Physicochemical Structure of Carburized Thoriated Tungsten and Its Effect on Thermionic Emission

被引：0

作者：

Velazquez, Daniel ^{[1
]}

Ohlinger, Wayne ^{[2
]}

Vancil, Bernard ^{[3
]}

Smith, Frank ^{[3
]}

Riordan, Brian ^{[1
]}

Langtry, Robin ^{[1
]}

机构：

[1] Avalanche Energy, 9100 E Marginal Way S, Seattle, WA 98108 USA

[2] POB 506, Babson Pk, FL 33827 USA

[3] eBeam Inc, 21070 SW Tile Flat Rd, Beaverton, OR 97007 USA

来源：

E-JOURNAL OF SURFACE SCIENCE AND NANOTECHNOLOGY | 2024年 / 22卷 / 03期

关键词：

Fusion reactor; Thermionic emitter; Thoriated tungsten; Space-charge mitigation; Work function; THORIUM;

D O I：

10.1380/ejssnt.2024-022283

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The work presented here aims to optimize parameters for emission current and lifetime based on thermionic, microstructural and chemical characterization. Carburization was performed using toluene in a test structure consisting of a straight 0.006-inch diameter 2% thoria-tungsten wire, tensioned with a leaf spring and concentric to the inner diameter of a 1-inch long, 0.250-inch diameter molybdenum tube serving as the anode for emission testing. Scanning electron microscope/energy dispersive spectroscopy analysis shows the formation of a similar to 5 mu m carburization layer, while thermionic measurements show improved emission over uncarburized thoriated tungsten.

引用

页码：283 / 286

页数：4

共 50 条

[11] Field emission from tungsten and thoriated tungsten single crystals
Daniel, JH
PHYSICAL REVIEW, 1942, 61 (9/10): : 657 - 667
[12] Emission of positive ions from thoriated tungsten
Wahlin, HB
PHYSICAL REVIEW, 1930, 35 (06): : 0653 - 0653
[13] The electron emission from thoriated tungsten filaments
Langmuir, I
PHYSICAL REVIEW, 1923, 22 (04): : 0357 - 0398
[14] RATE OF EVAPORATION OF THORIUM FROM CARBURIZED THORIATED TUNGSTEN CATHODES MEASURED BY ACTIVATION ANALYSIS
SCHMIED, H
DEAK, M
BRITISH JOURNAL OF APPLIED PHYSICS, 1965, 16 (02): : 269 - &
[15] ELECTRON AND ION EMISSION OF THORIATED TUNGSTEN IN SODIUM VAPOURS
DOBRETZOV, LN
ZHURNAL EKSPERIMENTALNOI I TEORETICHESKOI FIZIKI, 1947, 17 (04): : 301 - 314
[16] EFFECT OF THERMAL AND ULTRAVIOLET RADIATION ON THERMIONIC EMISSION FROM TUNGSTEN
STICKNEY, RE
SUN, PB
SHAW, ML
JOURNAL OF APPLIED PHYSICS, 1966, 37 (06) : 2391 - &
[17] THERMIONIC EMISSION PROPERTIES OF TUNGSTEN OXIDE
ZANDBERG, EY
RASULEV, UK
SOVIET PHYSICS TECHNICAL PHYSICS-USSR, 1969, 13 (10): : 1446 - +
[18] Observations on the field emission cathode and the atomization of thoriated tungsten.
Mueller, Erwin W.
ZEITSCHRIFT FUR PHYSIK, 1937, 106 (01): : 132 - 140
[19] On the cause of the loss of thermionic activity of thoriated tungsten filaments under certain voltage conditions.
Davies, AC
Moss, RN
PHILOSOPHICAL MAGAZINE, 1928, 5 (31): : 989 - 1010
[20] Thermionic emission, migration, and evaporation of barium on tungsten
Becker, JA
Moore, GE
PHILOSOPHICAL MAGAZINE, 1940, 19 (193): : 129 - 139

← 1 2 3 4 5 →