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Articles

dx.doi.org/ 10.18577/2307-6046-2024-0-5-3-12

УДК 621.791

Afanasiev-Khodykin A.N., Galushka I.A., Sviridov A.V., Naprienko S.A.

INVESTIGATION OF THE INFLUENCE OF TECHNOLOGICAL PARAMETERS OF HEAT TREATMENT ON MICROSTRUCTURE OF BRAZING JOINTS OF VT20 ALLOY WITH VPr16 SOLDER

The results of investigation of the influence of the assembly gap width on the microstructure of brazing joints of pseudo-α-alloy VT20 with VPr16 solder are presented. The soldered samples after brazing and subsequent homogenization heat treatment (HHT) are analyzed. The main types of microstructures formed in the solder joint are identified and regression equations of the influence of the gap width and duration of the HHT on the main transition points of the solder joint microstructure are constructed. The dynamics of change of alloying elements (aluminum, zirconium, copper and nickel) in the solder joint and diffusion zone has been studied. The optimum microstructure is selected, which does not have a boundary in the center of the seam and boundaries of the junction of crystals.

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Reference list

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dx.doi.org/ 10.18577/2307-6046-2024-0-5-13-24

УДК 678.83

Zhelezina G.F., Kulagina G.S., Kan A.Ch., Startsev V.O.

RESISTANCE OF ARAMID ORGANIC PLASTICS TO THE EFFECTS OF NATURAL ENVIRONMENT FACTORS

The climatic aging of aramid organic plastics in various natural environments is investigated. It is shown that the climatic stability of organic plastics is at the level of resistance of polymeric composite materials reinforced by carbon fibers and fiber glasses, despite the higher water absorption. Organic plastic Organit 10Т has 71 % of tensile strength properties after 18 years of climatic aging. Organic plastics can recover their properties after removal (drying) of the sorbed moisture. Organic plastics from new Rusar-NT fiber and epoxy melt binders have the biggest resistance to climatic aging.

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Reference list

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24. Vasilyeva E.D., Vasilyeva A.A., Kychkin A.K. On the question of methods for studying the effects of moisture on polymer composite materials. Materialovedenie. Energetika, 2022, vol. 28, no. 1, pp. 21–31. DOI: 10.18721/JEST.28102.
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dx.doi.org/ 10.18577/2307-6046-2024-0-5-25-36

УДК 669.058

Aleksandrov D.A., Benklyan A.S.

EROSION-RESISTANT AND CORROSION-RESISTANT COATINGS TO PROTECT COMPRESSOR PARTS OF GAS TURBINE ENGINES

General information is provided on the most commonly used and promising erosion-resistant and corrosion-resistant ion-plasma coatings for the protection of gas turbine engine parts. A brief analysis of the main methods of applying protective coatings to parts of the gas turbine engine compressor is carried out. The strengths and weaknesses of the coatings used are shown, as well as some properties such as erosion and corrosion resistance and operating temperature. The main development trends in the field of erosion-corrosion-resistant ion-plasma coatings are considered. The issues of the peculiarities of applying protective coatings to large-sized parts of the gas turbine engine compressor are discussed.

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Reference list

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25. Physical vapour deposition process for depositing erosion resistant coatings on a substrate: pat. CA2600097; appl. 31.08.07; publ. 28.02.09.
26. Aleksandrov D.A., Doronin O.N., Zhuravleva P.L., Benklyan A.S. The research of erosion-corrosion-resistant coatings for protection of titanium impellers for helicopter gas-turbine engine. Trudy VIAM, 2023, no. 8 (126), paper no. 08. Available at: http://www.viam-works.ru (accessed: March 10, 2024). DOI: 10.18577/2307-6046-2023-0-9-90-100.
27. Budinovskiy S.A., Lyapin A.A., Gorlov D.S., Benklyan A.S., Tatarnikov S.V. Multilayer antifretting coating on large-sized manufactures. Aviation materials and technologies, 2022, no. 3 (68), paper no. 09. Available at: http://www.journal.viam.ru (accessed: March 10, 2024). DOI: 10.18577/2713-0193-2022-0-3-98-107.
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dx.doi.org/ 10.18577/2307-6046-2024-0-5-37-49

УДК 620.179

Krasnov I.S., M.A. Dalin, Zarodova A.A., Yakovleva S.I., Verhodanova A.A.

A AUTOMATED ULTRASONIC INSPECTION OF TITANIUM ALLOY GAS TURBINE DISC FORGINGS USING CONICAL ACOUSTIC MIRROR

Acoustic conical mirror for high sensitivity ultrasonic inspection of titanium alloy complex shape forging was offered and developed. Its geometrical parameters were calculated using mathematical modelling. The correction coefficients which are needed for compensation of the curved input surface influence were calculated. The high accuracy of the calculation was confirmed. The use of an acoustic mirror allowed increasing the sensitivity of inspection by more than 12 dB (4 times).

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Reference list

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12. Kablov E.N. Innovative developments of FSUE «VIAM» SSC of RF on realization of «Strategic directions of the development of materials and technologies of their processing for the period until 2030». Aviacionnye materialy i tehnologii, 2015, no. 1 (34), pp. 3–33. DOI: 10.18577/2071-9140-2015-0-1-3-33.
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14. DOT/FAA/AR-05/29. Inspection Development for Nickel Billet–Engine Titanium Consortium Phase II. Washington, DC: Department of Transportation Federal Aviation Administration, 2005, рр. 3–21.
15. Karpelson A. Bi-curved Ultrasonic Transducers. The e-Journal of Nondestructive Testing, 2006, vol. 11, no. 5. Available at: https://www.ndt.net/article/v11n05/karpelson/karpelson.htm (accessed: November 13, 2023).
16. AMS2636 Rev. A. Ultrasonic Immersion Inspection Titanium and Titanium Alloy Forgings Premium Grade. New York, NY: SAE, 2016, 16 р.

dx.doi.org/ 10.18577/2307-6046-2024-0-5-50-60

УДК 620.79

Kochubey A.Ya., Medvedev P.N., Juravleva P.L.

APPLICATION OF X-RAY DIFFRACTOMETRY FOR RESEARCHING STRUCTURAL FORMATION PROCESSES DURING THE HOT PRESSURE WORKING AND HEAT TREATMENT OF DEFORMED METALS AND ALLOYS

The possibilities of using direct pole figures (DPF) are analyzed for researching structural formation processes during heating of cold worked metals and also at hot deformation. It is shown that acceleration and automation of DPF plotting allows to significantly increase the efficiency and reduce the duration of research. It is shown that the application of DPF is productive not only for studying the process of transition of metallic materials to deformation texture but also inverse processes. This method is tested for aviation metal alloys.

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Reference list

1. Borodkina M.M., Spektor E.N. X-ray analysis of the texture of metals and alloys. Moscow: Metallurgy, 1981, 272 p.
2. Gorelik S.S., Skakov Yu.A., Rastorguev L.N. X-ray and electron-optical analysis: textbook for universities; 4th ed. add. and proc. Moscow: MISIS, 2002, 360 p.
3. Kablov E.N., Antipov V.V. The role of new generation materials in ensuring the technological sovereignty of the Russian Federation. Vestnik Rossiyskoy akademii nauk, 2023, vol. 93, no. 10, рр. 907–916.
4. Kablov E.N., Antipov V.V., Yakovlev N.O., Kulikov V.V., Avtaeva Ya.V., Avtaev V.V., Medvedev P.N. Effect of the temperature and anisotropy of sheets from Al–Cu–Mg–Li system on the mechanical properties in the range of small plastic strains. Industrial Laboratory. Materials Diagnostics, 2022, vol. 88, no. 11, рр. 55–65.
5. Kablov E.N., Nechaikina T.A., Somov A.V., Ivanov A.L., Murzabaeva O.Yu. The influence of heat treatment on the structure and properties of pressed semi-finished products from the promising super-strong aluminum alloy V-1977. Metallovedenie i termicheskaya obrabotka metallov, 2023, no. 1 (811), pp. 28–33.
6. Oglodkov M.S., Romanenko V.A., Benarieb I., Rudchenko A.S., Grigoryev M.V. Study of industrial semi-finished products from advanced aluminum-lithium alloys for aircraft products. Aviation materials and technologies, 2023, no. 3 (72), paper no. 05. Available at: http://www.journal.viam.ru (accessed: March 04, 2024). DOI: 10.18577/2713-0193-2023-0-3-62-77.
7. Echin A.B., Bondarenko Yu.A., Kolodyazhny M.Yu., Surova V.A. Review of perspective high-temperature superalloys based on refractory non-metallic materials for production of gas turbine engines. Aviation materials and technologies, 2023, no. 3 (72), paper no. 03. Available at: http://www.journal.viam.ru (accessed: March 04, 2024). DOI: 10.18577/2713-0193-2023-0-3-30-411.
8. Sbitneva S.V., Lukina E.А., Benarieb I. Some structural features of aluminum alloys obtained by selective laser melting (review). Trudy VIAM, 2023, no. 1 (119), paper no. 06. Available at: http://www.viam-works.ru (accessed: March 04, 2024). DOI: 10.18577/2307-6046-2023-0-1-69-83.
9. Lukina E.A., Naprienko S.A., Gorbovets M.A., Zaitsev D.V., Oglodkova Yu.S. Changes in the structural and phase state of cold-formed semi-finished products from Al–Li- alloys after various low-temperature effects. Trudy VIAM, 2023, no. 1 (119), paper no. 04. Available at: http://www.viam-works.ru (accessed: March 04, 2024). DOI: 10.18577/2307-6046-2023-0-1-39-49.
10. Bondarenko Yu.A. Trends in the development of high-temperature metal materials and technologies in the production of modern aircraft gas turbine engines. Aviacionnye materialy i tehnologii, 2019, no. 2 (55), pp. 3–11. DOI: 10.18577/2071-9140-2019-0-2-3-11.
11. Kochubey A.Ya., Medvedev P.N., Klochkov G.G., Avtaev V.V. Patterns of texture formation during flat upsetting of an alloy of the Al–Cu–Li system. Tekhnologiya legkikh splavov, 2016, no. 1, pp. 78–87.
12. Kochubey A.Ya., Zhuravleva P.L. X-rays diffractometry application at plotting of structure conditions diagrams of deformable alloys of aviation assignment. Trudy VIAM, 2022, no. 2 (108), paper no. 12. Available at: http://www.viam-works.ru (accessed: March 04, 2024). DOI: 10.18577/2307-6046-2022-0-2-142-152.
13. Kochubey A.Ya., Zhuravleva P.L. Diagrams of textural states of heat-resistant nickel and magnesium alloys during hot axisymmetric upsetting. Novosti materialovedeniya. Nauka i tekhnika, 2018, no. 1–2, art. 03. Available at: http://materialsnews.ru (accessed: March 04, 2024).
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16. Fridlyander I.N., Grushko O.E., Antipov V.V., Kolobnev N.I., Khokhlatova L.B. Aluminum-lithium alloys. 75 years. Aviation materials. Selected works of «VIAM» 1932–2007. Moscow: VIAM, 2007, pp. 309−314.
17. Milevskaya T.V., Ruschits S.V., Tkachenko E.A., Antonov S.M. Deformation behavior of high-strength aluminum alloys in conditions of hot deformation. Aviacionnye materialy i tehnologii, 2015, no. 2 (35), pp. 3–9. DOI: 10.18577/2071-9140-2015-0-2-3-9.
18. Antipov V.V., Senatorova O.G., Tkachenko E.A., Vahromov R.O. Aluminum deformable alloys. Aviacionnye materialy i tehnologii, 2012, no. S, pp. 167–182.
19. Vainblat Yu.M. Diagrams of structural states and maps of structures of aluminum alloys. Izvestiya AN SSSR. Metally, 1982, no. 2, pp. 82–89.
20. Treninkov I.A., Zavodov A.V., Petrushin N.V. Research of crystal structure and microstructure of the ZhS32-VI nickel-base superalloy synthesized by selective laser fusion method, after high-temperature mechanical tests. Aviacionnye materialy i tehnologii, 2019, no. 1 (54), pp. 57–65. DOI: 10.18577/2071-9140-2019-0-1-57-65.

dx.doi.org/ 10.18577/2307-6046-2024-0-5-61-70

УДК 621.891

Sevostyanov N.V., Budanova E.S.

PATTERNS OF FRICTION OF GRAPHITE AND BORON NITRIDE WITH MATERIALS OF DIFFERENT TYPES AT LOW SPEEDS

The research presents the results of experimental determination of friction coefficient and linear wear at rubbing of graphite and boron nitride in the friction pair with materials of different types (steel 95X18, bronze BrAZh9-4, fluoroplastic F-4, polyamide PA-6, graphite MPG-7and hard alloy VK-8) under conditions of low speeds. It was found that the friction of polymers in pairing with layered solid lubricants is determined by tribotechnical properties of the polymer. The friction coefficient of layered solid-lubricating materials paired with metallic materials is determined by the quality of the forming adhesive ordered lubricating layer on the metal surface.

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Reference list

1. Karabasov Yu.S., Chernousov P.I., Korotchenko N.A., Golubev O.V. Metallurgy and time: encyclopedia in 4 vols. Moscow: MISiS, 2011, vol. 1: Fundamentals of the profession. The ancient world and the early Middle Ages, 216 p.
2. Sevostyanov N.V., Burkovskaya N.P. Modern aspects tribotechnical materials science of heavy-loaded dry friction units the development (review). Trudy VIAM, 2022, no. 10 (116), paper no. 07. Available at: http://www.viam-works.ru (accessed: January16, 2024). DOI: 10.18577/2307-6046-2022-0-10-76-89.
3. Kablov E.N., Kulagina G.S., Zhelezina G.F., Lonskii S.L., Kurshev E.V. Microstructure research of the unidirectional organoplastic based on Rusar-NT aramid fibers and epoxy-polysulfone binder. Aviacionnye materialy i tehnologii, 2020, no. 4 (61), pp. 19–26. DOI: 10.18577/2071-9140-2020-0-4-19-26.
4. Kobzev D.E., Baronin G.S., Dmitriev V.M. et al. Intensification of solid-phase plunger extrusion of nanomodified high-density polyethylene by ultrasonic influence. Materialovedenie, 2012, no. 4, pp. 37–40.
5. Shanfu Lu, Ruijie Xiu, Xin Xu et al. Polytetrafluoroethylene (PTFE) reinforced poly (ethersulphone)–poly (vinyl pyrrolidone) composite membrane for high temperature proton exchange membrane fuel cells. Journal of Membrane Science, 2014, vol. 464, pp. 1–7. DOI: 10.1016/j.memsci.2014.03.053.
6. Ghalmi Z., Farzaneh M. Durability of nanostructured coatings based on PTFE nanoparticles deposited on porous aluminum alloy. Applied Surface Science, 2014, vol. 314, pp. 564–569. DOI: 10.1016/j.apsusc.2014.05.194.
7. Burkovskaya N.P., Sevostyanov N.V., Bolsunovskaya T.A., Efimochkin I.Yu. Improvement of materials for sliding bearings of internal combustion engines (review). Trudy VIAM, 2020, no. 1, paper no. 08. Available at: http://www.viam-works.ru (accessed: January 16, 2024). DOI: 10.18577/2307-6046-2020-0-1-78-91.
8. Ilyushchenko A.F., Leshok A.V., Dyachkova L.N. et al. Features of the influence of pencil graphite and elemental graphite on the tribological properties of copper-based friction material operating under boundary friction conditions. Powder Metallurgy. Minsk: Publ. House «Belarusian Science», 2019, pp. 65–58.
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10. Ryashentsev D.S., Belenkov E.A. New polymorphic varieties of boron nitride with graphene-like structures. Radioelektronika. Nanosistemy. Informatsionnye tekhnologii, 2021, no. 13 (3), pp. 349–354. DOI: 10.17725/rensit.2021.13.349.
11. Zhivushkin A.A., Kozlova E.A., Chubukov I.A., Marova A.Yu. Features of the use of the composite material «Aluminum – boron nitride» in aircraft engines. Vestnik Samarskogo gosudarstvennogo aerokosmicheskogo universiteta im. akademika S.P. Koroleva (NIU), 2009, no. 3 (19), pp. 235–240.
12. Negrov D.A., Eremin E.N., Korusenko P.M., Nesov S.N. The influence of ultrasonic activation on the structure formation of polytetrafluoroethylene modified with boron nitride. Omsk Scientific Bulletin. Ser.: Aviation, missile and power engineering, 2017, vol. 1, no. 2, pp. 57–63.
13. Kablov E.N. Innovative developments of FSUE «VIAM» SSC of RF on realization of «Strategic directions of the development of materials and technologies of their processing for the period until 2030». Aviacionnye materialy i tehnologii, 2015, no. 1 (34), pp. 3–33. DOI: 10.18577/2071-9140-2015-0-1-3-33.
14. Kablov E.N. Composites: today and tomorrow. Metally Evrazii, 2015, no. 1, pp. 36–39.
15. Raskutin A.E. Russian polymer composite materials of new generation, their exploitation and implementation in advanced developed constructions. Aviacionnye materialy i tehnologii, 2017, no. S, pp. 349–367. DOI: 10.18577/2071-9140-2017-0-S-349-367.
16. Burkovskaya N.P., Sevostyanov N.V. Cermets for plain bearings (review). Trudy VIAM, 2023, no. 3 (121), paper no. 08. Available at: http://www.viam-works.ru (accessed: January 16, 2024). DOI: 10.18577/2307-6046-2023-0-3-84-94.
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dx.doi.org/ 10.18577/2307-6046-2024-0-5-71-82

УДК 620.1:678.8

Laptev A.B., Pavlov M.R., Zeleneva T.O.

LIGHT SOURCES FOR SIMULATING THE AGING OF POLYMER MATERIALS UNDER THE INFLUENCE OF SOLAR RADIATION

A step-by-step analysis of the ultraviolet spectrum was carried out. It is shown that UV-B and UV-C light are present on the Earth's surface in small doses. UV-A light on the Earth's surface has significant doses leading to photolysis and destruction of heteroorganic polymers. In order to conduct research by simulating light aging, it is necessary to simulate solar radiation in the range from 290 nm (UV-B) with a set of LED radiation sources that fully correspond to the spectral composition and power of Sunlight on the Earth's surface.

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Reference list

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2. Kablov E.N. New generation materials and digital technologies for their processing. Vestnik Rossiyskoy akademii nauk, 2020, vol. 90, no. 4, pp. 331–334.
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4. Laptev A.B., Pavlov M.R., Novikov A.A., Slavin A.V. Current trends in the development of testing materials for resistance to climate factors (review). Part 1. Testing of new materials. Trudy VIAM, 2021, no. 1 (95), paper no. 12. Available at: http://www.viam-works.ru (accessed: November 20, 2023). DOI: 10.18577/2307-6046-2021-0-1-114-122.
5. Laptev A.B., Pavlov M.R., Novikov A.A., Slavin A.V. Current trends in the development of testing materials for resistance to climatic factors (review). Part 2. Main trends. Trudy VIAM, 2021, no. 2 (96), paper no. 11. Available at: http://www.viam-works.ru (accessed: November 20, 2023). DOI: 10.18577/2307-6046-2021-0-2-99-108.
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9. Chesnokova T.Yu., Voronina Yu.V., Chentsov A.V. et al. Calculation of solar radiation fluxes in the UV range with different absorption cross sections of ozone and nitrogen dioxide. Matematicheskaya fizika i kompyuternoe modelirovanie, 2017, vol. 20, no. 5, pp. 76–88.
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21. Whiteside M., Herndon J.M. Destruction of stratospheric ozone: Role of aerosolized coal fly ash iron. European Journal of Applied Sciences, 2022, vol. 10 (4), pp. 143–153.
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27. Istamov F., Dadomatov X., Boboev T. Influence of tensile load on the kinetics of photodestruction of polymethyl methacrylate. Doklady Akademii nauk Respubliki Tadzhikistan, 2002, vol. 45, no. 10, pp. 76–80.
28. Berlin A.A., Korolev G.V., Kefeli T.Ya., Severgin Yu.M. Acrylic oligomers and materials based on them. Moscow: Nauka, 1983, 320 p.
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dx.doi.org/ 10.18577/2307-6046-2024-0-5-83-90

УДК 543.2

Prokopova L.A., Golovina E.Yu., Ponomarenko S.A.

METHODS FOR DETERMINING THE MASS FRACTION OF HEXAMINE IN THE CATALYST FU

The paper presents a comparative study of methods for determining the mass fraction of hexamine in samples of the «catalyst FU» using manual and instrumental approaches. The work describes the principles and stages of each method and analyzes their advantages and disadvantages. Statistics of the results of determining the composition of the product by three methods are presented. Based on the results obtained, a method for determining the mass fraction of urotropin has been proposed, which makes it possible to increase the accuracy and efficiency of the analysis.

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Reference list

1. Kablov E.N., Semenova L.V., Petrova G.N., Larionov S.A., Perfilova D.N. Polymer composite materials on a thermoplastic matrix. Izvestiya vuzov. Khimiya i khimicheskaya tekhnologiya, 2016, vol. 59, is. 10, pp. 61–71.
2. Kablov E.N. The role of chemistry in the creation of new generation materials for complex technical systems. Report XX Mendeleev Congress on General and Applied Chemistry. Ekaterinburg: Ural Branch of the Russian Academy of Sciences, 2016, pp. 25–26.
3. Kablov E.N., Chursova L.V., Babin A.N., Mukhametov R.R., Panina N.N. Developments of FSUE «VIAM» in the field of melt binders for polymer composite materials. Polimernye materialy i tekhnologii, 2016, vol. 2, no. 2, pp. 37−42.
4. Chernin I.Z., Smekhov F.M., Zherdev Yu.V. Epoxy polymers and compositions. Moscow: Khimiya, 1982, 232 p.
5. Khorova E.A., Myshlyavtsev A.V., Strizhak E.A., Tretyakova N.A. Examination of hydrogenated butadiene-nitrile rubbers by methods of differential scanning calorimetry and dynamic mechanical analysis. Aviacionnye materialy i tehnologii, 2019, no. 1 (54), pp. 11–16. DOI: 10.18577/2071-9140-2019-0-1-11-16.
6. Кhorova E.A., Tretyakova N.A., Vakulov N.V. Research of resistance of rubbers to the exposure of mold fungi. Aviation materials and technologies, 2021, no. 3 (64), paper no. 12. Available at: http://www.journal.viam.ru (accessed: December 12, 2023). DOI: 10.18577/2713-0193-2021-0-3-128-132.
7. Kuznetsova V.А. Influence of the elastomeric modifier on mechanical and viscoelastic properties of epoxy and rubber compositions for erosion resistant coatings. Aviacionnye materialy i tehnologii, 2020, no. 2 (59), pp. 56–62. DOI: 10.18577/2071-9140-2020-0-2-56-62.
8. Mukhametov R.R., Petrova A.P. Thermosetting binders for polymer composites (review). Aviacionnye materialy i tehnologii, 2019, no. 3 (56), pp. 48–58. DOI: 10.18577/2071-9140-2019-0-3-48-58.
9. Andrianov R.A., Ponomarev Yu.E. Foams based on phenol-formaldehyde polymers. Rostov: Publ. house Rostov State Univ., 1987, 80 p.
10. Vorobyov V.A. Polymer technology. Moscow: Vysshaya shkola, 1980, 303 p.
11. Guben-Weil. Methods of organic chemistry: in 2 vols. Moscow: Khimiya, 1967, vol. 2: Methods of analysis, 1032 p.
12. Siggia S., Hannah J.G. Quantitative organic analysis by functional groups. Moscow: Khimiya, 1983, 672 p.
13. Sauer E.A., Ershov A.B. Modern analyzers for determining nitrogen using the Kjeldahl method. Analitika i kontrol, 2019, no. 2, pp. 168–192. DOI: 10.15826/analitika.2019.23.2.002.
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15. State Standard 32979–2014. Solid mineral fuel. Instrumental method for the determination of carbon, hydrogen and nitrogen. Moscow: Standartinform, 2015, 11 p.
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17. Ponomarenko S.A., Shimkin A.A. Chromatographic methods of analysis: possibilities of application in the aviation industry (review). Zavodskaya laboratoriya. Diagnostika materialov, 2017, vol. 83, no. 4, pp. 5–13.

dx.doi.org/ 10.18577/2307-6046-2024-0-5-91-100

УДК 539.231:669.859:537.622

Buzenkov A.V., Burkanov M.V., Valeev R.A., Piskorsky V.P.

PROPERTIES OF SINTERED MAGNETS Pr–Dy–Fe–Co–B DEPENDING ON THE COMPOSITION AND TECHNOLOGICAL PARAMETERS OF MANUFACTURE

Magnetic hard materials (Pr_1–xDy_x)_13,12–13,3(Fe_1–yCo_y)_{76,29–78,98}B_7,86–10,5 (x=0,40–0,58, y=0,20–0,24) for navigation devices are investigated depending on the composition and temperature of sintering. Measurements were carried out on a vibrating magnetometer on spherical samples at a temperature of 20±5 °C in magnetic fields up to 1800 kA/m. The demagnetization curves of sintered materials were measured by magnetization and induction with different cobalt and dysprosium contents. Special attention is paid to the rectangularity of the demagnetization curve depending on the composition and temperature of sintering.

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Buzenkov A.V., Burkanov M.V., Valeev R.A., Piskorsky V.P.Properties of sintered magnets Pr–Dy–Fe–Co–B depending on the composition and technological parameters of manufacture

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