Self-propagating high-temperature synthesis of ceramic composite material based on Al2O3 - SiO2 - ZrB2

Abstract

The present work is devoted to the production of a ceramic composite material in the mode of self-propagating high-temperature synthesis from a mixture of powder reagents: ZrO2, Al, SiO2, B, and Zr. The adiabatic combustion temperature was calculated for the stoichiometric composition of ZrO2-Al-SiO2 and for compositions with the addition of an energy additive from powders x (Zr + 2B), where x e [10-30] wt. %. It was found that an increase in the fraction of Zr + 2B leads to the refinement of structural elements. An increase in its content to 30 wt. % leads to the formation of nanoscale structural components in the material. As a result of varying the initial composition, a ceramic composite material based on Al2O3-SiO2-ZrB2 was obtained containing an oxide matrix with particles of zirconium diboride distributed from 61 to 77 wt. %. It is shown that as a result of the SHS of the selected compositions, mullite is formed. Using SEM, EDS and XRD methods, we studied the structural features and phase composition of the materials obtained.