Chromium catalysed silicon nitridation

Cofer, Cameron G.; Lewis, Jennifer A.

doi:10.1007/bf00366871

Cited by 17 publications

(20 citation statements)

References 13 publications

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“…In a number of studies, the inclusion of low levels of transition metal ion dopant has been shown to facilitate the nitridation of another phase. For example, chromium catalysed silicon nitridation has been demonstrated [31]. However, to our knowledge, the effect of Fe dopant on the molybdenum phase appears to have been little studied, although iron may be anticipated to have a promotional effect.…”

Section: Resultsmentioning

confidence: 96%

Nitridation of MoO3/HZSM-5 and Fe-MoO3/HZSM-5

et al. 2009

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Thermal treatment and subsequent ammonolysis of MoO 3 /H-ZSM-5 is shown to be an effective means for the preparation of zeolite dispersed nitrided molybdenum species. However, it is unlikely that these species reflect the bulk structures formed by analogous treatment of bulk MoO 3 precursor. The inclusion of low levels of Fe as a dopant does not produce any apparent effects on the Mo XPS spectra, although the amount of N incorporation is increased, and iron is shown to be reduced to Fe 0 . FTIR studies evidence the migration of molybdenum oxo species into the zeolite at the temperatures employed.

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Section: Resultsmentioning

confidence: 96%

Nitridation of MoO3/HZSM-5 and Fe-MoO3/HZSM-5

et al. 2009

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“…Mitomo et al 8) reported that the α/β ratio of a nitrided RBSN with FeO added was higher than that observed for pure silicon. Many researchers 9), 13) have reported the α/β ratio of nitrided RBSN with various added …”

Section: Resultsmentioning

confidence: 99%

Influence of zirconia addition on reaction bonded silicon nitride produced from various silicon particle sizes

Hyuga

Yoshida

Kondo

et al. 2008

J. Ceram. Soc. Japan

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Reaction bonded silicon nitride ceramics have been produced from Si powders of different particle size and both with and without zirconia as a nitride catalyzing element. The effect of the ZrO2 on the nitridation rate of the specimens was studied as a function of temperature, and the mechanism of enhanced nitridation was discussed. At all temperatures, the degree of nitridation of specimens sintered with ZrO2 was higher than those without additions for all particle sizes. In the case of nitridation of specimens produced without ZrO2, the degree of nitridation was dependent on particle size, with larger sizes resulting in less nitridation. For specimens with ZrO2 the finest powder also showed highest transformation, but there was no difference in the degree of nitridation of medium and coarse powders. It was found that during heating of the specimens the ZrO2 was transformed to ZrN at low temperature and enhanced nitridation is considered to be due to this phase re-converting to ZrO2 at higher temperature and thereby supplying nitrogen to the interior of the specimens. At lower temperatures, the strength of the specimens with ZrO2 were higher than those without, attributed to the enhanced nitridation. However, comparing strengths of fully nitrided specimens, those with ZrO2 were lower than those without, thought to be due to the presence of ZrO2 particles disrupting the connectivity of adjacent silicon nitride grains.

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“…This distinct effect is caused by the reaction between N 2 and Si, which is, in contrast to MoSi 2 , efficiently catalyzed by additional constituents of the FeSiCr. [13][14][15] The formation of Si 3 N 4 and Si-O-N phases due to this reaction resulted in a dense material without further shrinkage. [1][2][3][4][5] …”

Section: Sample Preparation and Characterizationmentioning

confidence: 99%

“…In contrast, the Si 3 N 4 and Si 2 N 2 O formation in the material system with FeSiCr is catalyzed through constituents of the filler. [13][14][15] Samples with FeSiCr-contents < 10 vol.% show, as in the MoSi 2 -system, no adequate densification during the thermal treatment. Samples containing 10 vol.% FeSiCr have mechanical properties slightly lower than those of the MoSi 2 -system after a pyrolysis at 1450°C for 3 h in 5 MPa N 2 .…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Polymer‐Derived Ceramics for Advanced Bearing Applications

Steinau

Travitzky²,

Gegner

et al. 2008

Adv Eng Mater

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Linear sliding and roller bearings are widely used in various industries like the food/pharma or semiconductor sector. Ceramic bearings, however, are still a niche product only, due to their high production costs. Polymer‐derived ceramics, made out of polysiloxanes and inorganic fillers like MoSi2, FeSiCr, SiC and Al2O3 offer the opportunity for a cost efficient production of ceramic bearing components, using injection molding techniques.

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Chromium catalysed silicon nitridation

Cited by 17 publications

References 13 publications

Nitridation of MoO3/HZSM-5 and Fe-MoO3/HZSM-5

Nitridation of MoO3/HZSM-5 and Fe-MoO3/HZSM-5

Influence of zirconia addition on reaction bonded silicon nitride produced from various silicon particle sizes

Polymer‐Derived Ceramics for Advanced Bearing Applications

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