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

J. Leivo (Corresponding Author), Tommi Varis, Erja Turunen, M. Vippola, K. Rissa, Ulla Kanerva, J. Silvonen, T.A. Mäntylä

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)

Abstract

Aluminosilicate/mullite coatings were prepared from nanosized sources of aluminium and silicon by means of a high velocity oxy-fuel thermal spray process. X-ray diffraction, analytical electron microscopy, differential thermal analysis and Fourier transform infrared spectroscopy were used to characterize the phase composition, elementary distribution, and microstructure in the feedstock and in the coatings. It was revealed that the chemical environment of the alumina component, as well as the inherent elementary distribution in the nanoparticulate aluminosilicate feedstock, showed the greatest influence on the microstructure and the crystallization of nanosized ceramic phases in the sprayed coatings. A uniform distribution of alumina and silica in a short-range ordered monophasic-like nanostructure was the most appropriate physico-chemical conditions of the feedstock to achieve nanosized crystallites of mullite in a monolithic-like aluminosilicate coating. In turn, when using diphasic feedstock, clearly heterogeneous but nanostructured coatings with a good abrasion resistance were obtained. The agglomerated and heat-treated powders were considered as the most suitable type of feedstock for providing nanostructured aluminosilicate coatings.
Original languageEnglish
Pages (from-to)335-344
JournalSurface and Coatings Technology
Volume203
Issue number3-4
DOIs
Publication statusPublished - 2008
MoE publication typeA1 Journal article-refereed

Fingerprint

sprayed coatings
Sprayed coatings
Mullite
Aluminosilicates
Feedstocks
coatings
Coatings
Aluminum Oxide
Alumina
aluminum oxides
abrasion resistance
microstructure
Microstructure
Crystallites
Phase composition
Differential thermal analysis
Electron microscopy
crystallites
Wear resistance
Fourier transform infrared spectroscopy

Keywords

  • aluminosilicate
  • crystallization
  • high velocity oxy-fuel
  • HVOF
  • mullite
  • nanostructured coatings
  • thermal spraying
  • ProperPart

Cite this

Leivo, J. ; Varis, Tommi ; Turunen, Erja ; Vippola, M. ; Rissa, K. ; Kanerva, Ulla ; Silvonen, J. ; Mäntylä, T.A. / Influence of the elementary mixing scale on HVOF-sprayed coatings derived from nanostructured aluminosilicate/mullite feedstock. In: Surface and Coatings Technology. 2008 ; Vol. 203, No. 3-4. pp. 335-344.
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abstract = "Aluminosilicate/mullite coatings were prepared from nanosized sources of aluminium and silicon by means of a high velocity oxy-fuel thermal spray process. X-ray diffraction, analytical electron microscopy, differential thermal analysis and Fourier transform infrared spectroscopy were used to characterize the phase composition, elementary distribution, and microstructure in the feedstock and in the coatings. It was revealed that the chemical environment of the alumina component, as well as the inherent elementary distribution in the nanoparticulate aluminosilicate feedstock, showed the greatest influence on the microstructure and the crystallization of nanosized ceramic phases in the sprayed coatings. A uniform distribution of alumina and silica in a short-range ordered monophasic-like nanostructure was the most appropriate physico-chemical conditions of the feedstock to achieve nanosized crystallites of mullite in a monolithic-like aluminosilicate coating. In turn, when using diphasic feedstock, clearly heterogeneous but nanostructured coatings with a good abrasion resistance were obtained. The agglomerated and heat-treated powders were considered as the most suitable type of feedstock for providing nanostructured aluminosilicate coatings.",
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Influence of the elementary mixing scale on HVOF-sprayed coatings derived from nanostructured aluminosilicate/mullite feedstock. / Leivo, J. (Corresponding Author); Varis, Tommi; Turunen, Erja; Vippola, M.; Rissa, K.; Kanerva, Ulla; Silvonen, J.; Mäntylä, T.A.

In: Surface and Coatings Technology, Vol. 203, No. 3-4, 2008, p. 335-344.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Influence of the elementary mixing scale on HVOF-sprayed coatings derived from nanostructured aluminosilicate/mullite feedstock

AU - Leivo, J.

AU - Varis, Tommi

AU - Turunen, Erja

AU - Vippola, M.

AU - Rissa, K.

AU - Kanerva, Ulla

AU - Silvonen, J.

AU - Mäntylä, T.A.

PY - 2008

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N2 - Aluminosilicate/mullite coatings were prepared from nanosized sources of aluminium and silicon by means of a high velocity oxy-fuel thermal spray process. X-ray diffraction, analytical electron microscopy, differential thermal analysis and Fourier transform infrared spectroscopy were used to characterize the phase composition, elementary distribution, and microstructure in the feedstock and in the coatings. It was revealed that the chemical environment of the alumina component, as well as the inherent elementary distribution in the nanoparticulate aluminosilicate feedstock, showed the greatest influence on the microstructure and the crystallization of nanosized ceramic phases in the sprayed coatings. A uniform distribution of alumina and silica in a short-range ordered monophasic-like nanostructure was the most appropriate physico-chemical conditions of the feedstock to achieve nanosized crystallites of mullite in a monolithic-like aluminosilicate coating. In turn, when using diphasic feedstock, clearly heterogeneous but nanostructured coatings with a good abrasion resistance were obtained. The agglomerated and heat-treated powders were considered as the most suitable type of feedstock for providing nanostructured aluminosilicate coatings.

AB - Aluminosilicate/mullite coatings were prepared from nanosized sources of aluminium and silicon by means of a high velocity oxy-fuel thermal spray process. X-ray diffraction, analytical electron microscopy, differential thermal analysis and Fourier transform infrared spectroscopy were used to characterize the phase composition, elementary distribution, and microstructure in the feedstock and in the coatings. It was revealed that the chemical environment of the alumina component, as well as the inherent elementary distribution in the nanoparticulate aluminosilicate feedstock, showed the greatest influence on the microstructure and the crystallization of nanosized ceramic phases in the sprayed coatings. A uniform distribution of alumina and silica in a short-range ordered monophasic-like nanostructure was the most appropriate physico-chemical conditions of the feedstock to achieve nanosized crystallites of mullite in a monolithic-like aluminosilicate coating. In turn, when using diphasic feedstock, clearly heterogeneous but nanostructured coatings with a good abrasion resistance were obtained. The agglomerated and heat-treated powders were considered as the most suitable type of feedstock for providing nanostructured aluminosilicate coatings.

KW - aluminosilicate

KW - crystallization

KW - high velocity oxy-fuel

KW - HVOF

KW - mullite

KW - nanostructured coatings

KW - thermal spraying

KW - ProperPart

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SN - 0257-8972

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