A structural study of metastable tetragonal zirconia in an Al2O3-ZrO2-SiO2-Na2O glass ceramic system

1980 ◽  
Vol 15 (11) ◽  
pp. 2693-2700 ◽  
Author(s):  
G. Fagherazzi ◽  
S. Enzo ◽  
V. Gottardi ◽  
G. Scarinci
Keyword(s):  
Structural Study ◽  
Glass Ceramic ◽  
Tetragonal Zirconia ◽  
Ceramic System ◽  
Metastable Tetragonal Zirconia

Impact of Silane-containing Universal Adhesive on the Biaxial Flexural Strength of a Resin Cement/Glass-ceramic System

2019 ◽  
Vol 44 (2) ◽  
pp. 200-209 ◽  
Author(s):  
F Murillo-Gómez ◽  
RB Wanderley ◽  
MF De Goes
Keyword(s):  
Flexural Strength ◽  
Glass Ceramic ◽  
Resin Cement ◽  
Weibull Analysis ◽  
Ceramic System ◽  
Universal Adhesive ◽  
Bonded Interface ◽  
Biaxial Flexural Strength ◽  
Digital Caliper ◽  
One Way Anova

SUMMARY The aim of this study was to determine whether using a silane-containing universal adhesive as a silane primer in glass-ceramic/resin cement systems affects biaxial flexural strength (BFS) and bonded interface integrity after loading. Glass-ceramic (IPS e.max CAD, Ivoclar/Vivadent, Schaan, Liechtenstein) disc-shaped specimens (6.5±0.1mm in diameter, 0.5±0.1mm thick) were etched with 5% hydrofluoric acid (HF) for 20 seconds and divided into four groups of 30 specimens, to be treated as follows: 1) One bottle silane primer (RCP); 2) Separate application of silane and adhesive (RCP+SB); 3) Silane-containing universal adhesive (SBU); 4) No treatment (C). After silanization, all specimens were resin cement– coated and polymerized for 40 seconds. Each specimen layer was measured, as well as each assembly's thickness, using a digital caliper and scanning electron microscope (SEM). Specimens were stored for 24 hours and submitted to a BFS test (1.27 mm/min). BFS values were calculated using the bilayer disc-specimen solution. Bonded interfaces were analyzed on fractured fragments using SEM. One-way ANOVA and Tukey tests (α=0.05) were applied, as well as the Weibull analysis. Factor “silane treatment” was statistically significant (p<0.0001). RCP+SB (372.2±29.4 MPa) and RCP (364.2±29.5 MPa) produced significantly higher BFS than did the C (320.7±36.3 MPa) or SBU (338.0±27.1 MPa) groups. No differences were found in the Weibull modulus (m: RCP: 10.1-17.3; RCP+SB: 10.1-17.0; SBU: 12.3-22.4; C: 7.4-12.9). Bonded interface analysis exhibited ceramic-cement separation (SBU, C) and voids within the resin cement layer (all groups). Neither the ceramic/cement system's BFS nor its bonded interface stability were improved by SBU after loading.

Carbon Vacancy Ordered Non-Stoichiometric ZrC0.6

2014 ◽  
pp. 667-689
Author(s):  
Wentao Hu ◽  
Yongjun Tian ◽  
Zhongyuan Liu
Keyword(s):  
Heating Temperature ◽  
Tetragonal Zirconia ◽  
Zirconium Carbide ◽  
Amorphous Layer ◽  
Plasma Sintering ◽  
Heating Treatment ◽  
Spark Plasma ◽  
Metastable Tetragonal Zirconia ◽  
Average Size ◽  
Oxygen Atoms

The starting nanopowders of non-stoichiometric zirconium carbide (ZrCx) were fabricated via milling Zr powders in toluene for different dwell times. The carbon content was determined to depend on the milling time and the used amount of toluene. The bulk non-stoichiometric ZrCx with different x were prepared by spark plasma sintering of the obtained ZrCx nanopowders. The microstructural features of a sintered ZrC0.6 sample were investigated via the measurements of XRD, TEM, and HRTEM. It was found that the carbon vacancies have an ordering arrangement in C sublattice, forming a Zr2C-type cubic superstructural phase with space group of . Moreover, it was observed that the superstructural phase exists in nano-domains with an average size of ~30 nm owing to the ordering length in nanoscale. During the heating treatment in air, it was recognized that the diffusion of oxygen atoms is significantly facilitated through the ordered carbon vacancies. For the heating treatment at low temperature (<300°C), the oxygen atoms diffuse easily into and occupy the ordered carbon vacancies, forming the oxy-carbide of ZrC0.6O0.4 with ordered oxygen atoms. At the heating temperature higher than 350°C an amorphous layer of ZrC0.6Oy>0.4 was identified to be formed due to the diffusion of superfluous oxygen atoms into Zr-tetrahedral centers. Inside the amorphous layer, the metastable tetragonal zirconia nanocrystals are recognized to be gradually developed.

Spherulitic growth of apatite in a glass—ceramic system

1986 ◽  
Vol 5 (12) ◽  
pp. 1309-1312 ◽  
Author(s):  
P. R. Carpenter ◽  
M. Campbell ◽  
R. D. Rawlings ◽  
P. S. Rogers
Keyword(s):  
Glass Ceramic ◽  
Ceramic System ◽  
Spherulitic Growth

Texture and Residual Stress Analysis by XRD on Metastable Tetragonal Zirconia Films Obtained by MOCVD

2019 ◽  
Vol 25 (8) ◽  
pp. 413-420 ◽  
Author(s):  
Mohamed Jouili ◽  
Michel Andrieux ◽  
Isabelle Gallet ◽  
Nathalie Prud'Homme ◽  
Vincent Ji
Keyword(s):  
Residual Stress ◽  
Stress Analysis ◽  
Tetragonal Zirconia ◽  
Metastable Tetragonal Zirconia ◽  
Residual Stress Analysis ◽  
Zirconia Films
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