NDLI: Improved Protection Properties by Using Nanostructured Ceramic Powders for HVOF Coatings

Content Provider	Springer Nature Link
Author	Varis, T. Knuuttila, J. Turunen, E. Leivo, J. Silvonen, J. Oksa, M.
Copyright Year	2007
Abstract	The potential of the high-velocity oxy-fuel (HVOF) thermal spray process for reduced porosity in coatings compared to those produced by other ambient thermal spray processes is well known. The ability to produce high-density ceramic coatings offers potential in high-performance applications in the field of wear, corrosion resistance, and dielectric coatings. However, due to operational limit of the HVOF process to effectively melt the ceramic particles, the process—structure relationship must be well optimized. It has been also demonstrated that benefits from HVOF ceramic coatings can be obtained only if particles are melted enough and good lamella adhesion is produced. One strategy to improve melting of ceramic particles in relative low-flame temperatures of HVOF process is to modify particle crystal structure and composition. In this paper the effect of the powder manufacturing method and the composition on deposition efficiency of spray process as well as on the mechanical properties of the HVOF sprayed are studied. Effect of fuel gas, hydrogen vs. propane, was also demonstrated. Studied materials were alumina-, chromia-, and titania-based agglomerated powders. Coating properties such as microstructure, hardness, abrasive wear resistance, and relative fracture toughness were compared to the coating manufactured by using conventional fused and crushed powders. It can be concluded that powder size distribution and microstructure should be optimized to fulfill process requirements very carefully to produce coatings with high deposition efficiency, dense structure, improved fracture toughness, and adhesion.
Starting Page	524
Ending Page	532
Page Count	9
File Format	PDF
ISSN	10599630
Journal	Journal of Thermal Spray Technology
Volume Number	16
Issue Number	4
e-ISSN	15441016
Language	English
Publisher	Springer US
Publisher Date	2007-10-18
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	fatigue and fracture HVOF microstructures nanocrystalline composites nano-powders production/preparation technology testing Analytical Chemistry Operating Procedures, Materials Treatment Characterization and Evaluation of Materials Materials Science Tribology, Corrosion and Coatings Surfaces and Interfaces, Thin Films
Content Type	Text
Resource Type	Article
Subject	Surfaces, Coatings and Films Materials Chemistry Condensed Matter Physics

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