Preparation and corrosion of mullite thin film on β-sialon ceramics

Yasunobu Noritake, Hajime Kiyono, Shiro Shimada

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Mullite film was formed on β-SiAlON (Si6-zAl zOzN8-z, z = 3) ceramics by reaction of Al 2O3 films with silica formed on oxidation to improve a high temperature water vapor corrosion resistance. Sintered β-SiAlON was fabricated by hot pressing of β-sialon (z = 3) powder without additive at 1900°C and at 24 MPa for 4 h in N2. The Al2O 3 film was deposited on polished β-SiAlON ceramics by a dip coating process of Al2O3 precursor sols prepared from the alkoxide solution and aluminum sol. The Al2O3 coated sample was heated in Ar/O2 (95/5 vol.%) at 1300°C for 2 h, resulting in the formation of mullite by reaction with silica produced from sialon. The resulting mullite-coated sample was corroded in H 2O/Ar/O2 (90/8/2 vol.%) at 1200°C for 2-100 h. The corroded samples were characterized by XRD and SEM-EDS for the evaluation of the corrosion resistance of mullite-coated sialon.

Original languageEnglish
Pages (from-to)135-138
Number of pages4
JournalKey Engineering Materials
Volume403
DOIs
Publication statusPublished - 2009
Externally publishedYes

Fingerprint

Mullite
Corrosion
Thin films
Polymethyl Methacrylate
Sols
Silicon Dioxide
Corrosion resistance
Silica
Steam
Hot pressing
Aluminum
Powders
Water vapor
Energy dispersive spectroscopy
Coatings
Oxidation
Scanning electron microscopy
aluminosilicate
Temperature

Keywords

  • β-sialon
  • AlO coating
  • Corrosion resistance to water vapor
  • Dipping method
  • Mullite

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Preparation and corrosion of mullite thin film on β-sialon ceramics. / Noritake, Yasunobu; Kiyono, Hajime; Shimada, Shiro.

In: Key Engineering Materials, Vol. 403, 2009, p. 135-138.

Research output: Contribution to journalArticle

Noritake, Yasunobu ; Kiyono, Hajime ; Shimada, Shiro. / Preparation and corrosion of mullite thin film on β-sialon ceramics. In: Key Engineering Materials. 2009 ; Vol. 403. pp. 135-138.
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