Investigation of the thermal properties of protective lithium aluminum silicate glass-ceramic materials
protective glass-crystalline materials, β-spodumene, lithium disilicate, temperature coefficient of linear expansion, elements of individual armor protection, fire resistance, lithium aluminum silicate materials
Abstract
The main directions of the development of lithium aluminum silicate glass-ceramic materials have been analyzed and the prospects of introduction in the military field for protective heat resistant armored elements used in the conditions of high-speed mechanical loads and exposure to high temperature have been established. The purpose of this scientific and practical work is to study the thermal properties of lithium aluminum silicate glass-ceramic materials. Model lithium aluminum silicate glasses have been developed and glass-ceramic materials based on them have been synthesized. The influence of the structure of the developed glass-ceramic materials on their coefficients of linear thermal expansion is investigated and the determining effect of the phase composition on the thermal properties is established.
It was established that the base factor in determining the influence of phase composition on the temperature coefficient of linear expansion of research materials is the presence and content of β-spodumene in their composition. An important condition for the formation of a defectless glass-ceramic material is to ensure the reduction of microstresses at the phase boundaries due to the formation of solid solutions, characterized by values of CTE approximate to the glass phase. According to the relative elongation curves of the studied materials, were determined important characteristic temperatures necessary for the heat treatment process: glass transition temperature and dilatometric softening temperature.
The use as the elements of individual armor protection, developed glass-ceramic materials, will reduce the thermal shock that occurs on impact of missile with armored material, which will allow to be used them as materials for armored elements. Ensuring the fire resistance of the developed glass-ceramic materials determines their ability to withstand, without destroying, to the action of an open flame.
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