Processing and Characterization of Yttria-Stabilized Zirconia Foams for High-Temperature Applications

Herrera, Ana María Trejos; Oliveira, Amir Antônio Martins; Oliveira, Antônio Pedro Novaes de; Hotza, Dachamir

doi:10.1155/2013/785210

Cited by 10 publications

(4 citation statements)

References 26 publications

(35 reference statements)

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“…There are three thermodynamically stable crystalline phases of ZrO 2 under atmospheric pressure: monoclinic, tetragonal, and cubic [120][121][122][123][124]. Among all these crystalline phases, the cubic phase has good thermal, mechanical, and electrical properties [125,126].…”

Section: Methods Of Preparation Of Zro 2 Nanoparticlesmentioning

confidence: 99%

The Effect of Addition of Nanoparticles, Especially ZrO2-Based, on Tribological Behavior of Lubricants

Rylski

Siczek

2020

Lubricants

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The aim of the paper was to discuss different effects, such as, among others, agglomeration of selected nanoparticles, particularly those from zirconia, on the tribological behavior of lubricants. The explanation of the difference between the concepts of ‘aggregation’ and ‘agglomeration’ for ZrO2 nanoparticles is included. The factors that influence such an agglomeration are considered. Classification and thickeners of grease, the role of additives therein, and characteristics of the lithium grease with and without ZrO2 additive are discussed in the paper. The role of nanoparticles, including those from ZrO2 utilized as additives to lubricants, particularly to the lithium grease, is also discussed. The methods of preparation of ZrO2 nanoparticles are described in the paper. The agglomeration of ZrO2 nanoparticles and methods to prevent it and the lubrication mechanism of the lithium nanogrease and its tribological evaluation are also discussed. Sample preparation and a ball-on disc tester for investigating of spinning friction are described. The effect of ZrO2 nanoparticles agglomeration on the frictional properties of the lithium grease is shown. The addition of 1 wt.% ZrO2 nanoparticles to pure lithium grease can decrease the friction coefficient to 50%. On the other hand, the agglomeration of ZrO2 nanoparticles in the lithium grease can increase twice the friction coefficient relative to that for the pure grease.

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Section: Methods Of Preparation Of Zro 2 Nanoparticlesmentioning

confidence: 99%

The Effect of Addition of Nanoparticles, Especially ZrO2-Based, on Tribological Behavior of Lubricants

Rylski

Siczek

2020

Lubricants

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“…Our observation is apparently similar to the electrostatically driven formation of multiple layers of Zn 2+ adsorption near the surface of muscovite (001), 17 but it could have also been caused by a different mechanism. The point of zero charge (PZC) of powder averaged 8 mol % YSZ is known to be near pH = 7−9, 18 which can cause slightly positive-charged or neutral surface at pH = 7, and Zn 2+ adsorption will bias the surface charge toward positive. Therefore, we cannot rule out the possibility of coadsorption of acetate counterion in this region, which may contribute to the total electron density profile.…”

Section: ■ Discussionmentioning

confidence: 99%

Zinc Adsorption and Hydration Structures at Yttria-Stabilized Zirconia Surfaces

Hou

Kim

et al. 2017

J. Phys. Chem. C

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Zinc adsorption and interfacial hydration on yttria-stabilized zirconia (YSZ) surfaces in contact with aqueous zinc solutions at room temperature and neutral pH have been probed with combined specular high-resolution X-ray reflectivity and element-specific (Zn) resonant anomalous X-ray reflectivity techniques. The total and partial zinc-specific electron density profiles in the surface normal direction show the detailed interfacial hydration structures with zinc adsorption. Strongly depending on its crystallographic orientations, the YSZ (110) surface adsorbs zinc species only within adsorbed water layers above the terminal plane, while on (111) surface, zinc further penetrates the substrate (below the terminal plane). Considering that both surfaces are enriched with oxygen vacancies and metal-depleted sites, on which chemisorbed water species are expected, the observed contrast indicates that specific zinc adsorption is controlled strongly by the intrinsic surface chemistry that results from orientation-dependent interfacial structures.

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“…Thus yttrium stabilized zirconia (YSZ), allows metastable tetragonal and cubic phases to be stable at lower temperatures with enhanced mechanical, thermal and electrical properties (Herrera et al 2013). Table 1 depicts the chemical composition of the stainless steel 17-4PH according to manufacturer's specification while Figure 1(b) indicates the obtained results from XRD analysis.…”

Section: °Cmentioning

confidence: 99%

Two Component Injection Moulding of Bi-material of Stainless Steel and Yttria Stabilized Zirconia – Green Part

Emeka¹,

Sulong²,

Muhamad³

et al. 2017

JKUKM

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Processing and Characterization of Yttria-Stabilized Zirconia Foams for High-Temperature Applications

Cited by 10 publications

References 26 publications

The Effect of Addition of Nanoparticles, Especially ZrO2-Based, on Tribological Behavior of Lubricants

The Effect of Addition of Nanoparticles, Especially ZrO2-Based, on Tribological Behavior of Lubricants

Zinc Adsorption and Hydration Structures at Yttria-Stabilized Zirconia Surfaces

Two Component Injection Moulding of Bi-material of Stainless Steel and Yttria Stabilized Zirconia – Green Part

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