Abstract:
The article presents the results of assessing thermal shrinkage during the formation of beryllium
oxide ceramics using the hot casting method. The thermoplastic slurry is a composite system with
a dispersion medium (binder) that has a very low thermal conductivity compared to the dispersed
phase (beryllium oxide). Ultrasonic treatment reduces the viscosity of the slurry and improves its
casting properties. The formation of beryllium oxide slurry is carried out without disrupting the
integrity of the system and depends on the casting speed and temperature factors. The combined
influence of these factors determines the casting properties of the slurry. Cooling - solidification
of the slurry in the casting mold occurs in stages in the liquid, amorphous states with a phase
transition, and in the viscoplastic state of the casting. The cooling rate of the casting at all stages
depends on the cavity design, the rheological properties of the slurry, and the casting process
parameters. It is important to maintain the integrity of the casting due to temperature shrinkage.
