Effect of Milling Medium on Alumina Additivated with Niobia

Willian Trindade; Marcelo Henrique Prado da Silva; Alaelson Vieira Gomes; Carlos Frederico Matos Chagas; Luis Henrique Leme Louro

doi:10.4028/www.scientific.net/MSF.798-799.677

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HomeMaterials Science ForumMaterials Science Forum Vols. 798-799Effect of Milling Medium on Alumina Additivated...

Effect of Milling Medium on Alumina Additivated with Niobia

Abstract:

Niobia has been successfully used as sintering additive to alumina in order to lower its sintering temperature. This effect can also be obtained by reducing the ceramic particle size. This work investigated the effect of the particle size on the ceramic final density of alumina with 4 wt% niobia. For that two milling media were used. The as-received powders were submitted to ball and planetary milling and then sintered at 1450°C. The planetary milling medium was more efficient in reducing particle size when compared to ball milling. However, planetary milling caused significant contamination in the niobia powder, from the alumina balls used as milling agents. It forced composition balance in order to keep the original proposed formulation. The planetary milled sintered samples showed better densification and lower grain size in comparison with ball milled ones. It could be concluded that the milling medium choice directly affected both microstructure and properties of the sintered alumina with 4wt% of niobia. .

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Periodical:

Materials Science Forum (Volumes 798-799)

Pages:

677-681

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.798-799.677

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Online since:

June 2014

Authors:

Willian Trindade*, Marcelo Henrique Prado da Silva, Alaelson Vieira Gomes, Carlos Frederico Matos Chagas, Luis Henrique Leme Louro

Keywords:

Alumina, Ball Milling, Niobia, Planetary Milling

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