EDN: RIRHND
Authors & Affiliations
Yarygin V.I., Тulin S.M.
A.I. Leypunsky Institute for Physics and Power Engineering, Obninsk, Russia
Yarygin V.I. – Chief Researcher, Dr. Sci. (Tech.), Professor. 1, pl. Bondarenko, Obninsk, Kaluga region, Russia, 249033. Tel.: +7 (484) 399-88-29; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..
TulinS.M. – Lead Engineer.
Abstract
The article discusses the experimental results of the research by complex methods of analyzing the properties of the surface, near-surface region and emission-adsorption characteristics in the interelectrode medium of the TIC of the behavior of platinum deposited on W [111] in the form of a film with a thickness of ~3 microns. Discussion of experimental results is carried out within the framework of a consistent physical model of platinum modification of tungsten tungsten single crystal polyhedral gas-phase emission coating W [111] on cylindrical TIC emitters with axial crystallographic orientation [111].
The experimental results described in the article showed that W[111] coatings modified with a platinum film have the following properties:
– platinum forms a near-surface tungsten-platinum alloy in areas with “loose” type (121)-faces and with defective areas in the process of simultaneous surface diffusion of platinum from areas with orientation along the (110)-facet in the area of “loose” faces and volume diffusion platinum into the near-surface regions of “loose” faces;
– tungsten-platinum alloy in the near-surface regions of single-crystal polyhedral tungsten emission coatings ensures their emission homogeneity, corresponding to the vacuum work function of electrons ~5.2 eV and remaining in vacuum and the interelectrode medium of TIC up to a temperature not lower than ~2000 K.
Keywords
thermionic converter, electrode materials, emitter, single-crystal tungsten, platinum, work function of electrons, slow electron diffraction, electron auger spectroscopy
Article Text (PDF, in Russian)
References
1. Yarygin V.I. Yadernaya energetika pryamogo preobrazovaniya v kosmicheskikh missiyakh XXI v. [Nuclear power of direct conversion in space missions of the XXI century]. Izvestiya vuzov. Yadernaya energetika, 2013, no.&bnbsp;2, pp. 5–23.
2. Yarygin V.I., Ruzhnikov V.A., Sinyavskiy V.V. Kosmicheskiye i nazemnyye yadernyye energeticheskiye ustanovki pryamogo preobrazovaniya energii [Space and Terrestrial Nuclear Power Plants for Direct Energy Conversion. Monograph]. Moscow, NRNU MEPHI Publ., 2016, 364 p.
3. Yarygin V.I. Elektrodnyye materialy termoemissionnykh preobrazovateley energetiche-skikh ustanovok razlichnogo naznacheniya. Avtoreferat Diss. dokt. tekh. nauk [Electrode materials of thermionic converters of power plants for various purposes. Dr. tech. sci. diss. abstract]. Obninsk, 1999.
4. Yarygin V.I., Tulin S.M. Fizicheskaya model' rabochey poverkhnosti effektivnogo kollektora termoemissionnogo preobrazovatelya. [Physical model of the working surface of the effective collector of thermionic converter]. Voprosy atomnoy nauki i tekhniki. Seriya: Yaderno-reaktornyye konstanty – Problems of Atomic Science and Technology. Series: Nuclear and Reactor Constants, 2022, no.&bnbsp;3, pp. 197–205.
5. Tekhnologiya termoemissionnykh preobrazovateley (spravochnik). Pod red. S.V. Ryabikova. [Technology of thermionic converters (handbook). Ed. S.V. Ryabikova]. Moscow, Atomizdat Publ., 1974, 232 p.
6. Sidelnikov V.N. O roli emissii elektronov s kollektora termoemissinnogo preobrazovaniya [On the role of electron emission from a thermionic conversion collector]. Zhurnal tekhnicheskoy fiziki – Journal of Technical Physics, 1983, no.&bnbsp;3, pp. 385–390.
7. Vybyvanets V.I., Gontar A.S., Eremin S.A. et al. Bazovyy elektrogeneriruyushchiy kanal dvukhrezhimnykh termoemissionnykh YAEU. Nauchno-tekhnicheskiye problemy razrabotki i sozdaniya. [Basic thermionic fuel element of dual-mode thermionic nuclear power plants. Scientific and technical problems of development and co-building]. Plenary report in the proceedings of the International Conference “Nuclear Power Engineering in Space – 2005”, Moscow – Podolsk, March 1–3, 2005.
8. Yarygin V.I. Fizicheskiye osnovy termoemissionnogo preobrazovaniya energii. Chast' 2. Metody issledovaniya, tekhnika izmereniy kharakteristik i ispytaniy elektrodnykh materialov. Uchebnoye posobiye [Physical foundations of thermionic energy conversion. Part 2. Research methods, technique for measuring characteristics and testing of electrode materials. Textbook]. Obninsk, IATE Publ., 2006, 64 p.
9. Yarygin V.I. Fizicheskiye osnovy termoemissionnogo preobrazovaniya energii. Chast' 1. Vvedeniye v spetsial'nost'. Uchebnoye posobiye [Physical foundations of thermionic energy conversion. Part 1. Introduction to the specialty. Textbook]. Obninsk, IATE Publ., 2006, 104 p.
UDC 621.311:621.039
Problems of Atomic Science and Technology. Series: Nuclear and Reactor Constants, 2023, no. 1, 1:16
