NDLI: Fabrication of Oxide Dispersion Strengthened Bond Coats with Low Al$_{2}$O$

Content Provider	Springer Nature Link
Author	Bergholz, Jan Pint, Bruce A. Ucic, Kinga A. Vaßen, Robert
Copyright Year	2017
Abstract	Nanoscale oxide dispersions have long been used to increase the oxidation and wear resistance of alloys used as bond coatings in thermal barrier coatings. Their manufacturing via mechanical alloying is often accompanied by difficulties regarding their particle size, homogeneous distribution of the oxide dispersions inside the powder, involving considerable costs, due to cold welding of the powder during milling. A significant improvement in this process can be achieved by the use of process control agent (PCA) to achieve the critical balance between cold welding and fracturing, thereby enhancing the process efficiency. In this investigation, the influence of the organic additive stearic acid on the manufacturing process of Al$_{2}$O$_{3}$-doped CoNiCrAlY powder was investigated. Powders were fabricated via mechanical alloying at different milling times and PCA concentrations. The results showed a decrease in particle size, without hindering the homogeneous incorporation of the oxide dispersions. Two powders manufactured with 0.5 and 1.0 wt.% PCA were deposited by high velocity oxygen fuel (HVOF) spraying. Results showed that a higher content of elongated particles in the powder with the higher PCA content led to increased surface roughness, porosity and decreased coating thickness, with areas without embedded oxide particles.
Starting Page	868
Ending Page	879
Page Count	12
File Format	PDF
ISSN	10599630
Journal	Journal of Thermal Spray Technology
Volume Number	26
Issue Number	5
e-ISSN	15441016
Language	English
Publisher	Springer US
Publisher Date	2017-03-23
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	bond coats mechanical alloying oxide dispersion strengthened process control agent thermal barrier coatings thermal spraying Surfaces and Interfaces, Thin Films Tribology, Corrosion and Coatings 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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