Журналы →  Tsvetnye Metally →  2012 →  №9 →  Назад

COMPOZITES AND MULTIPURPOZE COATINGS
Название Сorrosion kinetics of intermetallic compounds of nickel and aluminum in fluorine-containing environment in the presence of oxygen
Автор Andreev G. G., Permyakov O. E., Guzeeva T. I.
Информация об авторе

Tomsk Polytechnic University, Tomsk, Russia:

G. G. Andreev, Professor

T. I. Guzeeva, Professor, e-mail: guzeev@mail.tomsknet.ru

Federal University of Educational Development, Moscow, Russia:

O. E. Permyakov, Chief Specialist

Реферат

Production of uranium hexafluoride by direct fluorination of uranium oxides with elemental fluorine has three main stages: fluorination of uranium oxides with elemental fluorine in a flame reactor, desublimation of uranium hexafluoride, and capture of excess fluoride at a fresh portion of uranium oxide in the catcher device. Necessity to clean the reaction gases is related to their high dustiness after devices for fluorination and capturing and requirements to the purity of uranium hexafluoride. Corrosiveness of these gases containing fluorine, oxygen, hydrogen fluoride and uranium hexafluoride is very high. Traditional filtering materials presenting of copper and nickel meshes, metal-ceramic nickel corrode with high speed at a high temperature of exploitation. New filtering materials based on nickelide of aluminium have been obtained by high-temperature self-extending synthesis. The paper presents the results of research of corrosion kinetics of porous intermetallic compounds of nickel and aluminium in fluorine-oxygen environment. Studies of the corrosion kinetics were performed by the comparative method using standard samples of the metal-ceramic filter made of different compositions of nickel and nickelide of aluminium: Ni3Al; NiAl; Ni2Al3; NiAl3. The dependences of the degree of corrosion of nickelides of aluminium in fluorine at the temperature of 480–500 оС and in oxygen at the temperature of 850–900 оС, as well as in hydrogen fluoride at 480–500 оС and uranum hexafluoride at 680–700 оС are presented. Nickelide of aluminium are found to belong to the first group of stability in fluorine (up to 500 оС) and oxygen (up to 900 оС). Minimal degree of corrosion under the indicated conditions has NiAl. This is explained by ability of NiAl to maintain the ordered state of the crystal lattice to the melting point (1911 оС). The samples of NiAl were tested on corrosion resistance and mechanical strength at the Siberian Chemical Industrial Complex.

Ключевые слова Filtration, fluorine, uranium hexafluoride, hydrogen fluoride, the ceramic-metal filter, nikelid of aluminum
Библиографический список

1. Permyakov O. E. Korroziya poristykh filtrov (SVS) na osnove nikelida alyuminiya v gazakh proizvodstva geksaftorida urana : dissertatsiya … kandidata tekhnicheskikh nauk (Corrosion of depth filters (SHS) on the basis of the aluminium nickelide in the gases of uranium hexafluoride production : dissertation … of Candidate of Engineering Sciences). Tomsk : Tomsk Polytechnic University, 1987. 172 p.
2. Spravochnik po korrozionnoy i khimicheskoy stoykosti materialov (Reference book on the corrosion and chemical resistance of materials). Under the general editorship of N. A. Dol lezhal. Moscow : Mashgiz, 1954. 450 p.
3. Pavlovskaya E. I., Shibryaev B. F. Metallokeramicheskie filtry (Metal ceramic filters). Moscow : Nedra, 1967. 245 p.
4. Idzumi O. Kinzoku. 1984. Vol. 54, No. 10. pp. 1–5.
5. Andreev G. G., Permyakov O. E., Guzeeva T. I. Razrabotka tekhnologii izgotovleniya SVS-filtrov iz intermetallidov nikelya i alyuminiya (Development of production technology of SHS-filters from the intermetallic compounds of nickel and aluminium). Vestnik nauki Sibiri — Information of a Syberian Science. No. 1. Available at : http://news.tpu.ru/news/2011/09/27/989-viy_elektronniy_nauchniy_zhurnal.html.
6. Andreev G. G., Kurin N. P., Permyakov O. E. Termodinamika korrozii intermetallidov nikel-alyuminiy vo ftore, ftorovodorode i kislorode (Thermodynamics of a nickel-aluminium intermetallic compounds in fluorine, hydrogen fluoride and oxygen). Samorasprostranyayushchiysya vysokotemperaturnyy sintez (Self-spreading high-temperature synthesis). Under the editorship of Yu. M. Maksimov. Tomsk : Tomsk State University Publ., 1991. 198 p.
7. Boldyrev V. V. Metody izucheniya kinetiki termicheskogo razlozheniya tverdykh veshchestv (Research approaches of a kinetics of a thermal decomposition of solid substances). Tomsk : Tomsk State University Publ., 1958. 331 p.

Language of full-text русский
Полный текст статьи Получить
Назад