Electron microscopy study on the high-temperature oxidation of Si3N4–TiN ceramics: in situ and ex situ investigations

Feldhoff, Armin; Trichet, M.-F.; Mazérolles, L.; Backhaus‐Ricoult, M.

doi:10.1016/j.jeurceramsoc.2004.12.003

Cited by 10 publications

(5 citation statements)

References 17 publications

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“…2a). Obviously, the individual nanocrystals show some internal porosity what is seen by speckle-like bright features in Fig 38. It is argued that rutile generally has a tendency to form voids of this particular shape.…”

Section: Morphology Of the Powder Particlesmentioning

confidence: 85%

“…Concerning the voids and their particular shape, it should be mentioned that similar void features have been observed in micrometer-sized rutile grains grown in oxidation scales of Si 3 N 4 -TiN composite ceramics 37 in context with ref. 38. It is argued that rutile generally has a tendency to form voids of this particular shape.…”

Section: Morphology Of the Powder Particlesmentioning

confidence: 99%

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Adsorption of oxalate on rutile particles in aqueous solutions: a spectroscopic, electron-microscopic and theoretical study

Mendive

Bredow

Feldhoff

et al. 2008

Phys. Chem. Chem. Phys.

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The adsorption of oxalic acid from the aqueous phase at the surface of rutile nanoparticles has been investigated by attenuated total-reflection Fourier-transformed infrared (ATR-FTIR) measurements. A combination of high resolution transmission electron microscopy (HRTEM) and Wulff-type construction was used to elucidate the typical morphology of the nanocrystals. It is estimated that (110)-type facets present more than 85% of the exposed surface in the powder. The aqueous system was also studied quantum-chemically using the semiempirical method MSINDO. Geometry optimizations have been performed, and the vibration spectra of the most stable surface complexes have been calculated. A sequence of model types has been applied in the quantum-chemical calculations in order to take into account the effect of interaction of water and oxalic acid on the adsorption mechanism and the vibration spectra. It was found that the presence of the aqueous phase significantly changes the stability of the oxalic acid surface complexes compared with the bare TiO(2) surface. The combination of experimental and theoretical information allowed identification of three species as the main contributors to the surface speciation. Two bidentate species were found with the C-C bond parallel to the TiO(2) surface, one monoprotonated and one deprotonated, and a third species being monodentate and monoprotonated.

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Section: Morphology Of the Powder Particlesmentioning

confidence: 85%

Section: Morphology Of the Powder Particlesmentioning

confidence: 99%

Adsorption of oxalate on rutile particles in aqueous solutions: a spectroscopic, electron-microscopic and theoretical study

Mendive

Bredow

Feldhoff

et al. 2008

Phys. Chem. Chem. Phys.

Self Cite

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“…7, the micro-asperities (flash) temperature, which was coincident with the bulk temperature, reached about 500 • C during our tests. This temperature is well below the oxidation temperature for silicon nitride [23] but sufficient to trig oxidation in SiC ceramics [24]. However, for the calculation of the temperature profiles, the contact area was considered as the elastic contact area derived from Hertzian theory.…”

Section: Wear Ratesmentioning

confidence: 99%

Dry sliding wear behavior of nano-sized SiC pins against SiC and Si3N4 discs

Guicciardi

Sciti

Melandri

et al. 2007

Wear

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“…Another factor with a great role in the oxidation of Si 3 N 4 -TiN composites is the intergranular phase present in the grain boundary. For Feldhoff et al 18 this process is strongly dependent on the glass transition temperature of the intergranular glass since this phase affects the species dissolution and diffusional transport. According to Bracisiewicz et al 17 and Bellosi et al 19 , sintering aid cations in the intergranular phase tend to diffuse from the bulk to the reaction interface, forming glassy silicates and other oxidation products.…”

Section: Introductionmentioning

confidence: 99%

Oxidation behavior of Si3N4-TiN composites at 1400 oC

Ferreira,

Carvalho,

Guedes-Silva

2023

Mat. Res.

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In this paper, the oxidation behavior of silicon nitride with different contents of TiN was evaluated at 1400 o C for 64 hours in air. The oxidized samples were characterized by X-ray diffraction, scanning electron microscopy and energy dispersive X-ray spectroscopy. Weight gain measurements have shown that the oxidation followed a multiple-law model with linear, parabolic, and logarithmic contributions. The samples presented high weight gain at the beginning of the process followed by the formation of an amorphous silica surface layer containing Y 2 Ti 2 O 7 and rutile crystals. Cracks and holes were detected on the oxide layer. The oxidation resistance of the composites was strongly influenced by the initial content of TiN.

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Electron microscopy study on the high-temperature oxidation of Si3N4–TiN ceramics: in situ and ex situ investigations

Cited by 10 publications

References 17 publications

Adsorption of oxalate on rutile particles in aqueous solutions: a spectroscopic, electron-microscopic and theoretical study

Adsorption of oxalate on rutile particles in aqueous solutions: a spectroscopic, electron-microscopic and theoretical study

Dry sliding wear behavior of nano-sized SiC pins against SiC and Si3N4 discs

Oxidation behavior of Si3N4-TiN composites at 1400 oC

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