HVOF thermal sprayed coatings on aluminium alloys and aluminium matrix composites

Picas, Josep A.; Forn, Antonio; Rilla, Ramiro; Martín, Enric

doi:10.1016/j.surfcoat.2005.02.124

Cited by 56 publications

(25 citation statements)

References 4 publications

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“…They are also being proposed for plastic injection moulds, thanks to their low density (lower weight of the mould) and high thermal conductivity (more uniform temperature distribution on the mould surfaces) [2,3]. The main drawback of Al alloys is their poor tribological behaviour [2][3][4][5]: Al alloy components having to withstand contact conditions must necessarily be coated or surface-treated. Consequently, protective coatings on Al alloys are a subject of considerable technological interest.…”

Section: Introductionmentioning

confidence: 99%

“…Accordingly, WC-based coatings on steel substrates have already been technically validated as an alternative to hard chrome plating, particularly for the most severe operating conditions [13,14,16,18]. The nature of the substrate (for instance, steel vs. aluminium), generally speaking, can affect the outcome of every coating process, but, in the case of thermal spraying techniques, this influence is not too large, so that it may be reasonably conjectured that HVOF-sprayed WC-based coatings can also offer good tribological properties when deposited onto Al substrates [2], even though some differences, in comparison to the traditional steel substrates, are likely to exist. Research studies concerning WC-based HVOFsprayed coatings on light alloys (Al alloys or Mg alloys) are therefore being carried out [2][3][4][19][20][21][22], but they are still not very numerous.…”

Section: Introductionmentioning

confidence: 99%

“…The nature of the substrate (for instance, steel vs. aluminium), generally speaking, can affect the outcome of every coating process, but, in the case of thermal spraying techniques, this influence is not too large, so that it may be reasonably conjectured that HVOF-sprayed WC-based coatings can also offer good tribological properties when deposited onto Al substrates [2], even though some differences, in comparison to the traditional steel substrates, are likely to exist. Research studies concerning WC-based HVOFsprayed coatings on light alloys (Al alloys or Mg alloys) are therefore being carried out [2][3][4][19][20][21][22], but they are still not very numerous. One very important aspect, which has not been explicitly considered yet in the above-mentioned studies, is the effect of the coating thickness on its properties, in particular on the tribological performance: this issue is particularly critical when dealing with soft substrates, as Al alloys are.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

HVOF-sprayed WC–CoCr coatings on Al alloy: Effect of the coating thickness on the tribological properties

Bolelli

Lusvarghi

Barletta

2009

Wear

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a b s t r a c tThe microstructure, the micromechanical properties, the wear behaviour and the impact resistance of WC-CoCr cermet coatings, deposited onto an aluminium alloy substrate by High Velocity Oxygen-Fuel (HVOF) flame-spraying, were examined as a function of the coating thickness, which was varied between 50 m and 150 m by performing different numbers of scans of the HVOF torch in front of the substrate. The coatings became denser and significantly harder as the number of torch scans increased: the analysis of single WC-CoCr splats by combined SEM and Focused Ion Beam (FIB) techniques enabled the interpretation of the mechanisms underlying this phenomenon. In accordance to such densification, the sliding wear resistance increased with the number of torch scans, as abrasive grooving and brittle failure mechanisms were progressively suppressed. The resistance to cyclic impact was also enhanced. In comparison to anodised films, the WC-CoCr coatings appeared much more resistant against wear and cyclic impact; specifically, three torch scans seem enough to produce a coating having suitable characteristics.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

HVOF-sprayed WC–CoCr coatings on Al alloy: Effect of the coating thickness on the tribological properties

Bolelli

Lusvarghi

Barletta

2009

Wear

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“…Life cycle of coatings can be easily measure by wear tests. Thus, the complex parts can be produced for a lower cost owing to the design flexibility of the soft materials [12][13][14][15][16][17][18][19][20]. In this study, 8 wt.% Y2O3 stabilized zirconia powders (YSZ) were coated onto T6 heat treated aluminum alloys surface with plasma spraying method and the wear resistance values of these coated samples were compared with the uncoated ones.…”

Section: Introductionmentioning

confidence: 99%

Friction and Wear Properties of Plasma Sprayed YSZ/Ni-Cr-Al Coated 6063-T6 Aluminum Alloy

Erzi

Dışpınar

Yılmaz

2017

Archives of Foundry Engineering

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In this study T6 heat treated 6063 aluminum alloys were used as substrate material. In order to form a bond between the substrate and the main coating, all samples were coated with Ni-Cr-Al powders. 8 wt% Yttria Stabilized Zirconia powders (YSZ) were coated with plasma spray technique. Thickness of YSZ was 150 m and bond coating was 36 m. XRD and SEM-EDS analyses were performed to characterize the coating layers. These YSZ coated and uncoated samples were subjected to wear testing under different spindle speed, loading and working distance. Wear test results were compared with the kinetic friction coefficients and weight loss values. Wear marks on YSZ coated and uncoated samples were investigated by SEM analysis. By coating with plasma spray technique, the wear resistance of Al alloys was increased without changing the friction coefficient. It was found that spindle speed had significant effect over the wear properties than the load applied. By YSZ coating, wear properties were increased 10 times.

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“…This enables the glass particles to be fused in the jet, while the metal substrate is kept at a relatively low temperature. It is a one-stage process, no furnace is required and therefore, in principle, there is no size limit on the substrate [4][5][6][7][8]. In addition, removing the need for a furnace provides the possibility of on-site enamelling and repair.…”

Section: Introductionmentioning

confidence: 99%

Microporosity and delamination mechanisms in thermally sprayed borosilicate glass coatings

Gao

Bao

Gawne

2016

Surface and Coatings Technology

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Conventional enamelling requires both the feedstock powder and the substrate component to be heated one or more times in a furnace at 800 -900 o C. The process can degrade the substrate and limit the size of the component to the furnace dimensions, which are serious restrictions on the technology. This study concerns the use of combustion-flame spraying as an alternative technique for enamelling. In this process, the heat source (the flame) is separated from the substrate, which enables much lower substrate temperatures and avoids thermal damage. It also removes the need for furnace treatment and opens up the possibility of on-site enamelling and repair. However, experimental trials showed that thick flame-spray coatings delaminated during cooling and had high microporosities due to quenching stresses at the glass-steel interface and inadequate splat flow of small feedstock particles. The research shows that these adverse mechanisms could be overcome by pre-heating the substrate surface to the dilatometric softening temperature and removing fines from the feedstock powder. The control of these two parameters was found to double the adhesion strength, provide coatings of very similar hardness and fracture toughness to conventional enamel as well as deposit coatings of over 1 mm in thickness for heavy-duty corrosion protection. Thermal spraying is well established for ceramic and metal coatings but the fundamentally different structure of glasses requires a different approach. An advantage of combustion flame spraying shown up by this research is that the high energy of the flame accelerates the particles to a high velocity and the resulting impact forces promote the flow of the glass. As a result, lower substrate temperatures may be used with reduced risk of degradation or higher viscosity glasses may be 3 deposited with enhanced properties. The influence of the type of thermal-spray technique on coating quality is also discussed.

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HVOF thermal sprayed coatings on aluminium alloys and aluminium matrix composites

Cited by 56 publications

References 4 publications

HVOF-sprayed WC–CoCr coatings on Al alloy: Effect of the coating thickness on the tribological properties

HVOF-sprayed WC–CoCr coatings on Al alloy: Effect of the coating thickness on the tribological properties

Friction and Wear Properties of Plasma Sprayed YSZ/Ni-Cr-Al Coated 6063-T6 Aluminum Alloy

Microporosity and delamination mechanisms in thermally sprayed borosilicate glass coatings

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