Thermally sprayed quaternary Al-Sn based alloys for applications in automotive journal bearings

T. Marrocco, L. C. Driver, D. Graham McCartney, S. J. Harris

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

1 Citation (Scopus)

Abstract

Al-20wt%Sn-1%Cu coatings have been produced by high velocity oxy-fuel (HVOF) thermal spraying onto steel sheet, and then fabricated into shell bearings for use in automotive engines. To seek further improvements in the bearings, quaternary alloy coatings were prepared from gas atomised Al-20Sn-1Cu-2Ni and Al-20Sn-1Cu-7Si powders. The powders and coatings were characterised by SEM, TEM and XRD. Microhardness and wear properties were measured on the coated samples. As-sprayed deposits contained splats which had been either fully molten or partially melted during flight. These contained a β-Sn phase dispersed as 50-200 nm particles on solidification. The Ni containing powders had a Ni-containing phase present, which was reduced in quantity during spraying and partially restored during post-spray annealing at 300°C. Coating hardness decreased from 120 to 70Hv whilst annealing. Si was present in the powder and in the assprayed and heat treated Al-Sn-Cu-Si coatings. Si in the powder was 1-5 μm in size but this was greatly reduced in the coatings. XRD and TEM provided evidence of Si precipitation in heated treated coatings. The microhardness of the as-sprayed coating was ∼130Hv and this reduced to ∼65Hv after heat treatment. Wear resistance of the annealed Si containing coatings was superior to those of Al-Sn-Cu and Al-Sn-Cu-Ni coatings.

Original languageEnglish
Title of host publicationAluminium Alloys 2006
Subtitle of host publicationResearch Through Innovation and Technology - Proceedings of the 10th International Conference on Aluminium Alloys
Pages1317-1322
Number of pages6
DOIs
Publication statusPublished - 31 Jul 2006
Event10th International Conference on Aluminium Alloys, (ICAA-10) - Vancouver, Canada
Duration: 9 Jul 200613 Jul 2006

Publication series

NameMaterials Science Forum
NumberPART 2
Volume519-521
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752

Conference

Conference10th International Conference on Aluminium Alloys, (ICAA-10)
Country/TerritoryCanada
CityVancouver
Period9/07/0613/07/06

Keywords

  • aluminium-tin bearings
  • heat treatment
  • high velocity oxy-fuel spraying
  • microstructure
  • rapid cooling
  • wear resistance

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