Determination of the local densifications in the compacts

Fractures of unbaked and heat-treated specimens in the temperature range 900 - 1200 ° C, obtained from a mixture of colored granules pressed at different pressures and unpainted powder, have been investigated. It is shown that the crack moves along the boundaries of the granules modulating the areas of local compaction, and after firing at temperatures of 1050 - 1100 ° C, the fracture becomes smoother. In this case, the system (workpiece) passes into an unstable state with bifurcation properties. An increase in the heating rate from 3.5 to 6.5 ° C / min leads to a shift in the transition from uneven to even cleavage, depending on the density of the original granules (the pressure of their pressing). The establishment of the main bifurcations in the technological process and their elimination opens the way to the creation of ceramics with a reproducible structure and properties. Tal. 4, ill. 1, bibliography: 10 titles.