Kol"va, Alexey Sergeevich

Work experience in the project from the customer of JSC RSK MiG in MAMI. The aim of the project is to find optimal parameters when using friction stir welding (STP). In order to modernize the training aircraft of the TCB MIG-AT, it was proposed to manufacture the welded keel of this aircraft from heat-resistant aluminum alloy 1161 by friction welding with mixing and removing titanium alloy protective panels from the structure. The quality of the welded keel depends on the parameters of the friction mixing welding mode and on the configuration and wear resistance of the working tool. In this regard, the properties of welded joints made of various aluminum alloys have been studied and the optimal modes of their friction-mixing welding have been determined. Recommendations for increasing the service life of the tool are proposed. To prevent chipping of the tool, it is necessary to protect the surface of the tool from aluminum penetration occurring during the welding process. According to the results of the analysis, several options for increasing resistance (ion nitriding - electroerosive alloying) have been proposed. It was also found that the foreign inclusions in the weld are the intermetallides of the Fe-Al system, formed during the STP process due to the mutual diffusion of metals, and falling into the weld when chipping from the tool due to brittleness. Conducting research, microstructural analysis, literature study, sample preparation, report design. Experience in designing parts of assemblies, gearboxes. Materials, alloys for research: Fe-Al/1161, Fe-Cu, Cu-Al, Cu-Fe-Al. Conducting research, microstructural analysis, literature study, sample preparation, report preparation. Experience in designing parts, gearboxes.

Measurement of mechanical, physico-chemical and thermophysical properties of cermet samples, including on PO (porosity, grain score assessment, etc.)Conducting RFA/RSFA, SEM/REM, X-ray removal

Study of the sequence of structure formation in gorenje wave

Research work on the subject of powder metallurgy

Report on scientific research in the field of cermet creation

Presentation at conferences

SAMPLE PREPARATION AND SCIENTIFIC PUBLICATION

Fe-Al/1161, Fe-Cu, Cu-Al, Cu-Fe-Al

Carbide (Hf-Zr-Nb-Ti-Ta)C

Boride (Zr-Nb/Hf-Ta)B

Scientific publications and articles published in journals / SpringerLink Nature (Springer Nature Group), Semantic Scholar, ELSEVIER, ResearchGate, Elibrary, Experimental Materials (Inorganic Materials: Applied Research), Online resources /

1. Kolva A. S., Kurbatkina V. V. The study of Tvardov's works (Nb(1-x),Zrx)B2 by the SVS method // "77th Day of Science-students of the National Research University "MISIS" international, interuniversity and institutional scientific and technical conferences, book 1". April 2022 NUST MISIS. – Collection of abstracts, p. 321. ISBN 978-5-907560-41-3

2. V. V. Kurbatkina, E.I. Pakhera, D.A. Sidorenko, T.A. Sviridova, P. A. Loginov, A. S. Kolva, E.A. Levaev-Preparation, structure and coupling of diboride solids (Nb(1-x)Zrx)B2, 2022

3. Preparation, structure and properties of solid solutions (Nb(1-x)Zrx)B2, 2022 V.V. Kurbatkina, E.I. Patsera, D.A. Sidorenko, T.A. Sviridova, P.A. Loginov, A.S. Kolva, E.A. Levashov.

4. Kolva A. S., V. Kurbatkina. V. Obtaining dense samples of solid solutions of double diborides in the system (Zr, Nb)B2 SHS and hot pressing // "78th Days of Science for students of NUST MISIS international, interuniversity and institute scientific and technical conferences, book 1". April 2023 NUST MISIS

5. Kolva A. S., Kurbatkina V. V., Pakhera E. I., Sviridova T. A., Loginov P. A., Sidorenko D. A., Levashov E. A. Receipt, structure and basic concepts.x manufacturer of diborides (Hf1–xTax)B2. Perspective Materials, 2023, No. 1, pp. 55-65. DOI: 10.30791/1028-978X-2023-1-55-65

6. A.S.Kolva, V.V. Kurbatkina, E.I. Patsera, T.A. Sviridova, P.A. Loginov, D.A. Sidorenko, E.A. Levashov Preparation, structure and properties of solid solutions of diboride (Hf1-xTax)B2 // Inorganic materials: applied research. 2023, No. 1, pp. 55-65. DOI: 10.30791/1028-978X-2023-1-55-65

7. Annotations of graduation papers // Department of Powder Metallurgy and Functional Coatings, 2023

8. V.V. Kurbatkina, E.I. Patsera, T.A. Sviridova, A.S. Kolva, E.A. Levashov Synthesis by gorenje of ultrahigh-temperature solid solutions (ZrxNb1-x)B2. Part 1. Gorenje and structuration mechanisms

9. V.V. Kurbatkina, E.I. Patsera, T.A. Sviridova, A.S. Kolva, E.A. Levashov Alexey Sergeevich Gorenje synthesis of ultrahigh-temperature solid solutions (ZrxNb1-x)B2. Part 2. Fine tuning of mechanical properties and thermal conductivity of solid diboride Zr-Nb-B. solutions for ultra-high temperature applications

10. V.V. Kurbatkina, E.I. Pakhera, T.A.Sviridova, P.A.Loginov, D.A. Sidorenko, A.S. Kolva, E.A. Levanov Preparation, structure and main provisions of the Twardovskoho composition of diborides (Hf1–xTax)B2, Perspective materials, 2024, No.5(6), DOI: 10.1134/S2075113323050210

11. V. V. Kurbatkina, E. I. Patsera, T.A.Sviridova, P. A. Loginov, D. A. Sidorenko, A. S. Kolva, E. A. Levashov Synthesis, structure and properties of solid solutions of diborides (Hf1–xTax)B2, Inorganic Materials: Applied Research 14(5-6): 1312-1320, March 2024, No.5(6). DOI: 10.1134/S2075113323050210

Research methods

Measurement of mechanical, physico-chemical and thermophysical properties of cermet samples, including on PO (porosity, grain score assessment, etc.)

Conducting X-ray/X-ray, SEM/REM, X-ray removal

Study of the sequence of structure formation in gorenje wave

Research work on the subject of powder metallurgy

Report on scientific research in the field of cermet creation

Speaking at conferences

QPQ-PROCESS

Conducting an experiment to determine the optimal chemical composition of salts for obtaining a carbonitrated dense layer (ε-phase 15 microns; oxide layer 30-50 microns) with a low cyanide content (CN - up to 5%, CO3 2- up to 42%) in the process of nitrocementation, oxidation of steels for import substitution of foreign salts by the QPQ process, chemical composition control baths for the maintenance of CN/CNO

Materials for processing

08X18H10T, 12X18H10T 30 X, 40X40X13, VK/TK/TTK/BP-20VAMN-19, MCHVP, M0b, MH, Nb, Si sheets, tape, foil, in bars CM-7W-Cafe-Ni-Co/Fe-Si-Al, Constantan/Trimetal Al2O3-CaO-Fe