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Advanced Coatings by Thermal Spray Processes
University West, Department of Engineering Science, Research Enviroment Production Technology West.ORCID iD: 0000-0001-5521-6894
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing.ORCID iD: 0000-0001-7787-5444
2019 (English)In: Technologies, Vol. 7, no 4, article id 79Article in journal (Refereed) Published
Abstract [en]

Coatings are pivotal in combating problems of premature component degradation in aggressive industrial environments and constitute a strategic area for continued development. Thermal spray (TS) coatings offer distinct advantages by combining versatility, cost-effectiveness, and the ability to coat complex geometries without constraints of other in-chamber processes. Consequently, TS techniques like high-velocity oxy-fuel (HVOF) and atmospheric plasma spray (APS) are industrially well-accepted. However, they have reached limits of their capabilities while expectations from coatings progressively increase in pursuit of enhanced efficiency and productivity. Two emerging TS variants, namely high-velocity air-fuel (HVAF) and liquid feedstock thermal spraying, offer attractive pathways to realize high-performance surfaces superior to those hitherto achievable. Supersonic HVAF spraying provides highly adherent coatings with negligible porosity and its low processing temperature also ensures insignificant thermal ‘damage’ (oxidation, decarburization, etc.) to the starting material. On the other hand, liquid feedstock derived TS coatings, deposited using suspensions of fine particles (100 nm–5 µm) or solution precursors, permits the production of coatings with novel microstructures and diverse application-specific architectures. The possibility of hybrid processing, combining liquid and powder feedstock, provides further opportunities to fine tune the properties of functional surfaces. These new approaches are discussed along with some illustrative examples.

Place, publisher, year, edition, pages
2019. Vol. 7, no 4, article id 79
Keywords [en]
coatings, high-velocity air-fuel, plasma spray, solution precursor, suspension
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-14702DOI: 10.3390/technologies7040079OAI: oai:DiVA.org:hv-14702DiVA, id: diva2:1370480
Available from: 2019-11-15 Created: 2019-11-15 Last updated: 2019-11-15

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Joshi, Shrikant V.Nylén, Per
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