. Nanostructured Al2O3-13wt.% TiO2 coating has a unique "two-state distribution structure", that there is complete melting the structure, they tend to melt some of the structure. Nanostructured coating melt completely as part of the conventional coating structure is similar to the main lamellar structure.4. With the conventional Al2O3-13wt.% TiO2 coating compared to the mechanical properties of nanostructured coating improved significantly. In the coatings prepared under different power, its micro-hardness with the increasing of power, nanostructured coating toughness than conventional coatings increased by 1/4.5. In the coating wear test, we found nanostructured Al2O3-13wt.% TiO2 coating wear better than conventional coating, and the two kinds of coating wear different mechanisms.

Related Dissertations

  1. Studies of Plasma Spray Metal-Ceramic Compounds Coatings on Q245r Steels,TG174.44
  2. Research on the Corrosion Mechanism of Ceramic Composite Coating in Molten Zinc,TG174.4
  3. Research on K2Ti6O13-based Bio-active Coating and Its Whisk Reinforced HA Bio-ceramic,R318.08
  4. Friction and Wear Properties of Bronze Alloy Powder Coatings,TF122
  5. The Experimental Research of Wear & Corrosion Resistant Technology for Partial Surface of the Piston Rod,TH117.1
  6. The development of the Robotic Grinding System Facing Plasma Spray Tooling and Its Experimental Research,TP242
  7. Study on Preparation of nanostructured thermal spray powder in Cr_2O_3 and wear-resistant coating,TB383
  8. Synthesis and Mechanical Properties of Nanostructured Ni-P/WC Coatings,TG174
  9. Hydroxyapatite Coatings Plasma Sprayed on Pure Titanium,TB34
  10. Study of the Microstructure and Properties of Plasma-Sprayed Nanostructured Al2O3-13wt.% TiO2 Coating,TG174.453
  11. Research on the Characteristics of Low-power Plasma Spraying Tungsten Carbide,TG174.4
  12. Research on Thermal Barrier Coatings TGO Growth Mechanism and Coatings Failure Mechanism,TG174.44
  13. Research on Surface Modification of Power Station Valve Steel,TG174.44
  14. Study on Nanocrystalline TiN Coatings Materials Prepared by the Reactive Plasma Spraying,TG174.442
  15. Fatigue Properties Improvement of Welded Structures by Plasma Spray Process,TG174
  16. Study on Optimun of Plasma Sprayed FGM,TG174.44
  17. Study on the Microstructures and Properties of Plasma-sprayed Al/Al2O3p Composite Coating on Magnesium Alloy,TG174.4
  18. Preparation and Study of ZrO2 Coatings Deposited by Solution-precuror Plasma Spray,TB304
  19. Preparation and Study of Thermal Barrier Coating Upon Titanium-Based Alloy,TG174.4
  20. Experimental Study on Material Mixture Ratio of Thermal Resistant Layer on Die Impression of Hot Forging Die,TG315.2
  21. Preparation of High-aluminum Bronze Powder and Study of Its Microstructure and Properties of Layers,TB383.3

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 > Spraying method
© 2012 www.DissertationTopic.Net  Mobile