2014•Cadernos UniFOAOpen access
Densification and Mechanical Properties of sintered Al2O3-Y3Al5O12 ceramic composite
Claudinei dos Santos, Flavio Jose Paneto, Joaquim Lopes Pereira, Jean de Lima Oliveira, Edson de Jesus Filho, Leandro Anselmo da Silva, Eduardo de Sousa Lima, Ricardo de Freitas Cabral
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Abstract
In this work, Al 2 O 3 -Y 3 Al 5 O 12 ceramic composites were developed with different proportions of Al 2 O 3 -Y 2 O 3 , which were mixed and compacted at different pressures of 40MPa to 100MPa, being consequently sintered at 160°C-2h. The sintered samples were characterized by X-ray diffraction presenting a-Al 2 O 3 and Y 3 Al 5 O 12 as crystalline phases. Samples with relative densities ranging from 78 to 80% and 87 to 91% were obtained depending on the composition and the compaction pressure used. The hardness values obtained were of 1010 to 1080HV and 370-470HV, for mixes Al 2 O 3 -Y 2 O 3 having the composition with levels of 20 and 36.5wt.%, respectively.