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Registration Number

0214U001573, 0111U002121 , R & D reports

Title

Study of influence both magnetic and MKW electromagnetic fields on hot pressing reactionary for ceramic matrix composites to electrical application, as well as development monitoring methods of microstructure both evolution and degradation during manufacturing processes and high temperature exploitation.

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Head

Petrovsky Vitaly,

Registration Date

13-03-2014

Organization

I.N.Frantsevich Institute for Probmens of Materials Sciences Ukrainian Academy of Science

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Object of research - the precipitation gradient ceramic composites on the basis of silicon and aluminum nitrides, obtained at hot pressing under the influence of constant magnetic field with variations in technological factors . The purpose of the work is development of physico-chemical technology of 3D-inhomogeneous hypercomposites on electrotechnical purpose, received in the process of the reaction of hot pressing in the magnetic field of the solenoid and development of electric methods of monitoring of the microstructure of ceramic composites for operative optimization technological parameters of the process of their content and implementation on their basis a new type of the function of dielectric and resistive devices for work in extreme conditions. We studied the influence of a constant magnetic field of the solenoid on the microstructure and properties of the material and it is shown that in the presence of rubber HfC additives content linearly correlated with weight loss and an increase in particle size, and in the presence of the CMC growth weight loss is not observed, and metal like additive remains in fine condition. For the first time the threshold character of the effect of cooling rate after the HP on the number and type of point defects formed was observed, which is manifested in the magnitude of the DC conductivity and its temperature dependence. It was found that the obtained in the aggressive environment materials with predominantly covalent bonds have specific electronic states, which improve their efficiency. The occurrence of such conditions is impossible in composite materials with ion or predominantly ionic bonds. For the first time it was determined that due to the microstructure of the composite, which was formed in a magnetic field, the power needed to heat it to a certain temperature, when using demagnetize as supplements increases in 2 times, in comparison with the case of the use of paramagnetic material. Manufacture of composite on the basis of established facts, provides increase of its resource in 1.5 times. It was established that the grains size of paramagnetic and diamagnetic particles influence the value of the electromagnetic absorption: 10 times increase of the grain size improves the absorption capacity of in 3-4.

Product Description

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Ільченко В. І
Бродніковська І. В.
Власенко О.В.
Гетьман О. І
Дерій А. І
Здоровець І.О.
Кириленко К. В.
Манакіна Д. М.
Обухова Т. Ю

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2020-04-02