Performance of 3Y-TZP bioceramics under cyclic fatigue loading

Author(s)

Renato Chaves Souza ^[1] ; Claudinei dos Santos ^[2] ; Miguel Justino Ribeiro Barboza ^[3] ; Carlos Antonio Reis Pereira Baptista ^[4] ; Kurt Strecker ^[5] ; Carlos Nelson Elias ^[6]

Affiliation

^[1] Universidade de São Paulo. Escola de Engenharia de Lorena - Brasil

^[2] Universidade de São Paulo. Escola de Engenharia de Lorena - Brasil

^[3] Universidade de São Paulo. Escola de Engenharia de Lorena - Brasil

^[4] Universidade de São Paulo. Escola de Engenharia de Lorena - Brasil

^[5] Universidade Federal de São João delRei. Departamento de Engenharia Mecânica - Brasil

^[6] Instituto Militar de Engenharia - Brasil

• Document type: Journal article
• Source: MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS; v. 11, n. 1, p. 89-92, 2008-03-00.

Abstract

In this work, the static mechanical properties and cyclic fatigue life of 3 mol. (%) Y2O3-stabilized tetragonal zirconia polycrystalline (3Y-TZP) ceramics were investigated. Pre-sintered samples were sintered in air at 1600 °C for 120 minutes, and characterized by X ray diffraction and scanning electronic microscopy. Hardness and fracture toughness were determined by Vicker's indentation method, and Modulus of Rupture was determined by four-point bending testing. Fully dense sintered samples, near to 100% of theoretical density, presented hardness, fracture toughness and bending strength of 13.5 GPa, 8.2 MPa.m½ and 880 MPa, respectively. The cyclic fatigue tests were also realized using four-point bending testing, within a frequency of 25 Hz and stress ratio R of 0.1. The increasing of load stress lead to decreasing of the number of cycles and the run-out specimens number. The tetragonal-monoclinic (t-m) ZrO2-transformation observed by X ray diffraction contributes to the increasing of the fatigue life. The 3Y-TZP samples clearly presents a range of loading conditions where cyclic fatigue can be detected. (AU)