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Incorporation of solid lubricants inthermally sprayed wear-resistantcoatings
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing.
2020 (English)Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

Thermal spray techniques continue to evolve every day to withstand some of the industry's surface engineering problems such as wear. This can be a huge issue, so wear resistant coatings are being developed and within the most common powders applied are WC-CoCr and NiCr-Cr3C2. Several spraying methods have been implemented in order to achieve advanced products on a wide range of industrial sectors (aerospace, power production, automotive, etc...). High Velocity Oxy Fuel (HVOF) can be considered the current state-of-art in the manufacturing of these coatings but High Velocity Air Fuel (HVAF) has the potential to provide additional benefits. This thesis report shows the open vista for the use of solid lubricants such as graphite, hex-agonal boron nitride, tungsten disulfide, molybdenum disulfide and calcium difluoride incor-porated to perform wear resistant coatings and studies the different methods that have already been examined before, mainly plasma spray and HVOF. At the same time, it offers a new possibility carrying out a High Velocity Air Fuel (HVAF) with hybrid feedstock method which combines liquid feedstock and suspensions of fine particles. The incorporation of these solid lubricants into the coatings is expected to fulfil the needs and to manage the reduction of the wear rates as well as the friction coefficients. The experimental part exhibits a case study carried out with NiCr-Cr3C2 powder and the addition of hexagonal boron nitride (hBN) as the solid lubricant in form of suspension done following the hybrid HVAF technique. With HVAF highly adherent coatings can be acquired and thanks to the low temperature used during the process, low oxidation and low decarburization is exhibited. The aim of this project is to show a literature review and in the experimental part to accom-plish good results on the tribological properties, proving that the addition of a solid lubricant brings to the coating a better performance on wear and therefore to the friction coefficient.

Place, publisher, year, edition, pages
2020.
Keywords [en]
Solid lubricant, thermal spray, HVAF, hBN
National Category
Manufacturing, Surface and Joining Technology
Identifiers
URN: urn:nbn:se:hv:diva-15335Local ID: EXM502OAI: oai:DiVA.org:hv-15335DiVA, id: diva2:1451739
Subject / course
Mechanical engineering
Educational program
Course
Supervisors
Examiners
Available from: 2020-07-20 Created: 2020-07-03 Last updated: 2025-09-30Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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Language
  • de-DE
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  • en-US
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  • nn-NO
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