Effects of ball milling and particle size on microstructure and properties 5083 Al–Ni composites fabricated by friction stir processing

2015 ◽  
Vol 645 ◽  
pp. 205-212 ◽  
Author(s):  
C.N. Shyam Kumar ◽  
Devinder Yadav ◽  
Ranjit Bauri ◽  
G.D. Janaki Ram
Keyword(s):  
Particle Size ◽  
Ball Milling ◽  
Friction Stir Processing ◽  
Friction Stir ◽  
Microstructure And Properties

Effect of Milling Medium on Alumina Additivated with Niobia

2014 ◽  
Vol 798-799 ◽  
pp. 677-681
Author(s):  
Willian Trindade ◽  
Marcelo Henrique Prado da Silva ◽  
Alaelson Vieira Gomes ◽  
Carlos Frederico Matos Chagas ◽  
Luis Henrique Leme Louro
Keyword(s):  
Particle Size ◽  
Grain Size ◽  
Ball Milling ◽  
Sintering Temperature ◽  
Ceramic Particle ◽  
Microstructure And Properties ◽  
Sintering Additive ◽  
Final Density ◽  
Significant Contamination ◽  
Milling Medium

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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