Thermal conductivity of highly porous zirconia

Naït-Ali, Benoît; Haberko, Krzysztof; Vesteghem, H.; Absi, Joseph; Smith, David Stanley

doi:10.1016/j.jeurceramsoc.2005.11.011

Cited by 244 publications

(117 citation statements)

References 18 publications

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“…The conductivity of YSZ is assumed to be more or less independent of the temperature as has been reported previously [17]. This property of YSZ has been ascribed to the high defect density.…”

Section: Accepted M Manuscriptmentioning

confidence: 89%

“…% sample. Apart from the volume percentage of the second-phase material higher order parameters, such as particle size, shape and spatial distribution, can also affect the effective conductivity [15,17]. To investigate the shape and orientation effect, we constructed certain artificial microstructures derived from the SEM determined real microstructure for the 20 vol.…”

Section: Effect Of the Porositymentioning

confidence: 99%

“…However the effect of porosity, pore shapes and its extension on the thermal conductivity of YSZ have been studied previously [15][16][17] and can be compensated for in the present experimental work. The aim of this work is to quantitatively investigate the influence of embedding MoSi 2 particles on the thermal insulating performances of YSZ.…”

Section: Introductionmentioning

confidence: 99%

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Influence of embedded MoSi2 particles on the high temperature thermal conductivity of SPS produced yttria-stabilised zirconia model thermal barrier coatings

Kulczyk-Malecka

Zhang

Carr

et al. 2016

Surface and Coatings Technology

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Influence of embedded MoSi 2 particles on the high temperature thermal conductivity of SPS produced yttria-stabilised zirconia model thermal barrier coatings, Surface & Coatings Technology (2016), doi:10.1016/j.surfcoat.2016 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A C C E P T E D Abstract:To prolong the lifetime of thermal barrier coatings (TBCs) recently a new method of microcrack healing has been developed, which relies on damage initiated thermal decomposition of embedded molybdenum disilicide (MoSi 2 ) particles within the TBC matrix.While these MoSi 2 particles have a beneficial effect on the structural stability of the TBC, the high thermal conductivity of MoSi 2 may have an unfavourable but as yet unquantified impact on the thermal conductivity of the TBCs.In this work the thermal conductivity of spark plasma sintering (SPS) produced yttria-

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Section: Accepted M Manuscriptmentioning

confidence: 89%

Section: Effect Of the Porositymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Influence of embedded MoSi2 particles on the high temperature thermal conductivity of SPS produced yttria-stabilised zirconia model thermal barrier coatings

Kulczyk-Malecka

Zhang

Carr

et al. 2016

Surface and Coatings Technology

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“…The main benefit of this type of microstructure is reduction of the residual stresses in the produced coating, higher durability, and resistance for thermal shocks, which influence the increase of the TBC lifetime (Ref 8,9). On the other hand, the fine-grained lamellar microstructure containing a great number of regularly distributed submicrometer and nanometer sized pores can significantly decrease heat transfer across coatings by decreasing their thermal conductivity (Ref 10,11).…”

Section: Introductionmentioning

confidence: 99%

Advanced Microscopic Study of Suspension Plasma-Sprayed Zirconia Coatings with Different Microstructures

et al. 2015

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The present paper is focused on the characterization of the differences between two microstructures that can be obtained using SPS technology, namely (i) columnar and (ii) two-zone microstructure including lamellas and fine unmelted particulates. The optimization of spray parameters was made, and the advanced microstructural studies of obtained coatings were performed. The work was focused on zirconia stabilized by yttria (YSZ, ZrO 2 + 14 wt.% Y 2 O 3 ) and both by yttria and ceria (YCSZ, ZrO 2 + 24 wt.% CeO 2 + 2.5 wt.% Y 2 O 3 ) which are frequently used as thermal barrier coatings. Two types of microstructure were achieved using two different plasma torches, namely SG-100 of Praxair and Triplex of Oerlikon Metco. The microstructure of prepared coatings was analyzed using scanning electron microscopy with secondary electrons detector and backscattered electrons. Energy dispersive spectroscopy was performed to analyze the chemical composition of sprayed coatings. By electron backscatter diffraction grain shape, size, and crystal orientation were determined. The analysis enabled the discussion of the coatings growth mechanism. Finally, the Shape From Shading technique was applied to recreate and to analyze 3D views of coatingsÕ topographies, and using laser confocal microscopy, the surface roughness was examined.

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“…Among various photocatalytic materials, ZrO 2 NPs have the suitable material for photocatalytic activities because of its semiconducting properties [8,11], low thermal conductivity, water insolubility, catalysis [12][13][14], and optical properties [15,16]. It is inorganic oxide, whose band gap estimates from 5 to 7 eV [17,18] depending on the phase (cubic, tetragonal, monoclinic, or amorphous) and preparation methods.…”

Section: Introductionmentioning

confidence: 99%

Untitled

2018

Indian J. Adv. Chem. Sci.

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Thermal conductivity of highly porous zirconia

Cited by 244 publications

References 18 publications

Influence of embedded MoSi2 particles on the high temperature thermal conductivity of SPS produced yttria-stabilised zirconia model thermal barrier coatings

Influence of embedded MoSi2 particles on the high temperature thermal conductivity of SPS produced yttria-stabilised zirconia model thermal barrier coatings

Advanced Microscopic Study of Suspension Plasma-Sprayed Zirconia Coatings with Different Microstructures

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