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Effect of N-2 and He Carrier Gases on Oxidation Behavior of Cold Sprayed CoNiCrAlY Powder to Deposit Bond Coats

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Title Effect of N-2 and He Carrier Gases on Oxidation Behavior of Cold Sprayed CoNiCrAlY Powder to Deposit Bond Coats
 
Creator RATHOD, WS
KHANNA, AS
KARTHIKEYAN, J
RATHOD, RC
 
Subject Cold gas dynamic spray (CGDS)
Oxidation
Bond coat
Spinal
Porosity
KINETIC SPRAY
COATINGS
HVOF
PARTICLES
 
Description CoNiCrAlY has been cold sprayed onto 316L substrate using helium and nitrogen as carrier gases. CGDS with helium gas under the temperature of 400 A degrees C and pressure of 20 bars and CGDS with nitrogen gas under the temperature of 450 A degrees C and pressure of 38 bars were used. The purpose of the current study was to investigate the microstructure and oxidation behavior of CoNiCrAlY coatings deposited by CGDS technique with both carrier gases. The quality of the as-sprayed and oxidized bond coats was assessed and investigated from the point of view of microstructural (porosity and oxide concentration) and mechanical properties (hardness) characteristics. Sprayed samples were exposed to isothermal oxidation at 900 A degrees C in air. Oxide growth rates were obtained from a series of mass gain measurement while oxide scale compositions were determined using SEM, XRD and EDX analysis. Helium processing condition displays more compact structure for the coating when compared to N-2. The oxide scale on the CGDS sprayed with He coating after 1,000 h of oxidation is composed of alumina without the presence of detrimental fast growing mixed oxides. Results obtained in this study show that CGDS sprayed with N-2 coating features high levels of visible defects, oxide content, spinal-type oxide and high oxide growth rate, whereas CGDS with He shows low oxide growth rate due to low porosity and oxide content.
 
Publisher SPRINGER INDIA
 
Date 2014-12-28T09:13:54Z
2014-12-28T09:13:54Z
2014
 
Type Article
 
Identifier TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS, 67(2)247-262
0972-2815
0975-1645
http://dx.doi.org/10.1007/s12666-013-0344-9
http://dspace.library.iitb.ac.in/jspui/handle/100/16259
 
Language English