| Popis: |
The engineering aspects are regarded for the porous α-Al2O3 eramics' preparation under the zonal densifcation during the powder blanks sintering formed out of the fnely dispersed end products of the alumina powder PAP-2's flake particles air combustion. It was demonstrated that the porous structure in the sintering material was forming by means of local pulloff mechanism which had effect at the agglomerated particle boundaries creating the open interagglomerate porous, as well as by the sealed intragranular porous system's arising. The obtained ceramics properties are the following: the density is 2,45 g/cm3, total porosity is 39 %, open porosity is 30 %, sealed porosity is 9 %, the ultimate bending strength 50‒60 MPa.Ill. 6. Ref. 16. Tab. 1. |
