Wear behaviour of high velocity suspension flame sprayed (HVSFS) Al2O3 coatings produced using micron- and nano-sized powder suspensions
作者： G. Bolelli , B. Bonferroni , V. Cannillo , R. Gadow , A. Killinger
DOI: 10.1016/J.SURFCOAT.2010.02.018
关键词:
摘要: Abstract Three Al 2 O 3 -based suspensions were prepared using two nano-sized powders (having analogous size distribution and chemical composition but different agglomeration behaviour) a micron-sized one. High velocity suspension flame sprayed (HVSFS) coatings produced these as feedstock adopting sets of deposition parameters. The by the micrometric powder are denser more wear resistant (as revealed ball-on-disk testing) than those deposited nanopowder suspensions, irrespective tribological behaviour all is dictated formation subsequent removal surface tribofilms: tribofilms stable in obtained suspension, although they exhibit largest tensile residual stress determined X-ray diffraction hole drilling techniques). Even though as-deposited quite smooth (Ra ∼ 1.3–2 μm), polishing to Ra ∼ 0.1 μm further improves resistance cases, it delays onset tribofilm delamination phenomena.
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