Mechanical Properties of Dental Zirconia Ceramics Changed with Sandblasting and Heat Treatment

2008 ◽  
Vol 27 (3) ◽  
pp. 408-414 ◽  
Author(s):  
Hideo SATO ◽  
Kiyotaka YAMADA ◽  
Giuseppe PEZZOTTI ◽  
Masahiro NAWA ◽  
Seiji BAN
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Zirconia Ceramics ◽  
Dental Zirconia Ceramics

Study on Dental Colored Zirconia Restoration

2008 ◽  
Vol 368-372 ◽  
pp. 1255-1257 ◽  
Author(s):  
Ning Wen ◽  
Yuan Fu Yi ◽  
Wei Wei Zhang ◽  
Hong Chen Liu ◽  
Long Quan Shao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Bending Strength ◽  
Erbium Oxide ◽  
Zirconia Ceramics ◽  
Three Point Bending ◽  
Dental Application ◽  
Porous Microstructure ◽  
L Value ◽  
Dental Zirconia Ceramics

This paper explored the color and mechanical properties of CeO2 and Er2O3 shaded zirconia ceramics for dental application. Twelve kinds of colored dental ZrO2 powders were prepared. Experimental results showed that the hue of the materials shift from yellow-green to yellow-red with the increasing concentration of the CeO2 and Er2O3, while reducing of the brightness( L* ) value was little. Three-point bending strength decreased form 1209MPa to 845MPa after coloring, which was lower than the uncolored materials (1301MPa). The fracture toughness decrease slightly. SEM observation revealed more porous microstructure in specimen containing both two additives. Cerium oxide and erbium oxide are candidates of color additives for shading dental zirconia ceramics.

Effect of heat treatment and in vitro aging on the microstructure and mechanical properties of cold isostatic-pressed zirconia ceramics for dental restorations

2014 ◽  
Vol 30 (10) ◽  
pp. e272-e282 ◽  
Author(s):  
Anna Vatali ◽  
Eleana Kontonasaki ◽  
Panagiotis Kavouras ◽  
Nikolaos Kantiranis ◽  
Lambrini Papadopoulou ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Zirconia Ceramics ◽  
Dental Restorations ◽  
Microstructure And Mechanical Properties ◽  
In Vitro Aging

Influence of Sintering Process on the Mechanical Properties of Dental Zirconia Ceramics

2013 ◽  
Vol 738-739 ◽  
pp. 542-545
Author(s):  
W.U. Park ◽  
J.M. Zhao ◽  
Kyu Hong Hwang ◽  
T.S. Kim ◽  
C.H. Yu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Flexural Strength ◽  
Microwave Sintering ◽  
Electric Heating ◽  
Sintering Process ◽  
Zirconia Ceramics ◽  
Sintering Time ◽  
Dental Zirconia Ceramics ◽  
Sintering Method ◽  
Sintering Condition

Densification and mechanical properties of dental zirconia ceramics were evaluated by different sintering methods. Y-TZP zirconia block was used in this study. Sintering were performed in electric heating furnace and microwave sintering furnace, and then experimented and analyzed on a change in densification according to the sintering time, a change in densification according to thickness, flexural strength and micro-structure of zirconia specimens. Microwave sintering was very effective in considerable mechanical properties such as flexural strength and bulk density was drastically increased than conventional electric heating method. It is also shown that microwave sintering was faster and more economical than common method to be present in qualities which equal or exceed. It will be important to seek the accurate sintering condition of dental zirconia by microwave sintering method and the continuous research is necessary for the study of relationship between sintering methods and mechanical properties.

Synthesis of Coloured Dental Zirconia Ceramics and their Mechanical Behaviors

2014 ◽  
Vol 602-603 ◽  
pp. 594-597 ◽  
Author(s):  
Jing Li ◽  
Shi Ming Liu ◽  
Yuan Hua Lin
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Grain Size ◽  
Phase Composition ◽  
Bending Strength ◽  
Linear Shrinkage ◽  
Zirconia Ceramic ◽  
Mechanical Behaviors ◽  
Zirconia Ceramics ◽  
Dental Zirconia Ceramics

The effects of Pr6O11 and Er2O3 dopants on microstructure and mechanical properties of zirconia ceramics were investigated. The phase composition and microstructure analysis indicate that samples are all tetragonal phase and grain size is about 50-100 nm. The relative density of zirconia ceramics was above 99.1%, linear shrinkage was nearly 20%, while Vickers hardness was over 12.5 GPa. Three-points bending strength was over 850 MPa which was slightly lower than that of the pure samples, and fracture toughness was above 4.9 MPa*m1/2. The results show that the dopants can be used to obtain the colored zirconia ceramic, and also have effects on its mechanical properties.

Crystallization of MgO • Al2 • SiO2 • ZrO2 glasses

1986 ◽  
Vol 44 ◽  
pp. 440-441
Author(s):  
M. A. McCoy
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Powder Processing ◽  
Glass Composition ◽  
Ceramic Powder ◽  
Transformation Toughening ◽  
Ceramic Powder Processing ◽  
Processing Techniques ◽  
Ceramic Matrices

Transformation toughening by ZrO2 inclusions in various ceramic matrices has led to improved mechanical properties in these materials. Although the processing of these materials usually involves standard ceramic powder processing techniques, an alternate method of producing ZrO2 particles involves the devtrification of a ZrO2-containing glass. In this study the effects of glass composition (ZrO2 concentration) and heat treatment on the morphology of the crystallization products in a MgO•Al2•SiO2•ZrO2 glass was investigated.

INFLUENCE THE QUENCHING AND TEMPERING ON THE MICROSTRUCTURE, MECHANICAL PROPERTIES AND SURFACE ROUGHNESS, OF MEDIUM CARBON STEEL

2018 ◽  
Vol 18 (1) ◽  
pp. 125-135
Author(s):  
Sattar H A Alfatlawi
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Surface Roughness ◽  
Carbon Steel ◽  
Cold Water ◽  
Medium Carbon Steel ◽  
Medium Carbon ◽  
Heating And Cooling ◽  
Treatment Processes ◽  
Quenching And Tempering

One of ways to improve properties of materials without changing the product shape toobtain the desired engineering applications is heating and cooling under effect of controlledsequence of heat treatment. The main aim of this study was to investigate the effect ofheating and cooling on the surface roughness, microstructure and some selected propertiessuch as the hardness and impact strength of Medium Carbon Steel which treated at differenttypes of heat treatment processes. Heat treatment achieved in this work was respectively,heating, quenching and tempering. The specimens were heated to 850°C and left for 45minutes inside the furnace as a holding time at that temperature, then quenching process wasperformed in four types of quenching media (still air, cold water (2°C), oil and polymersolution), respectively. Thereafter, the samples were tempered at 200°C, 400°C, and 600°Cwith one hour as a soaking time for each temperature, then were all cooled by still air. Whenthe heat treatment process was completed, the surface roughness, hardness, impact strengthand microstructure tests were performed. The results showed a change and clearimprovement of surface roughness, mechanical properties and microstructure afterquenching was achieved, as well as the change that took place due to the increasingtoughness and ductility by reducing of brittleness of samples.

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