Microstructure and properties of porous SiC ceramics with AlN–RE2O3 (RE = Sc, Y, Lu) additives

Densification behavior and attrition resistance of porous Al2O3beads prepared by dripping‐ice templating

“…Particles/granulates’ attrition is highly affected by both test parameters and the mechanical strength of the materials 9,37 . The mechanical strengths of porous ceramics are dependent predominantly on the necking area and porosity 38 . The morphology observation of the lamellar pore walls (Figures 2 and 4) shows that the interparticle necks grew and the pore diminished by increasing the sintering temperature, which could contribute to increasing the mechanical strength of porous Al 2 O 3 beads.…”

“…9,37 The mechanical strengths of porous ceramics are dependent predominantly on the necking area and porosity. 38 The morphology observation of the lamellar pore walls (Figures 2 and 4) shows that the interparticle necks grew and the pore diminished by increasing the sintering temperature, which could contribute to increasing the mechanical strength of porous Al 2 O 3 beads. High attrition resistance implies withstanding stress during the attrition test.…”

Effects of pore size on electrical and thermal properties of porous SiC ceramics

“…Additive composition: Additive composition influences the necking area and grain boundary structure of porous SiC ceramics. 32,42 Yeom et al 42 observed the effect of rare-earth oxide composition on the thermal conductivity of porous liquid-phase-sintered SiC (LPS-SiC) ceramics. Specifically, the thermal conductivity of porous SiC ceramics with the same porosity (54.2%) improved by ∼56%, from 9.2 W⋅m −1 ⋅K −1 for the porous SiC ceramic sintered with 5 vol% AlN-Lu 2 O 3 to 14.4 W⋅m −1 ⋅K −1 for that sintered with 5 vol% AlN-Sc 2 O 3 .…”

“…Additive composition: Additive composition influences the necking area and grain boundary structure of porous SiC ceramics 32,42 . Yeom et al 42 …”

“…However, the thermal conductivity of dense SiC ceramics sintered with 3 vol% Gd 2 O 3 ‐Y 2 O 3 increased with increasing grain size 38 . It is expected that the coarsening of the SiC grains decreases the grain boundary area per unit volume, causing fewer phonon scattering events at the grain boundaries and resulting in higher thermal conductivity. Additive composition: Additive composition influences the necking area and grain boundary structure of porous SiC ceramics 32,42 . Yeom et al 42 …”