Investigations on surface reactivity of silicon-carbonitride powders by thermoanalytical methods

Breuning, T.; Neumann, Anika; Boden, G.

doi:10.1016/s0167-2738(97)00185-9

Cited by 3 publications

(2 citation statements)

References 5 publications

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“…One reason for the high affinity of isocyanate to the particle surface could be their ability of forming covalent bindings with the surface hydroxyl and amino groups. 24 Hydrophobicity of the coated particles, which was estimated by the adsorption of water vapor, correlated well with their resistance against oxidation. Coatings of the molecules, which were well-soluble or showed high adsorption affinity, resulted in low water uptake of the powder.…”

Section: Discussionmentioning

confidence: 77%

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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: Discussionmentioning

confidence: 77%

“…The builtup multilayer seems to be defectless, which was demonstrated by the good protection of the isocyanate-coated powder during the heating in an air atmosphere. One reason for the high affinity of isocyanate to the particle surface could be their ability of forming covalent bindings with the surface hydroxyl and amino groups …”

Section: Discussionmentioning

confidence: 99%