Si3N4 ceramic cutting tool sintered with CeO2 and Al2O3 additives with AlCrN coating
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Data
2011-12-01
Autores
Souza, José Vitor Candido
Silva, Olivério Moreira de Macedo
Nono, Maria do Carmo Andrade
Machado, João Paulo Barros
Pimenta, Marcelo
Ribeiro, Marcos Valério [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
ABM, ABC, ABPol
Resumo
Ceramic cutting tools are showing a growing market perspective in terms of application on machining operations due to their high hardness, wear resistance, and machining without a cutting fluid, therefore are good candidates for cast iron and Nickel superalloys machining. The objective of the present paper was the development of Si3N4 based ceramic cutting insert, characterization of its physical and mechanical properties, and subsequent coating with AlCrN using a PVD method. The characterization of the coating was made using an optical profiler, XRD, AFM and microhardness tester. The results showed that the tool presented a fracture toughness of 6.43 MPa.m½ and hardness of 16 GPa. The hardness reached 31 GPa after coating. The machining tests showed a decrease on workpiece roughness when machining with coated insert, in comparison with the uncoated cutting tool. Probably this fact is related to hardness, roughness and topography of AlCrN.
Descrição
Palavras-chave
AlCrN, ceramic cutting tool, mechanical properties, coating
Como citar
Materials Research. ABM, ABC, ABPol, v. 14, n. 4, p. 514-518, 2011.