Sinterabilidade de materiais de ferramenta de corte em gradação funcional com três camadas


Functionally graded material (FGM) is a structure constituted of two phases at least, where the volume fraction of second phase increases across the thickness of the material in a gradient which may be continuous or stepwise. This principle provides the solution to many advanced applications, where two or more materials with distinct properties are required to be put together; as example, structural parts capable of endure high temperature exposure wear resistance. Meanwhile, the aim is to show the sinterability of cutting tool materials (Al₂O₃-ZrO₂, Al₂O₃-Tic e WC-Co) in functionally gradient, considering density analysis, microstructure and residual stress. The sintering was carried out by Spark Plasma Sintering (SPS), following a2², factorial design, in which the input variables were the concentration of materials mixtures (Al₂O₃-ZrO₂ with 10%v WC-Co, Al₂O₃-ZrO₂ with 30%v WC-Co and Al₂O₃-TiC pure) and the holding time of sintering temperature (6 and 12 minutes). The results showed significative influence of holding time over density, besides cracks were observed ion the ceramic layer containing, alumina and delamonation at the interface with cemented carbide, which can be explained by the difference of residual stress.

CARNEIRO, Marcelo Bertolete; CRUZ, Israel Aparecido; FREDERICCI, Cátia; MACHADO, Izabel Fernanda. Sinterabilidade de materiais de ferramenta de corte em gradação funcional com três camadas. In: CONGRESSO NACIONAL DE ENGENHARIA MECÂNICA, 7., 2012, São Luís. Anais… Rio de Janeiro: ABCM, 2012. 8 p.

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