Intrinsic connections between thermionic emission cooling effect and emission characteristics of W-La2O3 cathodes at high temperatures

Wei Liang; Songhe Meng; Qingxuan Zeng; Xinxing Han

doi:10.1016/j.matlet.2021.131172

Intrinsic connections between thermionic emission cooling effect and emission characteristics of W-La₂O₃ cathodes at high temperatures

Wei Liang
, Songhe Meng^*
, Qingxuan Zeng
, Xinxing Han

^*Corresponding author for this work

School of Astronautics

Harbin Institute of Technology

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

We investigated the effect and mechanism of the emission characteristics on the thermionic emission cooling (TEC) effect using the prepared W-La₂O₃ cathode in the temperature range of 2050–2350 °C. The experimental and calculated results showed that the TEC effect and the current density of cathodes increased non-linearly with temperature. Under high temperatures, the initial velocity of emission electrons provides a significant contribution to improving the TEC effect. The emission current flow patterns corresponding to the cathodic emission characteristic region under operating conditions determine the magnitude and trend of the TEC effect, which can be well interpreted by the high-temperature thermionic emission (HTTE) model.

Original language	English
Article number	131172
Journal	Materials Letters
Volume	308
DOIs	https://doi.org/10.1016/j.matlet.2021.131172
State	Published - 1 Feb 2022

Keywords

High-temperature thermal protection
Metallic composites
Thermal properties
Thermionic emission characteristics
Thermionic emission cooling

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10.1016/j.matlet.2021.131172

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@article{a611e0e47c744aa0886aaf5cc0aa97bf,

title = "Intrinsic connections between thermionic emission cooling effect and emission characteristics of W-La2O3 cathodes at high temperatures",

abstract = "We investigated the effect and mechanism of the emission characteristics on the thermionic emission cooling (TEC) effect using the prepared W-La2O3 cathode in the temperature range of 2050–2350 °C. The experimental and calculated results showed that the TEC effect and the current density of cathodes increased non-linearly with temperature. Under high temperatures, the initial velocity of emission electrons provides a significant contribution to improving the TEC effect. The emission current flow patterns corresponding to the cathodic emission characteristic region under operating conditions determine the magnitude and trend of the TEC effect, which can be well interpreted by the high-temperature thermionic emission (HTTE) model.",

keywords = "High-temperature thermal protection, Metallic composites, Thermal properties, Thermionic emission characteristics, Thermionic emission cooling",

author = "Wei Liang and Songhe Meng and Qingxuan Zeng and Xinxing Han",

note = "Publisher Copyright: {\textcopyright} 2021 Elsevier B.V.",

year = "2022",

month = feb,

day = "1",

doi = "10.1016/j.matlet.2021.131172",

language = "英语",

volume = "308",

journal = "Materials Letters",

issn = "0167-577X",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Intrinsic connections between thermionic emission cooling effect and emission characteristics of W-La2O3 cathodes at high temperatures

AU - Liang, Wei

AU - Meng, Songhe

AU - Zeng, Qingxuan

AU - Han, Xinxing

PY - 2022/2/1

Y1 - 2022/2/1

N2 - We investigated the effect and mechanism of the emission characteristics on the thermionic emission cooling (TEC) effect using the prepared W-La2O3 cathode in the temperature range of 2050–2350 °C. The experimental and calculated results showed that the TEC effect and the current density of cathodes increased non-linearly with temperature. Under high temperatures, the initial velocity of emission electrons provides a significant contribution to improving the TEC effect. The emission current flow patterns corresponding to the cathodic emission characteristic region under operating conditions determine the magnitude and trend of the TEC effect, which can be well interpreted by the high-temperature thermionic emission (HTTE) model.

AB - We investigated the effect and mechanism of the emission characteristics on the thermionic emission cooling (TEC) effect using the prepared W-La2O3 cathode in the temperature range of 2050–2350 °C. The experimental and calculated results showed that the TEC effect and the current density of cathodes increased non-linearly with temperature. Under high temperatures, the initial velocity of emission electrons provides a significant contribution to improving the TEC effect. The emission current flow patterns corresponding to the cathodic emission characteristic region under operating conditions determine the magnitude and trend of the TEC effect, which can be well interpreted by the high-temperature thermionic emission (HTTE) model.

KW - High-temperature thermal protection

KW - Metallic composites

KW - Thermal properties

KW - Thermionic emission characteristics

KW - Thermionic emission cooling

UR - https://www.scopus.com/pages/publications/85118583073

U2 - 10.1016/j.matlet.2021.131172

DO - 10.1016/j.matlet.2021.131172

M3 - 文章

AN - SCOPUS:85118583073

SN - 0167-577X

VL - 308

JO - Materials Letters

JF - Materials Letters

M1 - 131172

ER -

Intrinsic connections between thermionic emission cooling effect and emission characteristics of W-La₂O₃ cathodes at high temperatures

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Keywords

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