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European Journal of Applied Sciences – Vol. 10, No. 6
Publication Date: December 25, 2022
DOI:10.14738/aivp.106.13295. Kovziridze, Z., Mshvildadze, M., Nizharadze, N., Tabatadze, G., Darakhvelidze, N., & Balakhashvili, M. (2022). The Receiving and
Study of Celsian Electrotechnical Ceramics with Innovation One Stage Simplified Technologies in the Bao-Al2O3-Sio2 System.
European Journal of Applied Sciences, 10(6). 88-101.
Services for Science and Education – United Kingdom
The Receiving and Study of Celsian Electrotechnical Ceramics
with Innovation One Stage Simplified Technologies in the Bao- Al2O3-Sio2 System
Zviad Kovziridze
Georgian Technical University
Institute of Bionanoceramic and nanocomposite technology
Str. Costava 69, 0160 Tbilisi, Georgia
Maia Mshvildadze
Georgian Technical University
Institute of Bionanoceramic and nanocomposite technology
Str. Costava 69, 0160 Tbilisi, Georgia
Natela Nizharadze
Georgian Technical University
Institute of Bionanoceramic and nanocomposite technology
Str. Costava 69, 0160 Tbilisi, Georgia
Gulnazi Tabatadze
Georgian Technical University
Institute of Bionanoceramic and nanocomposite technology
Str. Costava 69, 0160 Tbilisi, Georgia
Nino Darakhvelidze
Georgian Technical University
Institute of Bionanoceramic and nanocomposite technology
Str. Costava 69, 0160 Tbilisi, Georgia
Maia Balakhashvili
Georgian Technical University
Institute of Bionanoceramic and nanocomposite technology
Str. Costava 69, 0160 Tbilisi, Georgia
ABSTRACT
Goal: Barite based celsian ceramics with phase composition accordingly (mass%):
of celsian 93; Barium Aluminate and Barium Silicate-4; Glass phase - 3, has been
synthesized on the bases of local raw materials with single stage innovation
technology. Method:One burn at 16000C we have take out from standard technology
in which barium carbonate is used. The material displays the best properties in
conditions of synthesis at 1410-1460°C Results: Its properties have been studied in
complex. The material shows high resistanse to heat shock. A completely new
mechanism of ceramic production is proposed. Structure of celsian ceramics in BaO-
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89
Kovziridze, Z., Mshvildadze, M., Nizharadze, N., Tabatadze, G., Darakhvelidze, N., & Balakhashvili, M. (2022). The Receiving and Study of Celsian
Electrotechnical Ceramics with Innovation One Stage Simplified Technologies in the Bao-Al2O3-Sio2 System. European Journal of Applied Sciences,
10(6). 88-101.
URL: http://dx.doi.org/10.14738/aivp.106.13295
Al2O3-SiO2 system is studyd with electron microscope, X-ray, crystalline phase
content, optical microscope. Water absorbtion, W%=O. Bending strength of non
glazed, δ N/mm2 – 69. CLTE, α20-700 106C-1 temperature areas-3.7. Tanget of a
dielectric loss angle at 50 Hz and 20°C and tg δ 10-4=107. HV GPa-18.0. Volume
resistivity, ρ ohm/cm 200C-3000C=1016-1012. Elastic modulus, E N/mm2-74.5. The
process of pores filling, full consolidation of material and hardness growth at
comparatively high temperatures of baking interval are studied. Conclusion: High
refractoriness of celsian, (1740°C), low thermal coefficient of linear expansion of
synthesized materials, high thermal resistivity enable this ceramics to be
recommended for introduction in electronical and electrotechnical industry.
Key words: electron microscope, crystalline phase, transformation, reaction, celsian,
silicate, aluminate.
INTRODUCTION
Technical progress needs the development of new innovation simple technologies. The
scientists and technologists work on receiving high property modern materials by sim- plification of expensive technologies.
With one-stage technology instead of traditional two-stage technology (BaC03 and Geopolymer
- kaolin composition, burnd two times at 16000C), for BaO-Al2O3-SiO2 system in barite (Georgia),
geopolymer - refractory clay (Ukraine) composition we obtained [1] composites В-1 with 93
mass% celsian phase content (Fig. 1). The rest consists of barium aluminates, barium silicates
and glass phase. In composition of B-3 ceramics 12-14 mass% corundum is added at the
expense of barite content decrease. The material displays the best properties in conditions of
synthesis at 1410-1500°C (Table 1). Deformation temperature of ceramic materials is
primarely determined by their phase composition, character of structure and mutual
intergrowth of crystal formations, quantity and viscosity of vitreous phase. Material texture -
character of its grain composition, number and arrangement of pores - is of certain significance.
Dense items have a relatively high initial softening point and 4% compression, and final
deformation temperature (20% and 40% compression) is mainly determined by chemical
composition, rather than by material structure.
Deformation point of ceramics of pure oxides, containing small quantity of vitreous phase,
approaches its melting point, i.e. is due to plastic deformation of crystal matter, making up
ceramics. Deformation temperature would increase the more, the less are the vitreous easy- melting interlayers between grains closely adjoint at boundaries.
Ceramic materials, produced from the natural material contaminated with different raw
admixtures, always contain a certain amount of vitreous phase. The greater the amount of
vitreous phase, the greater the decrease of the item deformation point, as compared to their
refractoriness. Deformation of ceramic materials under load at high temperatures determines
the capacity to resist simultaneous effect of high temperatures and liquefying load.
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European Journal of Applied Sciences (EJAS) Vol. 10, Issue 6, December-2022
Services for Science and Education – United Kingdom
THE BODY OF THE ARTICLE
Table 1 Properties of celsian (BaO.Al2O3.2SiO2) materials
No Denomination of parameters T°C Value of parameters
B-l B-3
1 2 3 4 5
1 Firing temperature, ToС 1410-1500 1400-1450
2 Water absorption W% 0 0-0.1
3 Bending strength of non glazed,
δ N/mm2
1350 33.0 42.5
1410 66.4 72.6
1450 68.7 56.0
1500 59.3 -
4 Compression strength of non- glazed,
1350 153.8 214.5
δ N/mm2 1410 443.8 428.0
5 Density, ρ g/cm3 1100 2.13 1.93
1350 2.55 2.49
1410 2.99 2.98
1450 3.03 2.62
1500 2.96
6 Elastic modulus, E N/mm2103 1410 71.32 69.35
1450 74.53 79.22
1500 78.50 -
7 Shear modulus, G N/mm2103 1410 28.36 28.00
1450 29.05 31.45
1500 31.48 -
8 CLTE, α 106C-1 temperature
areas
20-100 2.7 2.8
20-600 3.7 4.4
20-1000 4.1 4.9
9 Poisson's ratio, μ 1410 0.283 0.239
1450 0.282 0.259
1500 0.284 -
10 Heat capacity Cp 20-200 J/kg °K 1500 608 623
11 Heat conduction, λ WT/mK 20-
200°C
1410 1.29 1.91
fired at T°C 1500 2.32 -
12 Chemical stability after 1 hour
boiling, %in water
in NaOH (35%)
1410 99.3 99.5
1450 99.0 98.7
13 Volume resistivity, ρ ohm/cm 1450
20° С 1016 1014
300°C 1012 1010
14 Tanget of a dielectric loss angle
at 50 Hz
107 230
and 20°C and tg δ 10-4 -
15 HV, Gpa 18.00 24.00