Fracture Resistance of Surface-Nitrided Zirconia

Feder, A.; Casellas, Daniel; Llanes, L.; Anglada, M.

doi:10.4028/www.scientific.net/kem.206-213.669

Cited by 2 publications

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“…Because aging degradation starts as a surface phenomenon, surface treatments (cementation and nitridation) may help prevent aging and retain the good mechanical properties of 3Y-TZP (84)(85)(86). Such surface treatments can completely suppress aging of the surface (84); its mechanical properties are completely retained even after severe aging.…”

Section: Influence Of Processing and Microstructure On Agingmentioning

confidence: 99%

Low-Temperature Degradation of Zirconia and Implications for Biomedical Implants

Chevalier

Grémillard

Deville

2007

Annu. Rev. Mater. Res.

603

367

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This review describes the mechanisms responsible for lowtemperature degradation (LTD) of zirconia ceramics and its detrimental consequences for biomedical devices. Special emphasis is given to the critical issue of zirconia degradation actually observed for hip prostheses. Experimental methods to accurately measure and predict LTD in a given zirconia ceramic are presented. Different solutions to inhibit LTD or at least reduce its kinetics are reviewed, with the objective of highlighting alternative options for the generation of new zirconia-based biomedical ceramic devices. 1 Annu. Rev. Mater. Res. 2007.37:1-32. Downloaded from arjournals.annualreviews.org by 195.68.31.231 on 08/06/07. For personal use only. Zirconia: zirconium dioxide (ZrO 2 ), generally used in the form of a polycrystalline technical ceramic, stabilized with another oxide Y-TZP: yttria-stabilized tetragonal zirconia polycrystal Femoral head: component of a hip prosthesis in the form of a ball affixed to a metallic femoral stem and bearing against the acetabular cup LTD: low-temperature degradation 2 Chevalier · Gremillard · Deville Annu. Rev. Mater. Res. 2007.37:1-32. Downloaded from arjournals.annualreviews.org by 195.68.31.231 on 08/06/07. For personal use only. Tetragonal-to-Monoclinic Transformation in ZirconiaThe t-m transformation in zirconia is martensitic in nature. A martensitic transformation is a "change in crystal structure . . . that is athermal, diffusionless and involves the simultaneous, cooperative movement of atoms over distances less than an atomic www.annualreviews.org • Low-Temperature Degradation of Zirconia Implants 4 Chevalier · Gremillard · Deville Annu. Rev. Mater. Res. 2007.37:1-32. Downloaded from arjournals.annualreviews.org by 195.68.31.231 on 08/06/07. For personal use only. www.annualreviews.org • Low-Temperature Degradation of Zirconia Implants 5 Annu. Rev. Mater. Res. 2007.37:1-32. Downloaded from arjournals.annualreviews.org by 195.68.31.231 on 08/06/07. For personal use only. 6 Chevalier · Gremillard · Deville Annu. Rev. Mater. Res. 2007.37:1-32. Downloaded from arjournals.annualreviews.org by 195.68.31.231 on 08/06/07. For personal use only. www.annualreviews.org • Low-Temperature Degradation of Zirconia Implants 7 Annu. Rev. Mater. Res. 2007.37:1-32. Downloaded from arjournals.annualreviews.org by 195.68.31.231 on 08/06/07. For personal use only. 8 Chevalier · Gremillard · Deville Annu. Rev. Mater. Res. 2007.37:1-32. Downloaded from arjournals.annualreviews.org by 195.68.31.231 on 08/06/07. For personal use only. www.annualreviews.org • Low-Temperature Degradation of Zirconia Implants 9 Annu. Rev. Mater. Res. 2007.37:1-32. Downloaded from arjournals.annualreviews.org by 195.68.31.231 on 08/06/07. For personal use only. 10 Chevalier · Gremillard · Deville Annu. Rev. Mater. Res. 2007.37:1-32. Downloaded from arjournals.annualreviews.org by 195.68.31.231 on 08/06/07. For personal use only. 12 Chevalier · Gremillard · Deville Annu. Rev. Mater. Res. 2007.37:1-32. Downloaded from arjournals.annualreviews.org by 1...

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Section: Influence Of Processing and Microstructure On Agingmentioning

confidence: 99%

Low-Temperature Degradation of Zirconia and Implications for Biomedical Implants

Chevalier

Grémillard

Deville

2007

Annu. Rev. Mater. Res.

603

367

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“…This means that they are composite material macroscopically anisotropic. Some investigations have shown that ceramic materials can be strengthened by incorporating small ductile metal particles [4][5][6][7][8][9]. Whereas in a traditional composite material, the composition is constant throughout its volume and its properties are homogeneous to macroscopic scale, the microstructures and properties of a FGM depend on the position in which they are determined [1,2].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Functional Materials by Means of Nitriding in Salts of Al₂O₃–Al, Al₂O₃–Ti and Al₂O₃–Fe Cermets

2009

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In this work the synthesis of functional gradient materials (FGMs) through the nitriding in salts of previously fabricated cermets is carried out. The matrix for the preparation of the FGMs is made of an Al 2 O 3 -based cermet with a fine and homogeneous dispersions of metallic particles of Al, Ti and Fe, the final content of the metallic particles in the cermets is of 10 vol. %. These materials are synthesized by powders techniques, considering as variable of study the reinforcement metal in the cermet, previous to sinter, cylindrical samples of the corresponding cermet are uniaxially compacted using 200 MPa. Subsequently, all sintered cermets are characterized by microstructural observations with the help of light microscopy. Obtained cermets are then submitted to a nitriding process by immersion in ammoniac salts. The objective is to attain a compositional gradient of metal-nitrides at the surface. This is done through a chemical reaction between the metallic particles at the cermets' surface and the nitrogen released by the ammonia salts. Functional materials are obtained such as

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Fracture Resistance of Surface-Nitrided Zirconia

Cited by 2 publications

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Low-Temperature Degradation of Zirconia and Implications for Biomedical Implants

Low-Temperature Degradation of Zirconia and Implications for Biomedical Implants

Synthesis of Functional Materials by Means of Nitriding in Salts of Al₂O₃–Al, Al₂O₃–Ti and Al₂O₃–Fe Cermets

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Fracture Resistance of Surface-Nitrided Zirconia

Cited by 2 publications

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Low-Temperature Degradation of Zirconia and Implications for Biomedical Implants

Low-Temperature Degradation of Zirconia and Implications for Biomedical Implants

Synthesis of Functional Materials by Means of Nitriding in Salts of Al2O3–Al, Al2O3–Ti and Al2O3–Fe Cermets

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Synthesis of Functional Materials by Means of Nitriding in Salts of Al₂O₃–Al, Al₂O₃–Ti and Al₂O₃–Fe Cermets