Bochvar High-tech. Res. Inst. for Inorg. Materials

Bochvari High-tech. Res. Inst. for Inorg. Materials

Bochvar High-technology Research Institute for Inorganic Materials

Alexander Pavlovich Ponomarenko

Alexey Vladimirovich Glebov

Vladislav Konstantinovich Orlov

Sergey Igorevich Ivanov

Roman Gennadyevich Zakharov

Leonid Aleksandrovich Karpyuk

Ivan Alexandrovich Dzyubinsky

Fyodor Viktorovich Makarov

Dmitry Vladimirovich Kuznetsov

Alexander Dmitrievich Bagdatyev

Dmitry Vladimirovich Zhigalov

Alexander Pavlovich Korolev

Artem Andreevich Vorobyov

Method of manufacturing an end plug for a nuclear fuel element. The end plug includes at least two coaxial cylinders having different diameters. The end plug is configured to seal a ceramic cladding tube. The manufacturing method includes hot pressing a powder mixture comprising β-SiC, AlO, AND YO.

Method of manufacturing a nuclear fuel element end plug which contains ß-SiC, Al2O3, and Y2O3

The method includes forming an inner monolithic layer from crystals of beta phase stoichiometric silicon carbide on a carbon substrate in the form of a rod by chemical methylsilane vapor deposition in a sealed tubular hot-wall CVD reactor. The method further includes forming a central composite layer over the inner monolithic layer by twisting continuous beta phase stoichiometric silicon carbide fibers into tows, transporting the tows to a braiding machine, and forming a reinforcing thread framework. A pyrocarbon interface coating is built up by chemical methane vapor deposition in a sealed tubular hot-wall CVD reactor. Then, a matrix is formed by chemical methylsilane vapor deposition in the reactor. A protective outer monolithic layer is formed from crystals of beta phase stoichiometric silicon carbide over the central composite layer by chemical methylsilane vapor deposition in a CVD reactor. And then the carbon substrate is removed from the fabricated semi-finished product.

Method for producing ceramic multilayered tube used as cladding for fuel element in nuclear power plant

The method for producing non-core beta silicon carbide fibers includes four steps. The first step is spinning of multifilament polymeric fiber by melt-extrusion of polycarbosilane. The second step is thermooxidative cross-linking for which the produced spun polymeric fibers are cured in an oxidation furnace at a temperature of 175-250 degrees C. at a heating rate of 3-10 degrees C./h until their weight is increased by 6-15%. The third step is carbonization of the produced cured polymeric fibers with the conversion into the ceramic phase. The fourth step is finishing of the produced beta silicon carbide fiber. The effect of the invention is producing non-core silicon carbide fibers, improving their strength performance, improving resistance to high temperatures and their high creep resistance, stable fiber properties, optimal average diameter of fibers, absence of foreign impurities in the fiber composition.

Method for producing non-core beta silicon carbide fibers

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Moscow, Russia

Alexander Pavlovich Ponomarenko