Effect of Al2O3-NbC nanopowder incorporation on the mechanical properties of 3Y-TZP/Al2O3-NbC nanocomposites obtained by conventional and spark plasma sintering

Autor(es)

Salem, R. E. P. ^[1] ; Monteiro, F. R. ^[2] ; Gutierrez-Gonzalez, C. F. ^[3] ; Borrell, A. ^[4] ; Salvador, M. D. ^[4] ; Chinelatto, A. S. A. ^[2] ; Chinelatto, A. L. ^[2] ; Ferreira, J. A. ^[1] ; Pallone, E. M. J. A. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Fac Zootecnia & Engn Alimentos, Av Duque de Caxias Norte 225, Caixa Postal 23, BR-13635900 Pirassununga, SP - Brazil

^[2] Univ Estadual Ponta Grossa, Dept Engn Mat, Av Gal Carlos Cavalcanti 4748, BR-84030900 Ponta Grossa, PR - Brazil

^[3] Univ Oviedo, CSIC, Ctr Invest Nanomat & Nanotecnol, Ave Vega 4-6, El Entrego 33940 - Spain

^[4] Univ Politecn Valencia, ITM, Camino Vera S-N, E-46022 Valencia - Spain

• Tipo de documento: Artigo Científico
• Fonte: CERAMICS INTERNATIONAL; v. 44, n. 2, p. 2504-2509, FEB 1 2018.
• Citações Web of Science: 2

Resumo

The incorporation of Al2O3-NbC-nanopowder reinforcement in a 3Y-TZP matrix, and its influence on the mechanical properties of 3YTZP/Al2O3-NbC nanocomposites, obtained by conventional and spark plasma sintering (SPS), was investigated. Nanometric powders of Al2O3-NbC were prepared by reactive high-energy milling, deagglomeration, and leaching with acid, and added to the 3Y-TZP matrix, at a proportion of 5 vol%. The final powders were dried under airflow, compacted, and sintered in the temperature range of 1300-1500 degrees C. The effects of the sintering technique and final temperature, on the microstructure and mechanical properties, such as hardness, toughness, and Young's modulus, were analysed. Fracture toughness of the material reinforced with Al2O3-NbC nanopowders, which is one of its most important properties, differed significantly from that of the 3Y-TZP monolith (5.2 MPa m(1/2)). The nanocomposites, sintered conventionally at 1450 degrees C, showed higher fracture toughness (8.7 MPa m(1/2)). Microstructure observations indicated that NbC nanoparticles were dispersed homogeneously within the 3Y-TZP matrix, and limited its grain growth. However, partial oxidation of the NbC on the nanocomposite surface, at the conventional sintering temperature of 1500 degrees C, caused a reduction in the fracture toughness. (AU)

• Processo FAPESP: 15/07319-8 - Estudo de sinterização ultra rápida e de baixo consumo energético: flash Sintering
• Beneficiário: Eliria Maria de Jesus Agnolon Pallone
• Modalidade de apoio: Auxílio à Pesquisa - Regular