Open AccessThe Al<sub>2</sub>O<sub>3</sub> porous ceramic's preparation due to the zonal densification during the sintering of the powder blanks out of the finely dispersed alumina powder PAP-2's combustion end products
Author(s) -
Д. А. Иванов,
А. И. Ситников,
G. E. Val’yano,
Т. И. Бородина,
S. D. Shlyapin
Publication year - 2018
Publication title -
novye ogneupory
Language(s) - English
Resource type - Journals
ISSN - 1683-4518
DOI - 10.17073/1683-4518-2018-9-28-34
Subject(s) - porosity , sintering , materials science , ceramic , particle (ecology) , flexural strength , composite material , metallurgy , mineralogy , chemistry , oceanography , geology
The engineering aspects are regarded for the porous α-Al 2 O 3 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 ake particles air combustion. It was demonstrated that the porous structure in the sintering material was forming by means of local pullo mechanism which had eect 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/cm 3 , 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.