Abstract:
This paper presents the results of the digitalization of the thermoplastic beryllium oxide slurry
forming process using ultrasonic activation. Ceramics made from beryllium oxide (BeO) using
ultrasound-assisted forming exhibit more intense sintering and, in comparison to ceramics
formed without ultrasound, have reduced shrinkage (by 2.4-4.3%) and sintering temperature (by
50-180°C). The forming processes occurring during ultrasonic treatment resulted in the
homogenization of the thermoplastic suspension and dense packing of BeO powders in the
casting. Ultrasound activation alters the rheology of the thermoplastic slurries. These changes
are attributed to processes of slurry mass dispersion and mass exchange at the phase boundary
of the suspension. Ultrasound activation also enhances casting properties. During the coolingsolidification process under the influence of ultrasound, the density and strength of the castings
increase due to the effective compensation of shrinkage. Shrinkage compensation is carried out
according to the classical scheme by supplying a liquid suspension. For hot casting with
ultrasound of thermoplastic beryllium oxide slurries, it is advisable to use compositions with a
binder content of 11.0-11.7% by weight since these compositions provide better shrinkage
compensation and, consequently, a denser casting.
