Details
| Original language | English |
|---|---|
| Pages (from-to) | 1743-1748 |
| Number of pages | 6 |
| Journal | Journal of the European Ceramic Society |
| Volume | 25 |
| Issue number | 10 SPEC. ISS. |
| Publication status | Published - 2005 |
Abstract
The oxidation in air of Si3N4-based ceramics containing 35 vol.% of TiN secondary phase and different amounts of sintering additives has been studied at different temperatures up to 1400 °C in dry or humid environment. The oxidation starts by crystal growth of TiO2 at the surface, then a multilayered scale develops under the rutile layer from 1000 °C. This subscale is composed of silicon nitride in which TiN particles are oxidized to agglomerates of rutile, glass and pores. The oxidation process is controlled by the matter transports, which take place in the intergranular phase. These transport phenomena are affected by the changes in distribution and composition of the glassy phase and by humidity which modifies the glass network structure and thus the in-diffusion rate. From 1200 °C, Si3N4 grains are also oxidized, the additional glass formed closes the residual porosities yielding scales more compact and developing an autoprotective behavior. At 1400 °C, glass phase crystallizes into cristobalite and the rutile top layer becomes discontinuous. Only composites with low amounts of sinter additives keep an autoprotective oxidation mode.
Keywords
- Composites, Diffusion, Electron microscopy, Oxidation, SiN
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. 1743-1748.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Oxidation behaviour of Si3N4-TiN ceramics under dry and humid air at high temperature
AU - Mazerolles, Leo
AU - Feldhoff, Armin
AU - Trichet, Marie France
AU - Backhaus-Ricoult, Monika
N1 - Funding Information: The composite materials were provided by Dr. Alida Bellosi (ISTEC-CNR, Faenza, Italy) and Prof. Martine Desmaison-Brut (University of Limoges, France). The authors greatly acknowledge the support of the European Community in the frame of the European Network Project—Corrosion of ceramic matrix composites—HPRN-CT-2000-00044.
PY - 2005
Y1 - 2005
N2 - The oxidation in air of Si3N4-based ceramics containing 35 vol.% of TiN secondary phase and different amounts of sintering additives has been studied at different temperatures up to 1400 °C in dry or humid environment. The oxidation starts by crystal growth of TiO2 at the surface, then a multilayered scale develops under the rutile layer from 1000 °C. This subscale is composed of silicon nitride in which TiN particles are oxidized to agglomerates of rutile, glass and pores. The oxidation process is controlled by the matter transports, which take place in the intergranular phase. These transport phenomena are affected by the changes in distribution and composition of the glassy phase and by humidity which modifies the glass network structure and thus the in-diffusion rate. From 1200 °C, Si3N4 grains are also oxidized, the additional glass formed closes the residual porosities yielding scales more compact and developing an autoprotective behavior. At 1400 °C, glass phase crystallizes into cristobalite and the rutile top layer becomes discontinuous. Only composites with low amounts of sinter additives keep an autoprotective oxidation mode.
AB - The oxidation in air of Si3N4-based ceramics containing 35 vol.% of TiN secondary phase and different amounts of sintering additives has been studied at different temperatures up to 1400 °C in dry or humid environment. The oxidation starts by crystal growth of TiO2 at the surface, then a multilayered scale develops under the rutile layer from 1000 °C. This subscale is composed of silicon nitride in which TiN particles are oxidized to agglomerates of rutile, glass and pores. The oxidation process is controlled by the matter transports, which take place in the intergranular phase. These transport phenomena are affected by the changes in distribution and composition of the glassy phase and by humidity which modifies the glass network structure and thus the in-diffusion rate. From 1200 °C, Si3N4 grains are also oxidized, the additional glass formed closes the residual porosities yielding scales more compact and developing an autoprotective behavior. At 1400 °C, glass phase crystallizes into cristobalite and the rutile top layer becomes discontinuous. Only composites with low amounts of sinter additives keep an autoprotective oxidation mode.
KW - Composites
KW - Diffusion
KW - Electron microscopy
KW - Oxidation
KW - SiN
UR - http://www.scopus.com/inward/record.url?scp=18144401958&partnerID=8YFLogxK
U2 - 10.1016/j.jeurceramsoc.2004.12.016
DO - 10.1016/j.jeurceramsoc.2004.12.016
M3 - Article
AN - SCOPUS:18144401958
VL - 25
SP - 1743
EP - 1748
JO - Journal of the European Ceramic Society
JF - Journal of the European Ceramic Society
SN - 0955-2219
IS - 10 SPEC. ISS.
ER -