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Microstructural Characterization of Small‐Particle Plasma Spray Coatings
Author(s) -
ArellanoLópez Antonio R.,
Faber K. T.
Publication year - 1999
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1999.tb02063.x
Subject(s) - microstructure , materials science , transmission electron microscopy , scanning electron microscope , coating , focused ion beam , particle (ecology) , composite material , thermal spraying , particle size , substrate (aquarium) , gas dynamic cold spray , metallurgy , chemical engineering , nanotechnology , ion , chemistry , oceanography , organic chemistry , geology , engineering
The microstructure of a small‐particle plasma spray (SPPS) aluminum oxide coating sprayed onto a prepared mild steel substrate has been characterized using a variety of microscopic techniques as part of a process optimization study. The coating was highly conforming to the substrate as evidenced in high‐resolution transmission electron microscopy, although some voids were present at the interface. The layered splat microstructure, characteristic of conventional plasma‐sprayed coatings but smaller in size, was discerned in partially thinned samples in a focused‐ion‐beam scanning electron microscope (FIB‐SEM). Microcracks and microporosity, generally less than 0.5 µm in size, was also seen between splats using transmission electron microscopy. Cubic alumina of the crystallographic form gamma‐Al 2 O 3 was identified by electron diffraction.