Phase relationships in the zirconia-yttria system

Scott, H. G.

doi:10.1007/bf01031853

Cited by 1,207 publications

(560 citation statements)

References 9 publications

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“…34,35 The martensitic transition from the monoclinic to the high-temperature tetragonal phase at 1200°-1300°C exhibited by both types of powders is also observed in conventional bulk zirconia. 22,36 Partial transformation to m-ZrO 2 occurs between 1000°-1100°C and 500°-600°C in both the emulsion and sol-gelderived powders, respectively. According to Eq.…”

Section: August 2004 Nanostructured Dense Zro 2 Thin Films From Nanopmentioning

confidence: 99%

Nanostructured Dense ZrO₂ Thin Films from Nanoparticles Obtained by Emulsion Precipitation

Woudenberg¹,

Sager²,

Elshof³

et al. 2004

Journal of the American Ceramic Society

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Nonagglomerated spherical ZrO 2 particles of 5-8 nm size were made by emulsion precipitation. Their crystallization and film-forming characteristics were investigated and compared with nanosized ZrO 2 powders obtained by sol-gel precipitation. High-temperature X-ray diffraction indicated that the emulsion-derived particles are amorphous and crystallize at 500°C into tetragonal zirconia, which is stable up to 1000°C. Crystallite growth from 5-20 nm occurred between 500°-900°C. Films of 6 -75 nm thickness were made by spreading, spin coating, and controlled deposition techniques and annealed at 500°-600°C. The occurrence of t-ZrO 2 in the emulsion-precipitated powder is explained by the low degree of agglomeration and the corresponding low coarsening on heating to 500°-800°C, whereas the agglomerated state of the sol-gel precipitate powder favors the occurrence of the monoclinic form of zirconia under similar conditions.

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Section: August 2004 Nanostructured Dense Zro 2 Thin Films From Nanopmentioning

confidence: 99%

Nanostructured Dense ZrO₂ Thin Films from Nanoparticles Obtained by Emulsion Precipitation

Woudenberg¹,

Sager²,

Elshof³

et al. 2004

Journal of the American Ceramic Society

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show abstract

“…The t′ reverts into the equilibrium tetragonal t and cubic c phases during high temperature exposures. However the cation-diffusion controlled transformation is found to be sluggish at temperatures below 1200°C [14]. In contrast to the t′ phase, the equilibrium phase t which results from a very slow approach to phase equilibration, undergoes the t-m transformation that limits the lifetime of the TBCs.…”

Section: Phase Determination Of the Ceramic Coating Via Xrdmentioning

confidence: 99%

Air plasma sprayed thermal barrier coatings on titanium alloy substrates

Zhou

et al. 2007

Surface and Coatings Technology

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Titanium alloys as lightweight structure materials have been shown more interest in the use at moderately elevated temperatures. However, their poor oxidation resistance at temperature above 600°C limits a wide application. Consequently, thermal protection becomes a concern. 8 wt. % yttria partially stabilized zirconia thermal barrier coatings (TBCs) were air plasma sprayed on titanium alloy substrates (Ti-6.6Al-3.61Mo-1.69Zr-0.28Si in wt.%). The microstructures and mechanical properties of the coating system were studied by using SEM, XRD, MIP, tensile test and Vickers microhardness. The results show that the as-sprayed ceramic coating consists of the non-transformable tetragonal t′ phase of zirconia. The microstructure of the internal substrate keeps unchanged, no reaction and interdiffusion happen obviously at the bond coat/substrate interface during plasma spraying. However, there exists a thin layer of plastic deformation zone in the substrate beneath the bond coat/substrate interface. The surface connected porosity of the as-sprayed ceramic coating shows a typical bimodal pore size distribution. The adhesive strength of the TBCs decreases with increasing the thickness of the as-sprayed ceramic coatings, which is attributed to the residual stresses induced during thermal spraying. The anisotropy in the mechanical properties between the cross section and the top surface of the ceramic coatings is examined.

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“…The vaporization of the binder increased porosity, but sintering eliminated the pores and increased implant density due to diffusion. Sintering at 1350°C produced an implant density of 5.70 g/cm 3 , while that of implants which did not undergo de-binding and sintering was 3.45 g/cm 3 .…”

Section: Analysis Of Sintering Processmentioning

confidence: 99%

“…Figure 8 shows the density measurement results. Implant density was lower in implants sintered at temperatures below 1400°C (5.23 g/cm 3 at 1200°C and 5.55 g/cm 3 at 1300°C) due to insufficient densification. At sintering temperatures above 1400°C, the implants' relative density of implants was nearly 99% of the theoretical value.…”

Section: Properties Analysismentioning

confidence: 99%

See 1 more Smart Citation

Effect of Injection Molding and Sintering Behaviors on Y-TZP Dental Implants

Yang¹,

Chen²

2016

J Phys Chem Biophys

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Phase relationships in the zirconia-yttria system

Cited by 1,207 publications

References 9 publications

Nanostructured Dense ZrO₂ Thin Films from Nanoparticles Obtained by Emulsion Precipitation

Nanostructured Dense ZrO₂ Thin Films from Nanoparticles Obtained by Emulsion Precipitation

Air plasma sprayed thermal barrier coatings on titanium alloy substrates

Effect of Injection Molding and Sintering Behaviors on Y-TZP Dental Implants

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Phase relationships in the zirconia-yttria system

Cited by 1,207 publications

References 9 publications

Nanostructured Dense ZrO2 Thin Films from Nanoparticles Obtained by Emulsion Precipitation

Nanostructured Dense ZrO2 Thin Films from Nanoparticles Obtained by Emulsion Precipitation

Air plasma sprayed thermal barrier coatings on titanium alloy substrates

Effect of Injection Molding and Sintering Behaviors on Y-TZP Dental Implants

Contact Info

Product

Resources

About

Nanostructured Dense ZrO₂ Thin Films from Nanoparticles Obtained by Emulsion Precipitation

Nanostructured Dense ZrO₂ Thin Films from Nanoparticles Obtained by Emulsion Precipitation