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Registration Number

0220U102062, 0118U006213 , R & D reports

Title

Development of new high-temperature structural and electrotechnical materials with long-term service

Head

Shtern Mykhaylo B, Доктор технічних наук

Registration Date

08-03-2020

Organization

Institute for Problems in Materials Science

Description

Objective of investigations: development of new methods for synthesis of titanium, nichrome and refractory metal alloys that can be used as structural and electrotechnical materials in a high temperature ion radiation environment. Research objects: sintering processes, alloy formation and thermomechanical properties of the materials created on the basis of Ni-Cr(Nb)-Al-Y2O3, Ti-Al, Os-Ir-Аl and Os-W systems. Methods of investigations: technological approaches of the powder metallurgy, thermomechanical and physical testing, X-ray phase analysis,modeling It was detected Frenkel effect in the Os-W and Os-Ir-Аl film of the impregnated WBa cathodes. Correlation has been found between the lifetimes of the M-type cathodes and structure evolution of the Os-Ir-Аl і Os-W film. In the course of exploitation shrinkage of the film is observed followed by formation of large pores. Cathode lifetime can be improved if aluminum is used as a diffusion barrier in the film. New fabrication method of the intermetallic TiAl from Al3Ti and TiH2 precursors has been developed. Mechanical properties of new material are close to the cast one and it has density about 90%. New heat resistant dispersion-strengthened nickel alloy without chromium has been developed. It can be used for the thermal shielding of spaceships up to the temperature 1200 oС in the environment of the jet engines combustion products. Finite element modeling of plastic forming of this material predicts cavity formation around rigid inclusions under tension or upsetting. New model of the alloy consolidation has been put forward that allows optimization of material densification from porous green body without defect formation.

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Ivanova Inna I.
Hetman Olga І.
Maksymenko Andrii L.
Mikhailov Oleg V.
Morozov Ihor A.
Radchenko Petro Y
Solntsev Viktor P