Thermal conductivity of high porosity alumina refractory bricks made by a slurry gelation and foaming method

Analysis of aluminum base-reaction effect in density, porosity, and thermal insulation of porous fire bricks

“…It is clear that the porosity increases as the aluminium content increases, which also correlate linearly to the thermal insulation ability, as shown in Figure 6. This is consistent with the relation of thermal conductivity as a function of porosity, which results in the increase of thermal insulation properties [13]. Conventional fire bricks possess the highest porosity (35.42%), with the lowest thermal durability.…”

Effects of the Sintering Temperature on the Structure and Properties of the Alumina Foamed Ceramics

“…Samples were sintered at 1400 [7]. Shimizu et al fabricated Al 2 O 3 refractory bricks with 90~97.5% porosity by a slurry gelation and foaming method, which were sintered at 1500 [8] . However, some drawbacks limited the porous ceramic's applications, such as poor shock resistance, and the low strength.…”

Preparation, microstructure and high temperature performances of porous γ-Y2Si2O7 by in situ foam-gelcasting using gelatin

“…The common porous ceramics used as thermal insulators are porous SiO 2 , Al 2 O 3 and YSZ. Although these materials have specific advantages, they also have several drawbacks, such as low strength (5.82 MPa, with a porosity of 70.1%) and low operating temperature ($ 1200 1C) for porous SiO 2 [7][8][9]; high thermal conductivities [ $ 0.4 W/(m K) with porosity of $ 90%, 0.8 W/(m K) with porosity of $ 73% and 1.2 W/(m K) with porosity of $ 66%] for porous Al 2 O 3 [10][11][12]; as well as high sintering linear shrinkage (15% for porosity of 45% at 1550 1C and 31.8% for porosity of 65% at 1550 1C) and high density (1.2 g/cm 3 for a porosity of 80%) for porous YSZ [13,14]. Thus, new materials with better overall performances are highly demanded.…”