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

Yasunobu Noritake; Hajime Kiyono; Shiro Shimada

doi:10.4028/3-908454-00-X.135

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

Yasunobu Noritake, Hajime Kiyono, Shiro Shimada

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

Mullite film was formed on β-SiAlON (Si_6-zAl _zO_zN_8-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 language	English
Pages (from-to)	135-138
Number of pages	4
Journal	Key Engineering Materials
Volume	403
DOIs	https://doi.org/10.4028/3-908454-00-X.135
Publication status	Published - 2009 Feb 2
Externally published	Yes

Keywords

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

ASJC Scopus subject areas

Materials Science(all)
Mechanics of Materials
Mechanical Engineering

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10.4028/3-908454-00-X.135

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title = "Preparation and corrosion of mullite thin film on β-sialon ceramics",

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.",

keywords = "AlO coating, Corrosion resistance to water vapor, Dipping method, Mullite, β-sialon",

author = "Yasunobu Noritake and Hajime Kiyono and Shiro Shimada",

year = "2009",

month = feb,

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doi = "10.4028/3-908454-00-X.135",

language = "English",

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T1 - Preparation and corrosion of mullite thin film on β-sialon ceramics

AU - Noritake, Yasunobu

AU - Kiyono, Hajime

AU - Shimada, Shiro

PY - 2009/2/2

Y1 - 2009/2/2

N2 - 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.

AB - 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.

KW - AlO coating

KW - Corrosion resistance to water vapor

KW - Dipping method

KW - Mullite

KW - β-sialon

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JO - Key Engineering Materials

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

Abstract

Keywords

ASJC Scopus subject areas

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