The increased carbon content (9.59 & # 37;) in the inclusions indicates the introduction of fuel into the raw material, which increases the porosity of the products and contributes to the uniform sintering of ceramics, and the increased content of alkali oxides (R 2 O> 4 & # 37;) - the formation of a glass phase up to 1000 & # 176; С. X-ray phase analyzes showed the presence of: anorthite, hematite and wollastonite, which contribute to an increase in strength indicators. In addition, the presence of isometric pores and oval closed porosity in ceramic specimens contributes to an increase in durability.
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