Porous yttria-Stabilized Zirconia Ceramics Fabricated by Nonaqueous-Based Gelcasting Process with PMMA Microsphere as Pore-Forming Agent

2012 ◽  
Vol 96 (1) ◽  
pp. 266-271 ◽  
Author(s):  
Jun Zhou ◽  
Chang-An Wang
Keyword(s):  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia ◽  
Zirconia Ceramics ◽  
Pmma Microsphere ◽  
Gelcasting Process

Roughness and its effects on flexural strength of dental yttria-stabilized zirconia ceramics

2019 ◽  
Vol 739 ◽  
pp. 149-157 ◽  
Author(s):  
José Eduardo Vasconcellos Amarante ◽  
Marcos Venícius Soares Pereira ◽  
Grace Mendonça de Souza ◽  
Manuel Fellipe R. Pais Alves ◽  
Bruno Galvão Simba ◽  
...  
Keyword(s):  
Flexural Strength ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia ◽  
Zirconia Ceramics

Mechanical and Structural Properties of Ion Implanted Yttria Stabiizeed Zirconia Ceramics

1983 ◽  
Vol 24 ◽  
Author(s):  
J. K. Cochran ◽  
K. O. Legg ◽  
H. F. Solnick-Legg
Keyword(s):  
Fracture Toughness ◽  
Penetration Depth ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia ◽  
Zirconia Ceramics ◽  
Mechanical And Structural Properties ◽  
Knoop Microhardness ◽  
Vicker’S Microhardness ◽  
Reflection Electron Diffraction ◽  
Indenter Penetration

ABSTRACTSingle crystal yttria stabilized zirconia was implanted with 100 keV Ca+, Al+, and O2+ ions at fluences of 1015 to 6 × 1016 ions/cm2; . Blistering was observed at doses of 3 × 1016; O2;+ cm−2; and 6 × 1016; Al+ cm−2; but none was evident with Ca+. Knoop microhardness with a shallow indenter penetration depth peaked at a dose of 1016; ions/cm−2; for both Al+ and O2;+ but Ca+ produced no effect on microhardness. Vicker's microhardness with a much greater indenter penetration depth was not changed detectably by implantation but fracture toughness measurements from the same Vicker's indentations exhibited 10–23% increases at the highest O2+ doses and 20–25% increases at high Al+ doses. Annealing the highest implant doses at 1200° reduced the fracture toughness to pre-implant levels. Reflection electron diffraction showed that the surface had not been made amorphous by the 6 × 1016; Al+ dose as a well crystallized diffraction pattern was obtained.

High-pressure sintered yttria stabilized zirconia ceramics

2009 ◽  
Vol 35 (1) ◽  
pp. 453-456 ◽  
Author(s):  
Q. Li ◽  
Y.F. Zhang ◽  
X.F. Ma ◽  
J. Meng ◽  
X.Q. Cao
Keyword(s):  
High Pressure ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia ◽  
Zirconia Ceramics

Microstructure and Mechanical Properties of Multiscale Zirconia Ceramics Prepared by Field Assisted Sintering Technique

2016 ◽  
Vol 697 ◽  
pp. 354-359
Author(s):  
Khalid Eltayeb ◽  
Dong Qin Jin ◽  
Young Hwan Han ◽  
Fei Chen ◽  
Qiang Shen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Flexural Strength ◽  
Yttria Stabilized Zirconia ◽  
Milling Machine ◽  
Stabilized Zirconia ◽  
Zirconia Ceramics ◽  
Dense Structure ◽  
Zirconia Composites ◽  
20 Nm ◽  
Field Assisted Sintering

Two kinds of powders of 3 mol. % yttria stabilized zirconia (3Y–TZP) with different particles sizes; one was 20 nm denoted by N whereas the other was 0.5 µm denoted by M, were mechanically mixed via ball milling machine using different amounts of N wt. % to obtain multiscale zirconia composite powder. Then the mixed powders were sintered by field assisted sintering technique (FAST). The effect of N content on the microstructure as well as on mechanical properties of zirconia is investigated. Results show that the microstructure of M completely surrounded by N emerged in zirconia composites, and tetragonal phase is presented in all the sintered samples. The obtained zirconia ceramics with 15 wt. % N own a highly dense structure (~ 99.9 % relative density) and high flexural strength of 813.59 MPa wherein a 15 % increase in flexural strength compared to zirconia ceramics without adding N, but the fracture toughness of the composites just lightly decreases. The improved flexural strength of the composites is caused by the multiscale effect.

Electron-microscopy studies of grain boundary phases and fracture in yttria-zirconia ceramics

1996 ◽  
Vol 54 ◽  
pp. 684-685
Author(s):  
S.E. Lash ◽  
H. Pham ◽  
A. Cooper ◽  
M.L. Mecartney
Keyword(s):  
Tetragonal Zirconia ◽  
Sem Analysis ◽  
Yttria Stabilized Zirconia ◽  
Transgranular Fracture ◽  
Stabilized Zirconia ◽  
Zirconia Ceramics ◽  
Sem Images ◽  
Intergranular Phase ◽  
Wavy Surfaces ◽  
Metastable Tetragonal Zirconia

Trace amounts of intergranular silicate phases in zirconia ceramics are known to be significant factors in modifying the ionic conductivity of cubic yttria stabilized zirconia and in enhancing high temperature superplastic deformation behavior of tetragonal yttria stabilized zirconia. This work studies how the composition and distribution of the intergranular phase affect fracture.Samples were prepared of yttria stabilized zirconia ceramics with 3 mol% yttria (3Y-TZP, metastable tetragonal zirconia) and 8 mol% yttria (8Y-FSZ, fully stabilized cubic zirconia). Additions of 1 wt.% of a barium silicate glass or a borosilicate glass were made prior to sintering so that different intergranular phases could be formed. Samples were sintered at 1400-1600°C for 2-21 h. SEM images of fracture surfaces were digitized and analyzed using Adobe Photoshop and Prismview programs.Figure la shows the SEM analysis of a fracture surface of a 3Y-TZP sample sintered 1500°C for 10 hours. Transgranular fracture is indicated by the rough and wavy surfaces. Approximately 30% of the fracture is transgranular fracture.

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