Effects of rare-earth oxide doping on the thermal radiation performance of HfO2 coating

Liu, Fusheng; Mao, Jiawei; Li, Qingyu; Zeng, Xian

doi:10.1016/j.ceramint.2019.03.230

Cited by 26 publications

(9 citation statements)

References 33 publications

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“…The authors observed that the fluorite phases RE 2 Hf 2 O 7 (RE = Tb, Gd, and Sm) demonstrated higher IR total emittance values (0.851–0.883) than pure HfO 2 (0.621–0.659) at temperatures ranging from to 1600°C. The authors 71 did not clarify here whether they took the directional distribution of the radiation into account when measuring the emittance values. It is understood that, at higher temperatures, the defective fluorite lattice structure facilitated a strong lattice vibration and electronic transfer, promoting absorptions in the materials in the IR band.…”

Section: Radiative Properties Of Uhtcmentioning

confidence: 99%

“…Liu et al 71 . studied the effect of REO doping in improving the emittance of HfO 2, considering HfO 2 as an alternative to boride‐based UHTC using radiometric emissometry.…”

Section: Radiative Properties Of Uhtcmentioning

confidence: 99%

“…Additionally, the RE ions introduced localized intermediate energy levels that allowed the transition of electrons between valence and conduction bands resulting in enhanced absorption. The authors 71 also noted that some RE ions could migrate into interstitial sites of HfO 2 , which could lead to a large degree of lattice distortion, increased phonon‐photon radiation, and increased lattice absorption. Tb 4 O 7 ‐HfO 2 coating demonstrated relatively higher IR emissivity than those of Gd 2 O 3 ‐HfO 2 and Sm 2 O 3 ‐HfO 2 owing to the increased vibrational frequency of the Tb‐O bond and the transformation of Tb ions in the lattice.…”

Section: Radiative Properties Of Uhtcmentioning

confidence: 99%

See 2 more Smart Citations

Radiation heat transfer during hypersonic flight: A review of emissivity measurement and enhancement approaches of ultra‐high temperature ceramics

Saad

Martínez

Trice

2023

Int J Ceramic Engine & Sci

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Emissivity as a function of wavelength, direction, and temperature correlates to a material's efficiency in radiating thermal energy. Knowledge of emissivity is essential for designing and developing radiation-cooled thermal protective systems for hypersonic applications. It is desirable to achieve a high emissivity (with a value close to 1) to maximize heat radiation from a hot surface of a hypersonic vehicle's leading edge during atmospheric re-entry. With the goal of providing the hypersonic materials community with this necessary knowledge, this article offers a basic understanding of thermal radiation, methods for measuring emissivity at high temperatures, and a comprehensive overview of the emissivity of ultra-high temperature ceramics.

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Section: Radiative Properties Of Uhtcmentioning

confidence: 99%

“…Liu et al 71 . studied the effect of REO doping in improving the emittance of HfO 2, considering HfO 2 as an alternative to boride‐based UHTC using radiometric emissometry.…”

Section: Radiative Properties Of Uhtcmentioning

confidence: 99%

Section: Radiative Properties Of Uhtcmentioning

confidence: 99%

See 1 more Smart Citation

Radiation heat transfer during hypersonic flight: A review of emissivity measurement and enhancement approaches of ultra‐high temperature ceramics

Saad

Martínez

Trice

2023

Int J Ceramic Engine & Sci

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“…The introduction of RE elements can endow HfO 2 NPs with the additional functionalities in fluorescence imaging and magnetic resonance imaging (MRI). [39,58,59] For example, Falcony et al synthesized HfO 2 NPs doped with different concentrations of trivalent samarium (Sm 3+ ) to obtain HfO 2 :Sm 3+ through hydrothermal method followed by post-annealed in an air atmosphere at different temperatures. The Sm 3+ concentration and annealed temperature determined the crystal structures of the resulting phosphors.…”

Section: Metal Elements-doped Hfomentioning

confidence: 99%

Harnessing Hafnium‐Based Nanomaterials for Cancer Diagnosis and Therapy

Ding

Chen

Liao

et al. 2023

Small

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With the rapid development of nanotechnology and nanomedicine, there are great interests in employing nanomaterials to improve the efficiency of disease diagnosis and treatment. The clinical translation of hafnium oxide (HfO2), commercially namedas NBTXR3, as a new kind of nanoradiosensitizer for radiotherapy (RT) of cancers has aroused extensive interest in researches on Hf‐based nanomaterials for biomedical application. In the past 20 years, Hf‐based nanomaterials have emerged as potential and important nanomedicine for computed tomography (CT)‐involved bioimaging and RT‐associated cancer treatment due to their excellent electronic structures and intrinsic physiochemical properties. In this review, a bibliometric analysis method is employed to summarize the progress on the synthesis technology of various Hf‐based nanomaterials, including HfO2, HfO2‐based compounds, and Hf‐organic ligand coordination hybrids, such as metal‐organic frameworks or nanoscaled coordination polymers. Moreover, current states in the application of Hf‐based CT‐involved contrasts for tissue imaging or cancer diagnosis are reviewed in detail. Importantly, the recent advances in Hf‐based nanomaterials‐mediated radiosensitization and synergistic RT with other current mainstream treatments are also generalized. Finally, current challenges and future perspectives of Hf‐based nanomaterials with a view to maximize their great potential in the research of translational medicine are also discussed.

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“…Currently, many technologies have been proposed to raise the efficiency of industrial furnaces, and it has been found that the enhancement of heat transfer in the heating process within furnaces is an efficient way of improving the furnaces' efficiency [5]. In this respect, an infrared radiation coating was developed and applied to the surface of the inner walls of furnaces, and this is now widely used in industry [6]. The infrared radiation coating enhances the emissivity of the furnaces' inner wall, and the radiation transfer is thus strengthened between the heated materials and the furnaces' wall [7].…”

Section: Introductionmentioning

confidence: 99%

A Novel Optimization Model and Application of Optimal Formula Design for CuxCo1−xFe2O4 Spinel-Based Coating Slurry in Relation to Near and Middle Infrared Radiation Strengthening

Zhang

et al. 2020

Materials

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Coating slurry, in which the infrared radiation material is the main content, is applied in industrial furnaces to improve heat transfer and raise efficiency of furnaces. In this study, a Cu x Co 1 − x Fe 2 O 4 series material with a spinel structure was prepared, and the emissivity of different formulas in two wavebands (3–5 μm and 8–14 μm) was measured. To ensure that the material delivered high emissivity, optimization models were proposed using Matlab software, and proportions of CuO, Co2O3 and Fe2O3 were found to be 16.98%, 16.73% and 66.29%, respectively, in the optimal formula. Thus, using the Cu x Co 1 − x Fe 2 O 4 series material and additives, according to mixture regression method, fifteen formulas of coating slurry were designed, prepared and the emissivities were measured. With the Matlab software optimization model, the content of coating slurry was optimized and the corresponding emissivities were measured to be 0.931 and 0.905 in two wavebands, which is in agreement with the optimized calculation.

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Effects of rare-earth oxide doping on the thermal radiation performance of HfO2 coating

Cited by 26 publications

References 33 publications

Radiation heat transfer during hypersonic flight: A review of emissivity measurement and enhancement approaches of ultra‐high temperature ceramics

Radiation heat transfer during hypersonic flight: A review of emissivity measurement and enhancement approaches of ultra‐high temperature ceramics

Harnessing Hafnium‐Based Nanomaterials for Cancer Diagnosis and Therapy

A Novel Optimization Model and Application of Optimal Formula Design for CuxCo1−xFe2O4 Spinel-Based Coating Slurry in Relation to Near and Middle Infrared Radiation Strengthening

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