Effect of Surface Etching on the Flexure Strength and Fracture Toughness of Dicor® Disks Containing Controlled Flaws

VC/Fe composite samples were fabricated by sintering at 1050, 1100 and 1150°C in vacuum. The microstructure and mechanical properties of samples were examined, and the relationship of structure and mechanical properties for VC/Fe composite sintered at different temperature were studied. The results show that fracture toughness, hardness and density is increasing obviously at 1050-1100°Cwith the increasing sintering temperature, but the growth trend increases slowly at 1100-1150°C; in whole process with temperature increased, Flexure strength heighten trend obviously. The microstructure of VC/Fe composite changed from particles piled up together to the microstructure particles closely, VC particles set gradually into Fe with temperature increased, and the gap reduced gradually.

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Nickel-Alumina Composites: In Situ Synthesis by a Displacement Reaction, and Mechanical Properties

MRS Proceedings ◽

10.1557/proc-365-53 ◽

1994 ◽

Vol 365 ◽

Cited By ~ 1

Author(s):

Steven A. Jones ◽

James M. Burlitch ◽

Ersan Üstündag ◽

Jeannie Yoo ◽

Alan T. Zehnder

Keyword(s):

Mechanical Properties ◽

Fracture Toughness ◽

Elastic Constants ◽

High Performance ◽

In Situ Synthesis ◽

Displacement Reaction ◽

Ductile Phase ◽

Flexure Strength ◽

Alumina Composites

ABSTRACTNickel-alumina composites have the potential to be high performance materials. Alumina, with its excellent oxidation resistance, combined with a ductile phase such as nickel may provide a tough material with a lower density and higher Young's modulus, overall, a higher specific modulus than typical Superalloys. Dense, interpenetrating Ni-Al2O3 composites were synthesized using a displacement reaction between NiO and aluminum. The resulting composites were characterized in terms of their mechanical properties such as hardness, flexure strength, fracture toughness and elastic constants. The synthesis, characterization, and mechanical properties, as well as the effect of the interpenetrating microstructure on the toughening mechanisms and other properties will be discussed.

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Mechanical Properties of Zirconia/Alumina Nano-Composite after Soaking in Various Water-Based Conditions

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.309-311.1219 ◽

2006 ◽

Vol 309-311 ◽

pp. 1219-1222 ◽

Cited By ~ 18

Author(s):

Seiji Ban ◽

Masahiro Nawa ◽

Y. Suehiro ◽

H. Nakanishi

Keyword(s):

Mechanical Properties ◽

Fracture Toughness ◽

Tetragonal Zirconia ◽

Flexure Strength ◽

Nano Composite ◽

Dental Restorations ◽

Dental Restoratives ◽

All Ceramic ◽

Water Based ◽

Before And After

Yttria stabilized tetragonal zirconia polycrystals (Y-TZP) have been applied to dental crown and bridges. Whereas, to further improve its mechanical strength, the zirconia/alumina nano-composite stabilized with cerium oxide (Ce-TZP/Al2O3 nano-composite) was developed. In the present study, biaxial flexure strength, fracture toughness and hardness were determined before and after soaking in water-based conditions and the possibility of application to all ceramic dental restorations was discussed. In comparison to Y-TZP, Ce-TZP/Al2O3 nano-composite has quite high flexure strength and fracture toughness along with satisfied durability for LTAD in various water-based conditions encountered in dentistry. Therefore, it is concluded that the nano-composite can be safely applied to dental restoratives such as all-ceramic bridges.

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