Properties of Y-TZP/Al2O3 ceramic nanocomposites obtained by high-energy ball milling

Autor(es)

Santos, C. ^{[1, 2]} ; Koizumi, M. H. ^[2] ; Daguano, J. K. M. F. ^[2] ; Santos, F. A. ^[2] ; Elias, C. N. ^{[3, 1]} ; Ramos, A. S. ^[4]

Afiliação do(s) autor(es)

^[1] UERJ, FAT, BR-27511971 Resende, RJ - Brazil

^[2] Univ Sao Paulo, EEL, BR-12600000 Lorena, SP - Brazil

^[3] IME, DCEM, BR-22290270 Rio De Janeiro - Brazil

^[4] UNIVAP, IP&D, BR-12244000 Sao Jose Dos Campos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING; v. 502, n. 1-2, p. 6-12, FEB 25 2009.
• Citações Web of Science: 23

Resumo

In this work, the synthesis of Y(2)O(3) stabilized tetragonal zirconia polycrystals (Y-TZP)-alumina (Al(2)O(3)) powder mixture was performed by high-energy ball milling and the sintering behavior of this composite was investigated. In order to understand the phase transformations occurring during ball milling, samples were collected after different milling times, from 1 to 60 h. The milled powders were compacted by cold uniaxial pressing and sintered at 1400 and 1600 degrees C. Both powders and sintered samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectrometry analysis (EDS) and mechanical properties. Fully dense samples were obtained after sintering at 1600 degrees C, while the samples sintered at 1400 degrees C presented a full density for powder mixtures milled for 30 and 60 h. Fracture toughness and Vickers hardnessvalues of the Y-T-ZP/Al(2)O(3) nanocomposite were improved due to dispersed Al(2)O(3) grains and reduced ZrO(2) grain size. Samples sintered at 1400 degrees C, based on powders milled for 60 h, presented high K(IC) and hardness values near to 8.0 Mpan(1/2) and 15 GPa, respectively (C) 2008 Elsevier B.V. All rights reserved (AU)

• Processo FAPESP: 05/51337-9 - Moagem de alta energia: influencia das caracteristicas das particulas na microestrutura e resistencia a fratura do composito zro2-al2o3.
• Beneficiário: Manuela Harue Koizumi
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 04/04386-1 - Desenvolvimento e caracterização de pilares cerâmicos biocompatíveis à base de compósitos Zr02-Al2O3
• Beneficiário: Claudinei dos Santos
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores