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Effect of the addition of glasses as sintering aids on microstructure and properties of nanoalumina

ABSTRACT Alumina-Glass compositions were prepared to evaluate the effect of glass as sintering aids. The composites showed densification below 1100°C. The highest density values (~95%) were obtained for compositions based respectively on borosilicate (G2 and G3) and soda lime glasses (G4), all [A1]...

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Bibliographic Details
Published in:Matéria 2020, Vol.25 (1)
Main Authors: Silva, Larissa Bezerra da, Blaese, Diego, Peres, Ana Paula da Silva, Costa, Antonio Carlos Silva da, Acchar, Wilson
Format: Article
Language:English
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Summary:ABSTRACT Alumina-Glass compositions were prepared to evaluate the effect of glass as sintering aids. The composites showed densification below 1100°C. The highest density values (~95%) were obtained for compositions based respectively on borosilicate (G2 and G3) and soda lime glasses (G4), all [A1] [A2] containing Na in the precursor powder. Samples G1 (K-based) and G5 (no K or Na in the precursor glass powder) presented irregular morphology with the presence of intergranular porosity. The composition G2, G3, and G4 presented uniform morphology corresponding to higher densification. RESUMO As composições de alumina-reforço foram preparadas para avaliar o efeito da fase vítrea como auxiliar de sinterização. Os compósitos apresentaram densificação abaixo de 1100 ° C. Os maiores valores de densidade (~ 95%) foram obtidos para composições baseadas respectivamente em vidros de borossilicato (G2 e G3) e soda e cal (G4), todos contendo Na no pó precursor. As amostras G1 (à base de K) e G5 (sem K ou Na no pó do vidro precursor) apresentaram morfologia irregular com presença de porosidade intergranular. As composições G2, G3 e G4 apresentaram morfologia uniforme, correspondendo a uma maior densificação.
ISSN:1517-7076
1517-7076
DOI:10.1590/s1517-707620200001.0910