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Processamento de nitreto de silício utilizando-se técnicas de filtração coloidal

Authors: Mello-Castanho, Sonia R.;

Processamento de nitreto de silício utilizando-se técnicas de filtração coloidal

Abstract

Apresentam-se os estudos relacionados ao processamento de pós de Si3N4, sistematizando-se cada etapa dos processos de conformação por colagem e colagem sob pressão. A avaliação das propriedades eletroforéticas e do comportamento reológico possibilitou a preparação de suspensões aquosas concentradas de Si3N4 estáveis e homogêneas. Os estudos cinéticos foram realizados em função da pressão aplicada e dos aditivos de sinterização. As análises de superfície dos pós (XPS) demonstraram que com o controle dos parâmetros estudados é possível a obtenção de peças a verde de Si3N4 com baixa oxidação superficial. Produziu-se cerâmicas densas de Si3N4 (96%DT) com boas propriedades mecânicas (E = 312 GPa, KIC = 6,2 MPa.m1/2 ), tanto a temperatura ambiente como em altas temperaturas (1200 e 1300°C), compatíveis com os valores reportados na literatura.

Peer reviewed

Keywords

Nitreto de silício, Colagem, Química de superfície, Reologia

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selected citations
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This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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