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 language | English |
|---|---|
| Pages (from-to) | 417-419 |
| Number of pages | 3 |
| Journal | Solid State Ionics |
| Volume | 172 |
| Issue number | 1-4 SPEC. ISS. |
| DOIs | |
| Publication status | Published - 2004 Aug 31 |
| Externally published | Yes |
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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 journal › Article
}
TY - JOUR
T1 - High temperature oxidation of sintered TiC in an H2O-containing atmosphere
AU - Onuma, A.
AU - Kiyono, Hajime
AU - Shimada, S.
AU - Desmaison, M.
PY - 2004/8/31
Y1 - 2004/8/31
N2 - 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.
AB - 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.
KW - Dry and wet oxidation
KW - HO
KW - Kinetics
KW - Microstructure
KW - Titanium carbide
UR - http://www.scopus.com/inward/record.url?scp=7544237556&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=7544237556&partnerID=8YFLogxK
U2 - 10.1016/j.ssi.2004.02.067
DO - 10.1016/j.ssi.2004.02.067
M3 - Article
AN - SCOPUS:7544237556
VL - 172
SP - 417
EP - 419
JO - Solid State Ionics
JF - Solid State Ionics
SN - 0167-2738
IS - 1-4 SPEC. ISS.
ER -