TITLE

Comparative Characteristic and Erosion Behavior of NiCr Coatings Deposited by Various High-Velocity Oxyfuel Spray Processes

AUTHOR(S)
Sidhu, Hazoor Singh; Sidhu, Buta Singh; Prakash, S.
PUB. DATE
December 2006
SOURCE
Journal of Materials Engineering & Performance;Dec2006, Vol. 15 Issue 6, p12
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The purpose of this study is to analyze and compare the mechanical properties and microstructure details at the interface of high-velocity oxyfuel (HVOF)-sprayed NiCr-coated boiler tube steels, namely ASTM-SA-210 grade A1, ASTM-SA213-T-11, and ASTM-SA213-T-22. Coatings were developed by two different techniques, and in these techniques liquefied petroleum gas was used as the fuel gas. First, the coatings were characterized by metallographic, scanning electron microscopy/energy-dispersive x-ray analysis, x-ray diffraction, surface roughness, and microhardness, and then were subjected to erosion testing. An attempt has been made to describe the transformations taking place during thermal spraying. It is concluded that the HVOF wire spraying process offers a technically viable and cost-effective alternative to HVOF powder spraying process for applications in an energy generation power plant with a point view of life enhancement and to minimize the tube failures because it gives a coating having better resistance to erosion.
ACCESSION #
23703429

 

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