NDLI: Dense Si$_{3}$N$_{4}$ coatings with high friction coefficient deposited by high-velocity pulsed plasma spraying

Content Provider	Springer Nature Link
Author	Usuba, S. Heimann, R. B.
Copyright Year	2006
Abstract	A novel electromagnetically accelerated plasma spraying technique was applied to mixtures of αSi$_{3}$N$_{4}$, and alumina, yttria, and silica additives to deposit thin coatings (50–100 μm) onto mirror-polished stainless steel surfaces. The dense coatings consisted of crystalline αSi$_{3}$N$_{4}$ with minor amounts of β'SiAlON, traces of βSi$_{3}$N$_{4}$ and Y$_{3}$Al$_{5}$O$_{12}$ as well as a quinary Si−Al−N−O−Y glass. The adhesion strengths depended on the powder particle size showing values of>77 MPa for coarse powders (median grain size 25 μm) and>67 MPa for fine powders (median grain size 8 μm). The average indentation hardnesses were 450 HV$_{0.025}$ (coarse powder) and 620 HV$_{0.025}$ (fine powder); the sliding wear resistances were comparable to those of sintered Si$_{3}$N$_{4}$ used as counterbody in a pin-on-disc friction test. The friction coefficient showed surprisingly large values (1.0–1.1 in water and 1.3–1.4 in air), suggesting application of such coatings as tribological high-friction surfaces.
Starting Page	356
Ending Page	363
Page Count	8
File Format	PDF
ISSN	10599630
Journal	Journal of Thermal Spray Technology
Volume Number	15
Issue Number	3
e-ISSN	15441016
Language	English
Publisher	Springer-Verlag
Publisher Date	2006-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	electromagnetically accelerated plasma spraying friction coefficient hardness microstructure silicon nitride coatings sliding wear Surfaces and Interfaces, Thin Films Tribology, Corrosion and Coatings Materials Science Characterization and Evaluation of Materials Operating Procedures, Materials Treatment Analytical Chemistry
Content Type	Text
Resource Type	Article
Subject	Surfaces, Coatings and Films Materials Chemistry Condensed Matter Physics

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