Role of H2O on the degradation process of Y-TZP

Yoshimura, Masahiro; Noma, Tatsuo; Kawabata, Katsuichi; Sōmiya, Shigeyuki

doi:10.1007/bf01756800

Cited by 315 publications

(211 citation statements)

References 6 publications

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“…12,[29][30][31][32][33][34][35] Among the models, a model proposed by Guo seems to be most commonly accepted. 34,35) That model consists of the following steps: (i) chemical À into the inner part by grain boundary diffusion, (vi) filling of oxygen vacancies by OH ions, and therefore the formation of proton defects, and (v) occurrence of a tetragonal to monoclinic transformation when the oxygen vacancy concentration is reduced to the extent that the tetragonal phase is no longer stable.…”

Section: Resultsmentioning

confidence: 99%

“…It has been shown that tetragonal to monoclinic (t-m) transformation at the surface of zirconia ceramics is accelerated by the presence of water molecules in the environment. [11][12][13][14] Since the t-m transformation involves volume increase, it induces the formation of microcracks at the surface and an increase of the roughness. Microcracking leads to a decrease of the mechanical properties; this phenomenon is called low temperature degradation of zirconia, which could explain the failure of implants after several years in vivo.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Small Amount of Insoluble Dopant on Tetragonal to Monoclinic Phase Transformation in Tetragonal Zirconia Polycrystal

et al. 2009

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The effect of small amount of insoluble dopant on tetragonal to monoclinic (t-m) phase transformation of 3 mol%Y 2 O 3 stabilized tetragonal zirconia polycrystal (3Y-TZP) is examined by ageing in hot water. The materials used are 3Y-TZP and 0.1 mol%SiO 2 -doped 3Y-TZP with grain size of 0.55 mm. The t-m phase transformation of 3Y-TZP is retarded by 0.1 mol%SiO 2 doping. Since the doped silicon ion segregates along the grain boundaries, the change in phase transformation behavior must be originated from the change in grain boundary diffusivity of hydroxyl ion. Analysis of the transformation kinetics by the Mehl-Avrami-Johnson equation reveals that the activation energy does not change in the two materials but the pre-exponential term significantly changes. Grain boundary diffusion of hydroxyl ion must be blocked by the presence of silicon ion which reduces the effective area of grain boundary diffusion.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Small Amount of Insoluble Dopant on Tetragonal to Monoclinic Phase Transformation in Tetragonal Zirconia Polycrystal

et al. 2009

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“…11,[27][28][29][30][31][32][33] Among the models, a model proposed by Guo seems to be most commonly accepted. 32,33) That model consists of the following steps: (i) chemical adsorption of H 2 O on the ZrO 2 surface, (ii) reaction of H 2 O with O 2À on the ZrO 2 surface to form hydroxyl ions OH À , (iii) penetration of OH À into the inner part by grain boundary diffusion, (vi) filling of oxygen vacancies by OH ions, and therefore the formation of proton defects, and (v) occurrence of a tetragonal to monoclinic transformation when the oxygen vacancy concentration is reduced to the extent that the tetragonal phase is no longer stable.…”

Section: Resultsmentioning

confidence: 99%

“…It has been shown that tetragonal to monoclinic (t-m) transformation at the surface of zirconia ceramics is accelerated by the presence of water molecules in the environment. [10][11][12][13] Since the t-m transformation involves volume increase, it induces the formation of microcracks at the surface and an increase of the roughness. Microcracking leads to a decrease of the mechanical properties; this phenomenon is called low temperature degradation of zirconia, which could explain the failure of implants after several years in vivo.…”

Section: Introductionmentioning

confidence: 99%

Effect of Titania Doping on Phase Stability of Zirconia Bioceramics in Hot Water

2007

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The effect of titania doping on tetragonal to monoclinic (t-m) phase transformation of zirconia bioceramics is evaluated by ageing in hot water at 413 K. The examined materials are 3 mol%Y 2 O 3 stabilized tetragonal zirconia polycrystal (3Y-TZP) and 1.5, 3.0 and 7.7 mol%TiO 2 -doped 3Y-TZP. The t-m phase transformation of 3Y-TZP is accelerated by titania doping in all the specimen examined. However, 7.7 mol%TiO 2 -doped TZP shows better phase stability than 1.5 or 3.0 mol%TiO 2 -doped one. This change in phase stability of 7.7 mol%TiO 2 -doped TZP cannot be simply explained from the difference of grain size or the change in the axial ratio, c=a. XRD analysis reveals that the distance between nearest neighbor anion and cation site significantly decreases only in 7.7 mol%TiO 2 -doped TZP. This result indicates that the binding energy between dopant and oxygen vacancy affects the phase stability as well as the change in the axial ratio, c=a.

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“…Zirconias are well-known materials fabricated in several varieties. One of these varieties is Y-TZP [23][24][25][26][27]. Some of the properties of the material have been described (e.g.…”

Section: Introductionmentioning

confidence: 99%

Wear and friction of Y-TZP spheres reciprocating against various sialon plates

Berg

Dortmans

Kokmeijer

et al. 1993

JOURNAL OF MATERIALS SCIENCE

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The friction and wear characteristics of various Y-TZP-sialon sliding systems were examined. These systems consisted of a Y-TZP sphere reciprocating against various sialon plates. The sialons differed in phase content and composition. They range from cz-sialons to 13-sialons and include 0~-13 composites. The length of the wear tracks was 10 mm, the loads used were 2 and 8 N, the frequencies 1,4 and 8 Hz and the humidity was controlled by flushing with dry nitrogen. The tests were continued for 8, 24 and 72 h at room temperature. The total vertical displacement and the friction coefficient were measured continuously and sampled. Various additional measurements were performed after each test and the worn surfaces were observed microscopically. It was concluded that the :z-J3 composites show less wear than the 0~-and 13-sialons. It was also concluded that the amount of wear increases approximately linearly with load and increases significantly more than linearly with frequency. A wear mechanism was derived incorporating the measured data and the observations.

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Role of H2O on the degradation process of Y-TZP

Cited by 315 publications

References 6 publications

Effect of Small Amount of Insoluble Dopant on Tetragonal to Monoclinic Phase Transformation in Tetragonal Zirconia Polycrystal

Effect of Small Amount of Insoluble Dopant on Tetragonal to Monoclinic Phase Transformation in Tetragonal Zirconia Polycrystal

Effect of Titania Doping on Phase Stability of Zirconia Bioceramics in Hot Water

Wear and friction of Y-TZP spheres reciprocating against various sialon plates

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