THE PROPERTIES OF MULLITE-ZIRCONIUM CERAMICS SINTERED CONVENTIONALLY OUT OF THE POWDERS OBTAINED BY COMBUSTION PROCESS

Abstract

The investigating results are given in the article for the powders crystal phases development, pore and particle size distributions. The powders have been obtained in course of combustion process on the water base with the using of metals nitrate solution mixtures, SiO₂ (aerosil), oxidize and various fuels. The results are presented for the crystal phase forming, pore size distribution, apparent density, caking index, and physical and mechanical properties of the samples sintered conventionally at 1300-1500 °C out of obtained powders without clay additions and with clay additions. The powders formed in course of the carbamide and citric acid combustion can be characterized by both the developed mullitization and tetragonal phase ZrO₂ crystallization, as well as by both the relativery large and large-sized pores formation, and by the finely- and medium-divided particles. The samples sintered at 1300-1500 °C, out of these pwoders with the clay additons have developed phase crystallization, the largest both aparent density, coke index, physical and mechanical properties comparing to the samples sintered out of similar powders without clay additions, as well as comparing to the samples sintered with the clay addition out of powders obtained in course of glucose and sucrose combustion. Ill. 6. Ref. 12. Tab. 6.