Nanosized SiCN-powders by polysilazane pyrolysis and thereof

Boden, G.; Neumann, Anika; Breuning, T.; Tschernikova, E.; Hermel, W.

doi:10.1016/s0955-2219(98)00015-6

Cited by 14 publications

(4 citation statements)

References 28 publications

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“…Nanoscaled particles of TiN were obtained from H.C. Starck (Laufenburg, Germany). Silicon carbonitride (SiCN) was synthesized via a two-step process . In the first step, volatile polysilazanes were prepared by ammonolysis of dimethyldichlorosilane in an organic aprotic solvent.…”

Section: Methodsmentioning

confidence: 99%

Protecting Nanoscaled Non-oxidic Particles from Oxygen Uptake by Coating with Nitrogen-Containing Surfactants

et al. 2004

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To suppress the reactivity of nanoscaled non-oxidic powders of titanium nitride (TiN) and silicon carbonitride (SiCN) against hydrolysis and oxidation, chemical surface modification with nitrogen-containing surfactants was investigated. Among these surfactants, long-chain primary amines, ethylenediamines, guanidines, nitriles, isocyanates, and succinimides were examined. Thermogravimetry, elemental analysis, and behavior against the water-vapor adsorption of the modified particles were used as methods to estimate the protective capacity of the organic coating material. The best results were obtained by using the long-chain amines and octadecylisocyanate, which were indicated by a significant shift of the powder oxidation toward the higher temperatures and an increase of the particle hydrophobicity. A long-chain succinimide was found to be the most effective in dispersing nanoscaled TiN in organic media. Preparation of a stable aqueous dispersion without significant changes in the elemental composition of the powder was achieved by the application of an ionic surfactant to the surface-modified particles.

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Section: Methodsmentioning

confidence: 99%

Protecting Nanoscaled Non-oxidic Particles from Oxygen Uptake by Coating with Nitrogen-Containing Surfactants

et al. 2004

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“…A SiC tûkristályokkal erõsített, Al 2 O 3 - Si-C-N Önfenntartó égés Karbid-nitrid kompozit por [15] Si-C-N Gázfázisú pirolízis Amorf SiC, Si 3 N 4 (100 nm) [16] alapú fémmegmunkáló szerszámokkal a hagyományos, keményfémalapú forgácsolószerszámokhoz képest nagyobb megmunkálási sebességgel, és a kerámia szerszá-mok hosszabb élettartamából adódóan, nagyobb termelé-kenységgel forgácsolhatók a gázturbinák gyártására felhasznált nikkel-szuperötvözetek. Néhány ilyen forgá-csolószerszám és azok mikroszerkezetét bemutató pásztá-zó elektronmikroszkópos felvétel látható a 8. ábrán.…”

Section: A Társított Kerámiák Felhasználási Lehetõségeiunclassified

Joined ceramics, alias ceramic composites

Szépvölgyi¹

2004

Epitoanyag - JSBCM

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“…While amorphous Si-C-N produced by the pyrolysis of polysilazane at a temperature <1200 • C in inert atmosphere is made up of a single Si x C y N z phase and free carbon, the crystalline state pyrolyzed beyond ~1350 • C comprises of SiC, Si 3 N 4 and C nanocomposite phases (C is free carbon; also called sp 2 hybridized carbon, turbostratic carbon or graphitic carbon) [10][11][12]. The amorphous phase is associated with very low electrical conductivity (σ dc ), in the range of 10 −9 to 10 −2 S/cm, but a vast increase of several orders of magnitude is observed as the material transforms to crystalline state via increase in pyrolysis temperature [13,14].…”

Section: Introductionmentioning

confidence: 99%

Structure and Electrical Properties of Carbon-Rich Polymer Derived Silicon Carbonitride (SiCN)

et al. 2022

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This article reports on the structure and electronic properties of carbon-rich polysilazane polymer-derived silicon carbonitride (C/SiCN) corresponding to pyrolysis temperatures between 1100 and 1600 °C in an argon atmosphere. Raman spectroscopy, X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX), Scanning Electron Microscopy (SEM) and Hall measurements were used to support the structural and electronic properties characterization of the prepared C/SiCN nanocomposites. A structural analysis using Raman spectroscopy showed the evolution of sp2 hybridized carbon phase that resulted from the growth in the lateral crystallite size (La), average continuous graphene length including tortuosity (Leq) and inter-defects distance (LD) with an increase in pyrolysis temperature. The prepared C/SiCN monoliths showed a record high room temperature (RT) electrical conductivity of 9.6 S/cm for the sample prepared at 1600 °C. The electronic properties of the nanocomposites determined using Hall measurement revealed an anomalous change in the predominant charge carriers from n-type in the samples pyrolyzed at 1100 °C to predominantly p-type in the samples prepared at 1400 and 1600 °C. According to this outcome, tailor-made carbon-rich SiCN polymer-derived ceramics could be developed to produce n-type and p-type semiconductors for development of the next generation of electronic systems for applications in extreme temperature environments.

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Nanosized SiCN-powders by polysilazane pyrolysis and thereof

Cited by 14 publications

References 28 publications

Protecting Nanoscaled Non-oxidic Particles from Oxygen Uptake by Coating with Nitrogen-Containing Surfactants

Protecting Nanoscaled Non-oxidic Particles from Oxygen Uptake by Coating with Nitrogen-Containing Surfactants

Joined ceramics, alias ceramic composites

Structure and Electrical Properties of Carbon-Rich Polymer Derived Silicon Carbonitride (SiCN)

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