At the Tomsk Scientific Center of the Siberian Branch of the Russian Academy of Sciences, the service life of porous metal burners for power plants, capable of withstanding temperatures above 1000 °C, has been increased up to five times. This was reported in the press service of the Ministry of Education and Science of the Russian Federation.
Porous products are mainly manufactured using powder technologies, but in Russia, metal powders with microconcentrations of rare earth elements (REE) are practically unavailable. Researchers have proposed special equipment for modifying available commercial powders.
The processing was carried out in the chamber of an electron beam installation. Using magnetron sputtering, a thin layer of rare earth element was applied to the surface of the powder particles. Then, under the influence of an electron beam, the coatings were connected to the material of the particles.
As a result, a powder alloy of the "core-shell" type was obtained, where the "cores" are aluminum and chromium powders, and the "shells" are dysprosium and yttrium.
The resulting master alloys were used to obtain porous intermetallics by the method of self-propagating high-temperature synthesis (SHS). This process can be compared to the burning of a large Bengal candle: a mixture of nickel, aluminum and master alloy powders is able to slowly burn at temperatures above 1,500-1,600°C with the formation of porous structures.
Earlier www1.ru reported that a high-strength aluminum-based alloy was developed in Moscow.
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