Minimized thermal conductivity in highly stable thermal barrier W/ZrO2 multilayers

Döring, Florian; Major, Anna; Eberl, Christian; Krebs, Hans‐Ulrich

doi:10.1007/s00339-016-0405-0

Cited by 6 publications

(8 citation statements)

References 22 publications

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“…The samples were grown by Pulsed-Laser-Deposition. Automatized control of the deposition system enabled us to deposit a large number of 50 MgO-ZrO 2 bilayers, as already described elsewhere 28 . In sample SL1 (SL2), each MgO and ZrO 2 layer has a thickness of 10 nm (5 nm).…”

Section: Methodsmentioning

confidence: 99%

Spectral control of elastic dynamics in metallic nano-cavities

Ulrichs

Meyer

Döring

et al. 2017

Sci Rep

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We show how the elastic response of metallic nano-cavities can be tailored by tuning the interplay with an underlying phononic superlattice. In particular, we exploit ultrafast optical excitation in order to address a resonance mode in a tungsten thin film, grown on top of a periodic MgO/ZrO2 multilayer. Setting up a simple theoretical model, we can explain our findings by the coupling of the resonance in the tungsten to an evanescent surface mode of the superlattice. To demonstrate a second potential benefit of our findings besides characterization of elastic properties of multilayer samples, we show by micromagnetic simulation how a similar structure can be utilized for magneto-elastic excitation of exchange-dominated spin waves.

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Section: Methodsmentioning

confidence: 99%

Spectral control of elastic dynamics in metallic nano-cavities

Ulrichs

Meyer

Döring

et al. 2017

Sci Rep

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“…In the multilayer nanofilms structure, thermal conductivity will dramatically decrease because the phonon propagation is hindered via large number of interface. For example, the thermal conductivity of W/ZrO 2 multilayers system can be decreased to 1 W/mK compared to that of individual components [89]. Therefore, these nanofilm could be applied in thermal barrier coating.…”

Section: Nanofilm Tungsten Containing Non-metal Layers For Radiation Resistancementioning

confidence: 99%

Recent progress of radiation response in nanostructured tungsten for nuclear application

Pei

et al. 2021

Tungsten

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Engineering materials for nuclear reactors exposed to high-dose irradiation breed various radiation damage, leading to performance degradation of materials, which seriously limits the application of materials in the future advanced nuclear reactors. Tungsten-based materials applied in future nuclear reactors have to withstand not only the attack of high-energy neutron and plasma, but also the repeated impact of steady-state or even transient thermal load. Researches in the past decades have proved that tailored nanostructure have advantage in annihilating radiation defects. With the rapid development of nanostructured tungsten, probing radiation application of nanostructured tungsten is of great significance in promoting the development of novel radiation-resistant materials. Herein, the development status of three kinds of nanostructured tungsten namely nanocrystalline, nanofilm and nanoporous tungsten designed for radiation tolerance and the performance enhancement mechanism of diverse nanostructure in irradiation environment is reviewed. Finally, future perspectives and technical challenges are discussed, to inspire more creative designs of novel nanostructured tungsten for radiation tolerance.

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“…Heterogeneous materials could in principle be used for spacers if they offer much lower thermal conductance than the least conducting uniform materials, such as amorphous solids, which typically have k ~1 Wm −1 K −1 10,11 . Nanolaminates can reach a conductivity of k ~0.1 Wm −1 K −1 , significantly below the conductivity of the constituent alternating nano-meter thin layers 12–16 . Aerogels, with their ultralow density and nanoscale porosity, provide even lower conductivities of 0.01–0.03 Wm −1 K −1 in vacuum 17–23 .…”

Section: Introductionmentioning

confidence: 97%

Micron-gap spacers with ultrahigh thermal resistance and mechanical robustness for direct energy conversion

et al. 2019

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In thermionic energy converters, the absolute efficiency can be increased up to 40% if space-charge losses are eliminated by using a sub-10-µm gap between the electrodes. One practical way to achieve such small gaps over large device areas is to use a stiff and thermally insulating spacer between the two electrodes. We report on the design, fabrication and characterization of thin-film alumina-based spacers that provided robust 3–8 μm gaps between planar substrates and had effective thermal conductivities less than those of aerogels. The spacers were fabricated on silicon molds and, after release, could be manually transferred onto any substrate. In large-scale compression testing, they sustained compressive stresses of 0.4–4 MPa without fracture. Experimentally, the thermal conductance was 10–30 mWcm−2K−1 and, surprisingly, independent of film thickness (100–800 nm) and spacer height. To explain this independence, we developed a model that includes the pressure-dependent conductance of locally distributed asperities and sparse contact points throughout the spacer structure, indicating that only 0.1–0.5% of the spacer-electrode interface was conducting heat. Our spacers show remarkable functionality over multiple length scales, providing insulating micrometer gaps over centimeter areas using nanoscale films. These innovations can be applied to other technologies requiring high thermal resistance in small spaces, such as thermophotovoltaic converters, insulation for spacecraft and cryogenic devices.

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Minimized thermal conductivity in highly stable thermal barrier W/ZrO2 multilayers

Cited by 6 publications

References 22 publications

Spectral control of elastic dynamics in metallic nano-cavities

Spectral control of elastic dynamics in metallic nano-cavities

Recent progress of radiation response in nanostructured tungsten for nuclear application

Micron-gap spacers with ultrahigh thermal resistance and mechanical robustness for direct energy conversion

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