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TitleImproving tribological properties of cast Al-Si alloys through application of wear-resistant thermal spray coatings
Author(s)Culliton, David
Betts, Anthony
Carvalho, S.
Kennedy, David
Microscale abrasion
Non-ferrous metals
Thermal spray coatings
Three-body abrasion
Two-body abrasion
Issue dateApr-2013
JournalJournal of Thermal Spray Technology
Abstract(s)Flame Spray Thermal Spray coatings are low-cost, high-wear surface-treatment technologies. However, little has been reported on their potential effects on cast automotive aluminum alloys. The aim of this research was to investigate the tribological properties of as-sprayed NiCrBSi and WC/12Co Flame Spray coatings applied to two cast aluminum alloys: high-copper LM24 (AlSi8Cu3Fe), and low-copper LM25 (AlSi7Mg). Potential interactions between the mechanical properties of the substrate and the deposited coatings were deemed to be significant. Microstructural, microhardness, friction, and wear (pin-on-disk, microabrasion, Taber abrasion, etc.) results are reported, and the performance differences between coatings on the different substrates were noted. The coefficient of friction was reduced from 0.69-0.72 to 0.12-0.35. Wear (pin-on-disk) was reduced by a factor of 103-104, which was related to the high surface roughness of the coatings. Microabrasion wear was dependent on coating hardness and applied load. Taber abrasion results showed a strong dependency on the substrate, coating morphology, and homogeneity.
AccessOpen access
Appears in Collections:CDF - GRF - Artigos/Papers (with refereeing)

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