Kryvobok, N. A.

Kryvobok, R. V.

Lapuzina, O.

Lisachuk, G. V.

Maystat, N. S.

Pitak, Y. M.

Library of National Technical University "Kharkiv Polytechnic Institute"

91 
Radio-absorbing materials with adjustable dielectric properties 
 
G.V. Lisachuk, R.V. Kryvobok, Y.M. Pitak, О.М. Lapuzina, 
N.A. Kryvobok, N.S. Maystat 
 
National Technical University "Kharkiv Polytechnic Institute", 
21 Frunze Str., Kharkiv 61002, Ukraine, krivobok_ruslan@ukr.net 
 
It is known that radio-absorbing materials (RAM) are structural dielectrics that 
effectively absorb the electromagnetic energy of radio waves. According to the 
classification, radio-absorbing materials can be magnetic and non-magnetic. In turn, 
non-magnetic radio-absorbing materials are subdivided into gradient, interference and 
combined. Gradient RAM have a multilayer structure (see Fig. 1) with a smooth change 
of the value of dielectric permeability 
along the thickness of the material ɛ1 > ɛ2 
> ɛ3 > ɛn. The first layer of RAM should 
be made of a material having low 
dielectric losses (ɛ1) in order to match the 
wave resistance of air and material (for 
example, celsian and slavsonite). Other 
layers are made of solid dielectrics with 
high dielectric permeability 
(ferroelectrics, ferroelectromagnets and 
others), and also with the use of magnetic or non-magnetic radio-absorbing fillers, 
which are introduced into the dielectric matrix (graphite, ferrites and others). 
The work done allowed to solve the problem of obtaining a ceramic material based on 
the SrO–TiO2–SiO2 system (see Fig. 2) with high values of the permeability.  
On the basis of the studies carried out, a technology for manufacturing a ceramic 
material of composition II (SiO2 – 1.97, TiO2 
– 45.40, SrO – 52.63) with a high dielectric 
permeability was developed. The technology 
of manufacturing ceramics based on strontium 
titanate consisted of two stages. The first stage 
of synthesis occurred at a maximum 
temperature of 1300 оС with holding during 2 
hours. The second stage was carried out at a 
temperature of 1330 оС with holding for 1 
hour. It was found that the composition II has 
the best indicators (firing temperature 
1330 °C), which is located in the triangle 
Sr3T2 – SrT – SrS with the following 
properties: dielectric permeability ε = 115; water absorption W,% – 1.3; open porosity 
P,% –5.8; density ρ, g/сm3 – 4.35. 
The generalization of the obtained data allows to draw a conclusion that the 
developed composition of the ceramic material on the basis of the three-component 
system SrO–TiO2–SiO2 is promising for creating a gradient radio-absorbing material. 
Fig. 1. Schematic view of the gradient radio-
absorbing material  
 
Fig. 2. Diagram of the three-component 
system SrO–TiO2–SiO2 
Z2
ɛn
1
ɛ1 ɛ2 ɛ3
Falling Electro-
Magnetic Wave 
Absorption of Electro-Magnetic Wave


Radio-absorbing materials with adjustable dielectric properties

Electronic National Technical University &quot;Kharkiv Polytechnic Institute&quot; Institutional Repository (eNTUKhPIIR)

91 Radio-absorbing materials with adjustable dielectric properties  G.V. Lisachuk, R.V. Kryvobok, Y.M. Pitak, О.М. Lapuzina, N.A. Kryvobok, N.S. Maystat  National Technical University "Kharkiv Polytechnic Institute", 21 Frunze Str., Kharkiv 61002, Ukraine, krivobok_ruslan@ukr.net  It is known that radio-absorbing materials (RAM) are structural dielectrics that effectively absorb the electromagnetic energy of radio waves. According to the classification, radio-absorbing materials can be magnetic and non-magnetic. In turn, non-magnetic radio-absorbing materials are subdivided into gradient, interference and combined. Gradient RAM have a multilayer structure (see Fig. 1) with a smooth change of the value of dielectric permeability along the thickness of the material ɛ1 > ɛ2 > ɛ3 > ɛn. The first layer of RAM should be made of a material having low dielectric losses (ɛ1) in order to match the wave resistance of air and material (for example, celsian and slavsonite). Other layers are made of solid dielectrics with high dielectric permeability (ferroelectrics, ferroelectromagnets and others), and also with the use of magnetic or non-magnetic radio-absorbing fillers, which are introduced into the dielectric matrix (graphite, ferrites and others). The work done allowed to solve the problem of obtaining a ceramic material based on the SrO–TiO2–SiO2 system (see Fig. 2) with high values of the permeability.  On the basis of the studies carried out, a technology for manufacturing a ceramic material of composition II (SiO2 – 1.97, TiO2 – 45.40, SrO – 52.63) with a high dielectric permeability was developed. The technology of manufacturing ceramics based on strontium titanate consisted of two stages. The first stage of synthesis occurred at a maximum temperature of 1300 оС with holding during 2 hours. The second stage was carried out at a temperature of 1330 оС with holding for 1 hour. It was found that the composition II has the best indicators (firing temperature 1330 °C), which is located in the triangle Sr3T2 – SrT – SrS with the following properties: dielectric permeability ε = 115; water absorption W,% – 1.3; open porosity P,% –5.8; density ρ, g/сm3 – 4.35. The generalization of the obtained data allows to draw a conclusion that the developed composition of the ceramic material on the basis of the three-component system SrO–TiO2–SiO2 is promising for creating a gradient radio-absorbing material. Fig. 1. Schematic view of the gradient radio-absorbing material   Fig. 2. Diagram of the three-component system SrO–TiO2–SiO2 Z2ɛn1ɛ1 ɛ2 ɛ3Falling Electro-Magnetic Wave Absorption of Electro-Magnetic Wave

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Radio-absorbing materials with adjustable dielectric properties

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Library of National Technical University "Kharkiv Polytechnic Institute"

Electronic National Technical University "Kharkiv Polytechnic Institute" Institutional Repository (eNTUKhPIIR)

Radio-absorbing materials with adjustable dielectric properties

Abstract

Similar works

Full text

Available Versions

Library of National Technical University "Kharkiv Polytechnic Institute"

Electronic National Technical University &quot;Kharkiv Polytechnic Institute&quot; Institutional Repository (eNTUKhPIIR)

Electronic National Technical University "Kharkiv Polytechnic Institute" Institutional Repository (eNTUKhPIIR)