Details
| Original language | English |
|---|---|
| Pages (from-to) | 1733-1742 |
| Number of pages | 10 |
| Journal | Journal of the European Ceramic Society |
| Volume | 25 |
| Issue number | 10 SPEC. ISS. |
| Publication status | Published - 2005 |
Abstract
The high-temperature oxidation of Si3N4-TiN particulate composites with different amounts of the glass forming sinter additives Al2O3 and Y2 O3 has been studied in order to reveal the oxidation mechanism with its different reaction steps and kinetics and especially identify the role of the glass phase in the course of oxidation. The initial stages of oxidation have been observed in situ in an environmental scanning electron microscope while exposing the materials to dry or humid oxidation environment at temperatures between 600 and 1100 °C. For the characterization of the later oxidation stages, materials were oxidized ex situ for longer times. The oxidation scales were characterized by X-ray diffraction, field emission scanning electron microscopy and transmission electron microscopy. Oxidation of the compo sites starts at 650 °C, when TiN surface particles begin to oxidize and form on their exposed surface islands of nanocrystalline TiO2. At around 950 °C, the glass transition temperature of the intergranular glass phase, these nanocrystals start to grow laterally on the surface. At the same time, oxidation progresses into the depth of the material, forming thereby several distinguished oxidation subscales. The intergranular glass plays a crucial role for the oxidation in the temperature range between 950 and 1100 °C. Depending on the glass quantity in presence, different reaction mechanisms dominate; the oxidation kinetics are strongly controlled by the transport within the intergranular glass.
Keywords
- Composites, Corrosion, Electron microscopy, SiN, TiN
ASJC Scopus subject areas
- Materials Science(all)
- Ceramics and Composites
- Materials Science(all)
- Materials Chemistry
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In: Journal of the European Ceramic Society, Vol. 25, No. 10 SPEC. ISS., 2005, p. 1733-1742.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Electron microscopy study on the high-temperature oxidation of Si3N4-TiN ceramics
T2 - In situ and ex situ investigations
AU - Feldhoff, Armin
AU - Trichet, Marie France
AU - Mazerolles, Leo
AU - Backhaus-Ricoult, Monika
N1 - Funding Information: A part of this work was supported by the European Commission under contract number HPRN-CT-2000-00044. Composite materials were provided by Professor Martine Desmaison-Brut (University of Limoges, France) and Dr. Alida Bellosi (ISTEC-CNR, Faenza, Italy). The authors are grateful to John Hunt (Cornell Center for Materials Research, Ithaca, NY, USA) for support in ESEM-3 experiments.
PY - 2005
Y1 - 2005
N2 - The high-temperature oxidation of Si3N4-TiN particulate composites with different amounts of the glass forming sinter additives Al2O3 and Y2 O3 has been studied in order to reveal the oxidation mechanism with its different reaction steps and kinetics and especially identify the role of the glass phase in the course of oxidation. The initial stages of oxidation have been observed in situ in an environmental scanning electron microscope while exposing the materials to dry or humid oxidation environment at temperatures between 600 and 1100 °C. For the characterization of the later oxidation stages, materials were oxidized ex situ for longer times. The oxidation scales were characterized by X-ray diffraction, field emission scanning electron microscopy and transmission electron microscopy. Oxidation of the compo sites starts at 650 °C, when TiN surface particles begin to oxidize and form on their exposed surface islands of nanocrystalline TiO2. At around 950 °C, the glass transition temperature of the intergranular glass phase, these nanocrystals start to grow laterally on the surface. At the same time, oxidation progresses into the depth of the material, forming thereby several distinguished oxidation subscales. The intergranular glass plays a crucial role for the oxidation in the temperature range between 950 and 1100 °C. Depending on the glass quantity in presence, different reaction mechanisms dominate; the oxidation kinetics are strongly controlled by the transport within the intergranular glass.
AB - The high-temperature oxidation of Si3N4-TiN particulate composites with different amounts of the glass forming sinter additives Al2O3 and Y2 O3 has been studied in order to reveal the oxidation mechanism with its different reaction steps and kinetics and especially identify the role of the glass phase in the course of oxidation. The initial stages of oxidation have been observed in situ in an environmental scanning electron microscope while exposing the materials to dry or humid oxidation environment at temperatures between 600 and 1100 °C. For the characterization of the later oxidation stages, materials were oxidized ex situ for longer times. The oxidation scales were characterized by X-ray diffraction, field emission scanning electron microscopy and transmission electron microscopy. Oxidation of the compo sites starts at 650 °C, when TiN surface particles begin to oxidize and form on their exposed surface islands of nanocrystalline TiO2. At around 950 °C, the glass transition temperature of the intergranular glass phase, these nanocrystals start to grow laterally on the surface. At the same time, oxidation progresses into the depth of the material, forming thereby several distinguished oxidation subscales. The intergranular glass plays a crucial role for the oxidation in the temperature range between 950 and 1100 °C. Depending on the glass quantity in presence, different reaction mechanisms dominate; the oxidation kinetics are strongly controlled by the transport within the intergranular glass.
KW - Composites
KW - Corrosion
KW - Electron microscopy
KW - SiN
KW - TiN
UR - http://www.scopus.com/inward/record.url?scp=18144385764&partnerID=8YFLogxK
U2 - 10.1016/j.jeurceramsoc.2004.12.003
DO - 10.1016/j.jeurceramsoc.2004.12.003
M3 - Article
AN - SCOPUS:18144385764
VL - 25
SP - 1733
EP - 1742
JO - Journal of the European Ceramic Society
JF - Journal of the European Ceramic Society
SN - 0955-2219
IS - 10 SPEC. ISS.
ER -