FIB assisted study of plasma sprayed splat–substrate interfaces: NiAl–stainless steel and alumina–NiAl combinations

This paper deals with the splat–substrate and intersplat interfaces of splats produced from Ni–5 wt.% Al and alumina based ceramic powders. The cross section of the splat–substrate interface was studied using a focused ion beam (FIB) assisted Field Emission Scanning Electron Microscope (FE-SEM). The...

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Bibliographic Details
Published in:Surface & coatings technology 2010-01, Vol.205 (2), p.363-371
Main Authors: Bolelli, G., Sabiruddin, Kazi, Lusvarghi, L., Gualtieri, E., Valeri, S., Bandyopadhyay, P.P.
Format: Article
Language:English
Subjects:
Agglomeration
Alumina
Aluminum
Aluminum oxide
Applied sciences
Cracks
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Field emission
Focused ion beam (FIB)
Intermetallics
Materials science
Metals. Metallurgy
Nanostructure
Nickel aluminides
Ni–Al
Physics
Plasma spraying
Production techniques
Residual stress
Scanning electron microscopy
Splat
Steels
Surface treatment
Surface treatments
Wettability
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Summary:This paper deals with the splat–substrate and intersplat interfaces of splats produced from Ni–5 wt.% Al and alumina based ceramic powders. The cross section of the splat–substrate interface was studied using a focused ion beam (FIB) assisted Field Emission Scanning Electron Microscope (FE-SEM). The metallic splat showed good interfacial integrity apart from a few interfacial pores resulting from entrapped gases and edge curl resulting from quenching stresses. The ceramics showed generally well adherent interfaces for both single and multilayer splats. Good adherence of both alumina splats was attributed to the improved wettability provided by the bond coat. One kind of alumina splats, namely, those obtained from agglomerated nanostructured powder was found to be free from crack and edge curl. This was attributed to the presence of a glassy phase in this splat, which can absorb quenching stresses.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2010.06.057