NDLI: Effect of Feedstock Size and its Distribution on the Properties of Detonation Sprayed Coatings

Content Provider	Springer Nature Link
Author	Suresh Babu, P. Rao, D. S. Rao, G. V. N. Sundararajan, G.
Copyright Year	2007
Abstract	The detonation spraying is one of the most promising thermal spray variants for depositing wear and corrosion resistant coatings. The ceramic (Al$_{2}$O$_{3}$), metallic (Ni-20 wt%Cr) , and cermets (WC-12 wt%Co) powders that are commercially available were separated into coarser and finer size ranges with relatively narrow size distribution by employing centrifugal air classifier. The coatings were deposited using detonation spray technique. The effect of particle size and its distribution on the coating properties were examined. The surface roughness and porosity increased with increasing powder particle size for all the coatings consistently. The feedstock size was also found to influence the phase composition of Al$_{2}$O$_{3}$ and WC-Co coatings; however does not influence the phase composition of Ni-Cr coatings. The associated phase change and %porosity of the coatings imparted considerable variation in the coating hardness, fracture toughness, and wear properties. The fine and narrow size range WC-Co coating exhibited superior wear resistance. The coarse and narrow size distribution Al$_{2}$O$_{3}$ coating exhibited better performance under abrasion and sliding wear modes however under erosion wear mode the as-received Al$_{2}$O$_{3}$ coating exhibited better performance. In the case of metallic (Ni-Cr) coatings, the coatings deposited using coarser powder exhibited marginally lower-wear rate under abrasion and sliding wear modes. However, under erosion wear mode, the coating deposited using finer particle size exhibited considerably lower-wear rate.
Starting Page	281
Ending Page	290
Page Count	10
File Format	PDF
ISSN	10599630
Journal	Journal of Thermal Spray Technology
Volume Number	16
Issue Number	2
e-ISSN	15441016
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2007-04-26
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Al$_{2}$O$_{3}$ fracture toughness Ni-Cr thermal spray tribological properties WC-Co 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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