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Dissolution and deagglomeration of silicon nitride in aqueous medium
YKI – Ytkemiska institutet.
YKI – Ytkemiska institutet.
YKI – Ytkemiska institutet.
2000 (engelsk)Inngår i: Journal of The American Ceramic Society, ISSN 0002-7820, E-ISSN 1551-2916, Vol. 83, s. 2394-2400Artikkel i tidsskrift (Fagfellevurdert)
Abstract [en]

Silicon nitride undergoes hydrolysis and dissolution when subjected to an aqueous environment. Molecular dynamics simulations suggest that hydrolysis proceeds through nucleophilic attack of water with the formation of an intermediate molecular complex involving a penta-coordinated silicon. We found that the dissolution of an oxidized silicon nitride powder resembles that of silica: the dissolution rate could be described using a simple kinetic equation with a dissolution activation energy of 52 kJ/mol. The deagglomeration of a fine silicon nitride powder under mild agitation was evaluated; we show that the peptization kinetics at room temperature is dominated by the break-up of particle-particle bonds due to hydrodynamic friction and cluster attrition. For break-up of hard agglomerates of small particles the dissolution of interparticle necks will play an important role

sted, utgiver, år, opplag, sider
2000. Vol. 83, s. 2394-2400
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Identifikatorer
URN: urn:nbn:se:ri:diva-26618OAI: oai:DiVA.org:ri-26618DiVA, id: diva2:1053621
Merknad
A1349Tilgjengelig fra: 2016-12-08 Laget: 2016-12-08 Sist oppdatert: 2017-11-29bibliografisk kontrollert

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