scholarly journals Selection justification of methods for obtaining glass-ceramic materials

2019 ◽  
pp. 8-15
Author(s):  
O.V. Savvova ◽  
S.A. Ryabinin ◽  
E.A. Svitlichniy ◽  
G.K. Voronov ◽  
A.I. Fesenko
Keyword(s):  
Glass Ceramic ◽  
Slip Casting ◽  
High Strength ◽  
Ceramic Materials ◽  
Aluminum Silicate ◽  
Lithium Aluminum ◽  
Technological Parameters ◽  
Special Equipment ◽  
Advantages And Disadvantages ◽  
Glass Ceramic Materials

Advanced methods for obtaining high-strength glass-ceramic materials based on lithium aluminum silicate glass for glass and ceramic technologies are identified. Were analyzed  forming methods: pressing, thermoplastic molding and slip casting with the definition the advantages and disadvantages of in each of them. The choice of the base LAS system is substantiated and model lithium-aluminum-silicate glasses and glass-ceramic materials based on β-spodumene are synthesized by the methods of pressing, slip casting and thermoplastic molding. The features of the formation of glass-ceramic materials using various technologies are investigated. Technological parameters were established for pressing: molding powder with a fraction size from 63 to 125 μm − 70 vol. %, from 25 to 63 microns − 15 vol. %, less 25 microns − 15 vol. %, xanthan gum solution in an amount of 10 wt. %; for slip casting: slip specific weight − γ = 1852 kg/m3, pH = 9.90; for the thermoplastic formation: paraffin − 15 wt. %, beeswax − 5 wt. %, oleic acid − 1 wt. %. It has been established that the determining influence on the mechanical properties of the developed glass-ceramic materials has the character of their micro- and macrostructures. It has been established that, for the studied glass-ceramic materials, an increase in porosity and pore size significantly affects the magnitude of their compressive strength. Glass-ceramic materials obtained by wet pressing and slip technology can be recommended as the most technologically advanced in creating composite armor elements and promising in the development of high-strength glass-ceramic materials for the local protection of special equipment and technology. Composite structural materials obtained by thermoplastic processing can be used to create high-strength parts for precision mechanisms and instruments, which are subject to stringent requirements for mechanical strength.

scholarly journals Preparation of basalt-based glass ceramics

2003 ◽  
Vol 68 (6) ◽  
pp. 505-510 ◽  
Author(s):  
Branko Matovic ◽  
Snezana Boskovic ◽  
Mihovil Logar
Keyword(s):  
Optical Microscopy ◽  
Phase Analysis ◽  
Glass Ceramic ◽  
Glassy Phase ◽  
Raw Materials ◽  
Glass Ceramics ◽  
High Strength ◽  
Ceramic Materials ◽  
X Ray ◽  
Glass Ceramic Materials

Local and conventional raw materials?massive basalt from the Vrelo locality on Kopaonik mountain?have been used as starting materials to test their suitability for the production of glass-ceramics. Crystallization phenomena of glasses of the fused basalt rocks were studied by X-ray phase analysis optical microscopy and other techniques. Various heat treatments were used and their influences, on controlling the microstructures and properties of the products were studied with the aim of developing high strength glass-ceramic materials. Diopside CaMg(SiO3)2 and hypersthene ((Mg,Fe)SiO3) were identifies as the crystalline phases. The final products contained considerable amounts of a glassy phase. The crystalline size was in range of 8?480 ?m with plate or needle shape. Microhardness, crashing strength and wears resistence of the glass-ceramics ranged from 6.5?7.5, from 2000?6300 kg/cm2 and from 0.1?0.2 g/cm, respectively.

scholarly journals Solid Solutions Formation Mechanism in Cordierite-Mullite Glass Materials During Ceramization

2020 ◽  
Vol 14 (4) ◽  
pp. 583-589
Author(s):  
Оksana Savvova ◽  
◽  
Hennadiy Voronov ◽  
Оlena Babich ◽  
Oleksii Fesenko ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Formation Mechanism ◽  
Glass Ceramic ◽  
High Strength ◽  
Ceramic Materials ◽  
Ceramic Coatings ◽  
Resource Saving ◽  
Aluminosilicate Glasses ◽  
Glass Ceramic Materials ◽  
Fine Crystalline Structure

Relevance of the development of high-strength glass-ceramic coatings obtained by resource-saving technology for protective elements has been established. Structure formation mechanism in magnesium aluminosilicate glasses during heat treatment has been analyzed. Selection of the system was substantiated, model glasses and glass-ceramic materials on its base have been developed. Patterns of structure regularity and formation of the phase composition of glass-ceramic materials during their ceramization have been investigated. It was established that the presence of crystalline phase of mullite after melting leads to formation of the primary crystals and allows the formation of the fine crystalline structure under conditions of the low-temperature heat treatment at the nucleation stage. Developed high-strength glass ceramic materials can be used as a base in creating protective elements for special-purpose vehicles by energy-saving technology.

High-strength glass-ceramic materials synthesized in a large solar furnace

2015 ◽  
Vol 51 (3) ◽  
pp. 202-205 ◽  
Author(s):  
I. G. Atabaev ◽  
Sh. A. Faiziev ◽  
M. Paizullakhanov ◽  
Zh. Z. Shermatov ◽  
O. Razhamatov
Keyword(s):  
Glass Ceramic ◽  
High Strength ◽  
Ceramic Materials ◽  
Solar Furnace ◽  
Glass Ceramic Materials

scholarly journals Investigation of the thermal properties of mullite-cordierite materials

2018 ◽  
Vol 118 ◽  
pp. 111-118
Author(s):  
О. V. Savvova ◽  
O. I. Fesenko ◽  
V. D. Timofeеv ◽  
Ya. V. Poviderna
Keyword(s):  
Heat Treatment ◽  
Thermal Properties ◽  
Fire Resistance ◽  
Glass Ceramic ◽  
Linear Expansion ◽  
High Strength ◽  
Ceramic Materials ◽  
Glass Ceramic Materials ◽  
Cordierite Glass ◽  
Coefficient Of Linear Expansion

Based on the analysis of existing mullite-cordierite sitalls, the need to create high-strength materials of this type for individual and local protection against high-speed loads has been determined. They should be characterized by lower cost, due to low-temperature short-term heat treatment using domestic raw materials. An important aspect of ensuring the effective protective effect of an armor-element, in addition to its armor resistance and survivability, is the ability to withstand the effects of open flame and combustible mixtures, which is determined by the thermal properties of the sitalls. The aim of this work is to study the thermal properties, namely thermal expansion coefficient and fire resistance, high strength mullite-cordierite glass-ceramics that they are developed by us earlier. The temperature coefficient of linear expansion was determined using a quartz vertical dilatometer QVD-5A (ASTM C 372-94 (2007)), fire resistance according to GOST 33000—2014. According to X-ray diffraction and differential thermal analyzes, the experimental samples were divided into two groups according to the formation mechanism of structure and phase composition of glass materials during heat treatment. For each of the materials groups, the influence of the chemical and phase compositions on the thermal coefficient of linear expansion of the original mullite-cordierite glass materials and glass-ceramic materials (sitalls) thermally treated using two-stage heat treatment was determined. The study of the fire resistance of the developed glass-ceramic materials made it possible to establish that they withstand the thermal load in a certain mode for 360 minutes. It has been established that providing high thermal- and fire resistance (RE 360 (h)) is a determining factor in the production of hardened glass crystalline materials that are able to resist to thermal destroying at sharp temperature change.

Development of High-Strength Glass–Ceramic Materials by Utilization of Slag Discharged from Steel-Making Industry in Korea

2016 ◽  
Vol 8 (12) ◽  
pp. 2295-2298
Author(s):  
Dongyoon Shin ◽  
Duk-Hee Lee ◽  
Mijung Yoon ◽  
Hyun Seo Park ◽  
Sung Mo Seo ◽  
...  
Keyword(s):  
Glass Ceramic ◽  
High Strength ◽  
Ceramic Materials ◽  
Steel Making ◽  
Glass Ceramic Materials

High-Strength Spodumene Glass-Ceramic Materials

2017 ◽  
Vol 49 (3) ◽  
pp. 479-486 ◽  
Author(s):  
O. V. Savvova ◽  
O. V. Babich ◽  
G. K. Voronov ◽  
S. O. Ryabinin
Keyword(s):  
Glass Ceramic ◽  
High Strength ◽  
Ceramic Materials ◽  
Glass Ceramic Materials

Exploring high-strength glass-ceramic materials for upcycling of industrial wastes

2015 ◽  
Vol 21 (6) ◽  
pp. 1061-1067 ◽  
Author(s):  
Gu-Seul Back ◽  
Hyun Seo Park ◽  
Sung Mo Seo ◽  
Woo-Gwang Jung
Keyword(s):  
Glass Ceramic ◽  
High Strength ◽  
Ceramic Materials ◽  
Industrial Wastes ◽  
Glass Ceramic Materials

scholarly journals Innovative directions of development of ceramic materials for dentistry

2021 ◽  
pp. 19-25
Author(s):  
O.V. Savvova ◽  
G.K. Voronov ◽  
O.I. Fesenko ◽  
Yu.O. Smirnova ◽  
E. Bairamov
Keyword(s):  
High Temperature ◽  
Glass Ceramic ◽  
Glass Ceramics ◽  
Lithium Disilicate ◽  
Ceramic Materials ◽  
Oxide Glass ◽  
Lithium Silicate ◽  
Silicate System ◽  
Advantages And Disadvantages ◽  
Glass Ceramic Materials

The need to improve the level of dental health of the population of Ukraine was identified. The prospects for the use of ceramic prostheses to provide quality medical care in dentistry have been established. An analytical review of various types of ceramic and glass-ceramic materials used as dental prostheses for tooth replacement: porcelain, alumina, zirconium oxide, glass-ceramics based on leucite and lithium disilicate and mica with the addition of fluorides. Peculiarities of the structure and operational properties of ceramic and glass-ceramic materials for dentistry have been identified, their advantages and disadvantages have been established. The effectiveness of the use of glass-ceramic materials based on lithium disilicate for dental prosthetics is substantiated. The basic lithium silicate system was selected and glasses for obtaining glass-ceramic crowns based on lithium disilicate by the method of high-temperature pressing and calcium phosphate-silicate system for obtaining glass-ceramic coatings were synthesized. The methodological approach to the development of glass-ceramic prostheses based on lithium disilicate is determined. The limits of the compositions of oxide components are determined and raw materials for the synthesis of the glass matrix are selected. The technological parameters of melting (T = 1350 – 1400ºС) and heat treatment with simultaneous formation of products (stage of nucleation T = 600 – 650ºС, τ = 30 – 60 min; stages of formation T = 900ºС, τ ≈ 20 min) are selected. The composition of fluoroapatite glass-ceramic coating for glazing of glass-ceramics and the mode of its firing (T = 800 – 850ºС, τ ≈ 1,0 – 1,5 min) were determined. The serviceability of the developed glass-ceramic samples DL st.glass, which were obtained by the technology of high-temperature pressing, are determined. The comparative analysis of glass-ceramic prostheses for dentistry allowed to establish that the operational properties of the developed glass-ceramic prostheses according to ISO 6872:2015 are at the level of world analogues. This will allow them to successfully compete in the Ukrainian market with well-known foreign counterparts and help ensure the social priorities of the state in the field of health care.

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