Tecnologia em Metalurgia, Materiais e Mineração
https://tecnologiammm.com.br/article/doi/10.4322/tmm.00403005
Tecnologia em Metalurgia, Materiais e Mineração
Artigo Original

BIOCERÂMICAS À BASE DE ZrO2-TETRAGONAL OBTIDAS POR SINTERIZAÇÃO VIA FASE LÍQUIDA

BIOCERAMICS BASED ON TETRAGONAL-ZrO2 OBTAINED BY LIQUID PHASE SINTERING

Habibe, Alexandre Fernandes; Souza, Renato Chaves; Maeda, Loriane David; Bicalho, Luiz de Araujo; Barboza, Miguel Justino R.; Santos, Claudinei

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Resumo

Nesse trabalho são avaliadas as propriedades mecânicas de cerâmicas à base de ZrO2 sinterizadas por fase líquida de um potencial biocerâmico para aplicação em sistemas de implantes dentários. Pós de ZrO2 estabilizado com Y2O3 foram misturados com 3%, 5%, 10%, 20% ou 30% em peso de um biovidro do sistema 3CaO.P2O5-MgO-SiO2. Essas misturas de pós foram compactadas e sinterizadas a 1.200°C e 1.300°C, por 120 minutos. Após resfriamento, os corposde- prova foram retificados, lixados e polidos, sendo então submetidos à avaliação de dureza Vickers, tenacidade à fratura e resistência à fratura por ensaio de flexão em quatro pontos. Amostras com menores teores de aditivo e sinterizadas a 1.300°C apresentaram valores médios de dureza de 1170 HV, tenacidade à fratura de 6,3 MPa.m1/2 com resistência à flexão de 453 MPa. Comparativamente, amostras de ZrO2(3%Y2O3) sinterizadas de forma similar apresentaram dureza de 875 HV, KIC de 4,1 MPa.m1/2 e resistência à flexão de 127 MPa, indicando que a presença de fase líquida possibilita reduzir a porosidade do material, promovendo aumento das propriedades mecânicas dos materiais cerâmicos à base de ZrO2.

Palavras-chave

Biomateriais, Caracterização, Citotoxicidade

Abstract

The objective of this work is the evaluation of the mechanical properties of ZrO2 ceramics sintered by liquid phase. Y2O3-stabilized-ZrO2 ceramic powder was mixed at 3%, 5%, 10%, 20% or 30 wt.% of bioglass of 3CaO.P2O5-MgOSiO 2 system. These powder mixtures were compacted and sintered at 1.200°C and 1300°C, for 120 min. After cooling, samples were grinded, polished and evaluated by Vickers hardness, fracture toughness and four-point bending strength. Samples sintered at 1.300°C with low bioglass content showed hardness of 1170 HV, fracture toughness of 6.3 MPa.m1/2 with bending strength of 453 MPa. Comparatively, samples of ZrO2(3%Y2O3) sintered in the similar conditions, showed hardness of 875 HV, KIC of 4.1 MPa.m1/2 and bending strength of 127 MPa, indicating that the presence of liquid phase contributed with the decreasing of porosity, increasing the mechanical properties of the ceramic materials based on ZrO

Keywords

Biomaterials, Characterization, Citotoxicicity

Referências



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