High temperature oxidation of sintered TiC in an H2O-containing atmosphere

A. Onuma, Hajime Kiyono, S. Shimada, M. Desmaison

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Isothermal oxidation of sintered titanium carbide (TiC) ceramics produced by HIP processing was carried out at temperatures of 900 to 1200 °C for 1 to 50 h in O2/Ar (dry oxidation), O2/H2O/Ar (wet oxidation) and H2O/Ar (H2O oxidation) with oxygen and water partial pressures (PO2 and PH2O) of 5 kPa. The oxidation kinetics were described by a diffusion-limited rate equation in dry atmospheres and by an interfacial reaction-limited rate equation, following an early stage diffusion-limited reaction in wet and H2O atmospheres. Some inflection points were observed on the isothermal oxidation curves due to the formation of cracks, as observed by SEM. The oxidation rates at 900 °C in dry and wet atmospheres were not greatly changed, but slightly accelerated in H2O. At 1000 °C, the oxidation rates became higher in the order of H2O>wet>dry atmosphere. Above 1100 °C, the oxidation rates were almost the same as in wet and H2O atmospheres, but higher than in the dry condition. X-ray diffraction (XRD) analysis showed that the oxide scale obtained under all conditions consisted of TiO 2.

Original languageEnglish
Pages (from-to)417-419
Number of pages3
JournalSolid State Ionics
Volume172
Issue number1-4 SPEC. ISS.
DOIs
Publication statusPublished - 2004 Aug 31
Externally publishedYes

Fingerprint

Sintered carbides
titanium carbides
Titanium carbide
Thermooxidation
atmospheres
Oxidation
oxidation
titanium carbide
hot isostatic pressing
inflection points
water pressure
Hot isostatic pressing
Surface chemistry
Partial pressure
Oxides
X ray diffraction analysis
partial pressure
cracks
ceramics
Oxygen

Keywords

  • Dry and wet oxidation
  • HO
  • Kinetics
  • Microstructure
  • Titanium carbide

ASJC Scopus subject areas

  • Electrochemistry
  • Physical and Theoretical Chemistry
  • Energy Engineering and Power Technology
  • Materials Chemistry
  • Condensed Matter Physics

Cite this

High temperature oxidation of sintered TiC in an H2O-containing atmosphere. / Onuma, A.; Kiyono, Hajime; Shimada, S.; Desmaison, M.

In: Solid State Ionics, Vol. 172, No. 1-4 SPEC. ISS., 31.08.2004, p. 417-419.

Research output: Contribution to journalArticle

Onuma, A. ; Kiyono, Hajime ; Shimada, S. ; Desmaison, M. / High temperature oxidation of sintered TiC in an H2O-containing atmosphere. In: Solid State Ionics. 2004 ; Vol. 172, No. 1-4 SPEC. ISS. pp. 417-419.
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