Influence of the elementary mixing scale on HVOF-sprayed coatings derived from nanostructured aluminosilicate/mullite feedstock

Leivo, Jarkko; Varis, Tommi; Turunen, Erja; Vippola, Minnamari; Rissa, Kati; Kanerva, Ulla; Silvonen, J.; Mäntylä, T.

doi:10.1016/j.surfcoat.2008.09.008

Cited by 3 publications

(3 citation statements)

References 47 publications

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“…2(a)). The structure of this coating is bimodal, similar to another publication [15]-besides the mentioned nanostructural particles, the rest of the coating exhibits a microstructure with splats built from completely resolidified TiO 2 . This feature is not observed in any other coatings in our set of experiments.…”

Section: Resultssupporting

confidence: 77%

“…The inverse wear rate values have the same trend as microhadrdness. In fact, HVOF spraying of ceramics needs relatively sophisticated optimization [15] to get perfect melting of the powders and building of the coating with this low-temperature process leading to good mechanical properties. Plasma spraying offers better melting of the ceramic powder particles (indicated by low roughness), resulting in good inter-splat contact in the coatings.…”

Section: Resultsmentioning

confidence: 99%

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Structural and photocatalytic characteristics of TiO2 coatings produced by various thermal spray techniques

Ctibor¹,

Štengl²,

Pala³

2013

J Adv Ceram

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Titanium dioxide (TiO 2 ) was elaborated by four different thermal spray techniques-(i) plasma spraying using a water-stabilized torch, (ii) plasma spraying using a gas-stabilized torch, (iii) high velocity oxy-fuel gun, and (iv) oxy-acetylene flame. The porosity of the coatings was studied by optical microscopy, nano-structural features by scanning electron microscopy (SEM), phase composition by X-ray diffraction (XRD); the microhardness, surface roughness and wear resistance were evaluated. The diffuse reflectance was measured by ultra-violet/visible/near-infrared (UV/Vis/NIR) scanning spectrophotometer. The kinetics of photocatalytic degradation of gaseous acetone was measured under a UV lamp with 365 nm wavelength. After all the applied spray processes, the transformation of anatase phase from the initial powders to rutile phase in the coatings occurred. In spite of this transformation, all the coatings exhibited certain photocatalytic activity, which correlated well with their band gap energy calculated from reflectivity. All the coatings offer relatively good mechanical properties and can serve as robust photocatalysts.

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Section: Resultssupporting

confidence: 77%

Section: Resultsmentioning

confidence: 99%

Structural and photocatalytic characteristics of TiO2 coatings produced by various thermal spray techniques

Ctibor¹,

Štengl²,

Pala³

2013

J Adv Ceram

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“…Free SiO 2 is not detectable in as-sprayed coating, because it is present in a glassy state. In a recent work, completely amorphous silica-rich mullite coatings were fabricated by HVOF (high velocity oxygen fuel) spraying, starting from fused and crushed feedstock characterized by an angular morphology [16].…”

Section: Resultsmentioning

confidence: 99%

Microstructural and thermal properties of plasma sprayed mullite coatings

Girolamo

Blasi

Pilloni

et al. 2010

Ceramics International

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Functionally Graded Material Coatings (FGMC) – A Review

Ranjan¹,

Kumar

Walia

2021

J. Phys.: Conf. Ser.

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The coatings are substances that are applied over the surface of an object to prevent it from wear, tarnish and corrosion. Coatings maintain the properties of base metals (thermal, optical and electrical) over a long duration of time. The coatings are generally characterized by the properties like good adhesion, low porosity and substrate compatibility that include geometry and temperature. Coatings often suffer from problems like variable thermal expansion coefficient compared to their base metals. To overcome the variable thermal expansion issue, the functionally graded material (FGM) layers may be imposed. Present work aims to study the FGM coatings capable of enhancing the mechanical, thermal and tribological properties of base metals by providing scratch resistance. An attempt has been made to present a comprehensive review of high-velocity-oxy-fuel, plasma spray and other techniques adopted by industries and other groups. The effects of applying FGM coatings on the operating conditions and the performance of the base metals are also covered in detail.

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Influence of the elementary mixing scale on HVOF-sprayed coatings derived from nanostructured aluminosilicate/mullite feedstock

Cited by 3 publications

References 47 publications

Structural and photocatalytic characteristics of TiO2 coatings produced by various thermal spray techniques

Structural and photocatalytic characteristics of TiO2 coatings produced by various thermal spray techniques

Microstructural and thermal properties of plasma sprayed mullite coatings

Functionally Graded Material Coatings (FGMC) – A Review

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