ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
In this work the cyclic fatigue life of 3mol.%Y2O3-stabilized zirconia polycrystallineceramics, doped with 5%wt 3CaO.P2O5,-SiO2-MgO, has been investigated. Samples with 5 and10%wt were cold uniaxial pressed (80MPa) and sintered in air at 1200 and 1300oC for 120 minutes.Sintered samples were characterized by X-Ray diffraction and Scanning Electronic Microscopy.Hardness and fracture toughness were determined using Vicker’s indentation method, and Modulusof Rupture was determined by four-point bending testing. Furthermore, the cyclic fatigue tests werealso realized by four-point bending tests, under frequency of 25 Hz and stress ratio, R, of 0.1, for thebest condition. In this condition, highly dense samples were obtained and presented values ofhardness, fracture toughness and bending strength of 11.3 ±0.1GPa, 6.1±0.4MPa.m1/2 and320±55MPa, respectively. The increasing of stress level leads to decreasing of the number of cyclesand the number of run-out specimens. The stress induced tetragonal-monoclinic (t-m)-ZrO2transformation, observed by X-Ray diffraction, contributes to the increasing of the fatigue life.Samples 3Y-TZP presents clearly a range of loading conditions where cyclic fatigue can bedetected
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.591-593.628.pdf
