Compatibility of low thermal conductivity and high infrared emissivity of plasma-sprayed Sm2Hf2O7 and Pr2Hf2O7 coatings

Huang, Yan; Dong, Shujuan; Lü, Kaiyue; Jiang, Jieqiang; Li, Neng; Gui, Li; Jiang, Jianing; Deng, Longhui; Cao, Xueqiang

doi:10.1016/j.surfcoat.2023.129312

Cited by 6 publications

(2 citation statements)

References 34 publications

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“…[13] Substantial efforts are devoted to developing high-performance thermal radiation materials, such as organic polymers, [14,15] ceramics, [16][17][18][19] glass, [20][21][22] graphene, [2,23] carbon nanotubes, [24][25][26] and transition metal oxides. [27][28][29][30] However, many of these materials suffer from inadequate IR emittance, thermal instability, or substrate-dependent behavior, thus impeding their practical utilization.Researchers have attempted to address these limitations through dual-layer radiation coatings, complex morphologies, and thermal photonics to enhance radiation capability and robustness. [3,31,32] However, these approaches tend to be costly and involve complex preparation processes, making large-scale deployment challenging.…”

Section: Introductionmentioning

confidence: 99%

High‐Entropy Engineering for Broadband Infrared Radiation

Wang

Liu

et al. 2023

Adv Funct Materials

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Developing high‐performance infrared (IR) radiation materials with desired broadband emissivity, excellent thermal stability, and scalable fabrication processes is highly desirable for energy‐saving applications and heat dissipation. However, it remains a grand challenge to concurrently meet these requirements in existing IR radiation materials. Herein, a high‐entropy (HE) approach is employed to advance the IR radiation performance of spinel oxide. This strategy efficiently narrows the bandgap due to the enhanced electron transitions and the introduction of oxygen vacancies (Ov), variable‐valence behavior, and orbital hybridization. In addition, the lattice distortion effect lowers the symmetry of lattice vibration. Therefore, the resulting HE spinel oxide exhibits near‐blackbody radiation performance, with its emissivity approximately three times higher than that of the binary spinel oxide. Moreover, the entropy‐dominating phase stabilization effect contributes to impressive thermal stability (stable at 1300 °C for 100 h). This makes it suitable for high‐temperature thermal radiation applications, such as energy conservation in industrial high‐temperature furnaces. More importantly, the HE spinel oxide can be readily spray‐coated on various substrates. And the coating on stainless steel reaches an outstanding emissivity of 0.943 in the 0.78−16 µm wavelength range. All these merits render the HE approach competitive for the development of high‐emissivity and thermally stable thermal radiation materials.

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Section: Introductionmentioning

confidence: 99%

High‐Entropy Engineering for Broadband Infrared Radiation

Wang

Liu

et al. 2023

Adv Funct Materials

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“…Researchers are developing new emerging materials, such as W coatings on carbon materials for fusion applications [5], plasma-sprayed Sm 2 Hf 2 O 7 and Pr 2 Hf 2 O 7 coatings for low thermal conductivity with high emissivity [6], Ca-Mn co-doping LaCrO 3 coatings with good mechanical properties and high emissivity for enhancing high-temperature radiant heat dissipation [7], and a high-emissivity coating on Nibased superalloy substrate [8] that may exhibit better emissivity compared to the existing commercially used materials at cryogenic temperatures and may be cost effective too. However, scarce information is available in the literature about the emissivity of these materials.…”

Section: Introductionmentioning

confidence: 99%

The development of a novel apparatus to measure the emissivity of high-roughness materials at 82 K

Dewasi,

Gangradey,

Mukherjee

et al. 2023

Meas. Sci. Technol.

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Emissivity of a material changes with temperature. The knowledge of emissivity plays an important role in the estimation of radiation heat load in cryogenic systems. As the values of emissivity of different materials at cryogenic temperature are scarcely available in literature, room temperature emissivity values are extensively used to estimate radiation heat load in a cryogenic system. This might lead to a significant deviation between the predicted and actual radiation properties at cryogenic temperature. Therefore, in the present work, an apparatus is developed based on calorimetric technique for measuring emissivity of an opaque material around 82 K. The novelties of the apparatus are compact size, ease of sample handling, lower time required to reach thermal equilibrium and most importantly, capacity to measure emissivity of a sample of high roughness. To understand the effectiveness of low and high emissivity coated heat radiators for the system, a theoretical as well as an experimental approach has been followed. It is found that the high emissive heat radiator led to a significant reduction in the time required to reach the thermal equilibrium as compared to a low-emissive heat radiator. To verify and validate this setup, emissivity of the Aeroglaze Z306 (high emissivity) and Cu (low emissivity) is measured and compared with the values reported in the literature. Finally, the work has been extended to measure emissivity at cryogenic temperature for the first time for PU1, SG121FD, and the indigenously developed novel materials such as black paints, adhesive and activated charcoals of different granule sizes.

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Improvement on properties of Sr2+ doped perovskite-type ceramic for thermal protective coating: A comprehensive evaluation

Xu,

Chen,

et al. 2024

Ceramics International

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Compatibility of low thermal conductivity and high infrared emissivity of plasma-sprayed Sm2Hf2O7 and Pr2Hf2O7 coatings

Cited by 6 publications

References 34 publications

High‐Entropy Engineering for Broadband Infrared Radiation

High‐Entropy Engineering for Broadband Infrared Radiation

The development of a novel apparatus to measure the emissivity of high-roughness materials at 82 K

Improvement on properties of Sr2+ doped perovskite-type ceramic for thermal protective coating: A comprehensive evaluation

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