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Microstructure and Tribological Performance of HVAF-Sprayed Ti-6Al-4V Coatings
University West, Department of Engineering Science, Division of Production Systems. Kwara State University, Ilorin (NGA). (KAMPT)ORCID iD: 0000-0001-9038-2281
University West, Trollhättan (SWE).
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (KAMPT)
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (KAMPT)ORCID iD: 0000-0003-1732-6544
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2023 (English)In: Coatings, ISSN 2079-6412, Vol. 13, no 11, p. 1-15Article in journal (Refereed) Published
Abstract [en]

Ti-6Al-4V is a widely used titanium alloy in aviation and bio/chemical applications for its attractive mechanical and corrosion resistance properties. The use of Ti-6Al-4V as a coating for repair purposes through thermal spray techniques provides a unique productivity opportunity. A repair coating must be dense to provide the required in-service functionalities, such as resistance to wear. The High Velocity Air Fuel (HVAF) thermal spray technique deposits dense coatings with reduced concern for oxide inclusions. This work presents an investigation of the microstructure, dry sliding, and solid particle erosive wear performance of four different coatings engineered through the configuration of the nozzle of an HVAF spray gun, based on the length of the nozzle and the size of the nozzle exit. A long nozzle length and wide nozzle exit mean increased inflight dwell time and reduced average inflight temperature for the sprayed particles, respectively—a reversed configuration means the opposite. The tested coatings showed a porosity of less than 2%. The sliding and erosion wear performance of the densest of the coatings compares to that of the bulk material tested under the same conditions. Electron microscopy was used to investigate the driving mechanisms for the performance of the respective coatings. The implications of the results are discussed for the potential adoption of HVAF-sprayed coatings in metal component repair.

Place, publisher, year, edition, pages
MDPI, 2023. Vol. 13, no 11, p. 1-15
Keywords [en]
Ti-6Al-4V; HVAF thermal spray; sliding wear; erosion wear; microstructure
National Category
Manufacturing, Surface and Joining Technology
Research subject
Production Technology
Identifiers
URN: urn:nbn:se:hv:diva-21055DOI: 10.3390/coatings13111952ISI: 001107849600001Scopus ID: 2-s2.0-85177861893OAI: oai:DiVA.org:hv-21055DiVA, id: diva2:1822664
Funder
Vinnova, 2020-02997
Note

CC BY 4.0

This article belongs to the Special Issue Mechanical Properties and Tribological Behavior of Alloy/Coatings

Available from: 2023-12-27 Created: 2023-12-27 Last updated: 2024-01-26

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Owoseni, Tunji A.Mathiyalagan, SribalajiBjörklund, StefanJoshi, Shrikant V.

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