Scientists at Novosibirsk State Technical University (NSTU) have developed manganese-zinc ferrites that are not inferior in their characteristics to foreign analogues, and have also proposed the technological part necessary for the serial production of cores. The work is carried out within the framework of the strategic technological project "New Materials for Breakthrough Technologies" of the Priority 2030 program.
NSTU-NETI specialists solved the problem of import substitution of manganese-zinc ferrites, chemical compounds of iron (III) oxide Fe2o3 with oxides of other metals (Mn 1—x-y Zn x Fe y Fe2-Yo4+z), which are ferrimagnets and necessary for the production of radio electronic equipment and switching power supplies with high power density. To do this, they developed a special chemical composition, taking into account all the identified imperfections of real domestic raw materials.
"At the first stages, we developed a material whose properties fully corresponded to the world analogues of power manganese-zinc ferrites for the frequency range of alternating current from 25 to 500 kHz. We have conducted extensive scientific studies of the relationship between the composition, structure and properties of manganese-zinc ferrites, complementing the data available in the scientific literature, and applied the most advanced methods. The result is manganese—zinc ferrites, which are not inferior in their characteristics to the best foreign analogues," said Ruslan Kuzmin, project manager, Associate Professor of the Department of Materials Science in Mechanical Engineering, Candidate of Technical Sciences.
The scientists also presented the technological part necessary for the serial production of cores. According to Ruslan Kuzmin, the issue of scaling is a key one, since the main advantage of manganese-zinc ferrites compared to other magnetically soft materials is the possibility of manufacturing a wide variety of shapes and a low price, which can only be achieved through mass production of cores.
The production of domestic ferrites implies its own competitive ferrite component base, therefore, the scientists of NSTU-NETI proposed to create a scientific and technical reserve for the import-substituting production of functional ceramic materials for electrical purposes. As Ruslan Kuzmin explained, fine-grained manganese-zinc ferrites with additives have already been developed, characterized by high temperature stability of the initial magnetic permeability in the temperature range of 25-180 ° C; laboratory technological modes of obtaining materials and methods of introducing additives that ensure the formation of a homogeneous microstructure of manganese-zinc ferrites in a wide range of compositions from domestic raw materials.
"In addition, a new low-frequency power manganese—zinc ferrite has been developed with an initial magnetic permeability at 25 ° C — 3000, at 100 ° C — 5000, a maximum amplitude magnetic permeability of 6200, a magnetic induction of 500 MT and a Curie temperature of 240 ° C," Ruslan Kuzmin noted, adding that the results obtained will allow proceed to the development of a new generation of functional materials for domestic electronics.
In parallel, work is underway on new low-profile cores made of power manganese-zinc ferrites with an operating frequency of up to 2 MHz for compact power supplies.
Currently, the team is manufacturing batches of prototypes of magnetic circuits for transmission to enterprises of the radio-electronic industry.