Selection justification of methods for obtaining glass-ceramic materials

Abstract

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.