Microstructural, mechanical and thermal characterization of alumina gel-cast foams manufactured with the use of agarose as gelling agent

Abstract

Alumina gel-cast foams manufactured by using agarose as gelling agent were examined in terms of microstructural, mechanical and thermal properties. The microstructural SEM measurements of alumina foams were compared with X-ray micro tomography investigations also on the pore network. Young's modulus of alumina foams was determined by impulse excitation and ultrasonic sound velocity measurements. These two independent techniques showed similar results. Gibson and Ashby's model of completely open-cell and closed-cell foams was compared with experimental data from compression tests. The thermal conductivity measurements using laser-flash analysis were correlated with the pore network in the alumina foam structure.

Reticulated Replica Ceramic Foams: Processing, Functionalization, and Characterization

“…The 3D pore network can only be described by the use of segmented volume data determined by m-CT or synchrotron-CT measurements. [77][78][79][80][81][82][83][84] By skeletonization algorithms, pore networks are extracted and pore segments with certain length, diameter, volume, and orientation are defined providing the basis for the tortuosity factor t, Equation 1:…”

Porosity effect on microstructure, mechanical, and fluid dynamic properties of Ti2AlC by direct foaming and gel‐casting

“…Agarose is known to form a sufficiently strong gel, which is able to withstand the foam weight even when the concentration of gelling matter is low. Moreover, it has been already proposed in the literature for Ti 2 AlC as well as other ceramic foams . The aim of this work was to manufacture Ti 2 AlC foams possessing a wide range of total porosity and an open‐cell architecture, as well as to characterize their microstructural, mechanical, and fluid dynamic properties.…”

“…Moreover, it has been already proposed in the literature for Ti 2 AlC as well as other ceramic foams. 17,[21][22][23][24] The aim of this work was to manufacture Ti 2 AlC foams possessing a wide range of total porosity and an open-cell architecture, as well as to characterize their microstructural, mechanical, and fluid dynamic properties. Special attention was paid to the characterization of their permeability in the temperature range from room temperature (RT) to 700°C, as in the literature there is no data concerning the permeability of porous Ti 2 AlC.…”

Influence of Cell Size on Mechanical and Piezoelectric Properties of PZT and LNKN Ceramic Foams

“…[1][2][3] Ceramic foams with such high open porosity can be obtained by three common well-known methods: replica, scarified template, direct foaming. [5,6] A novel group of multifunctional composite materials can be developed by coupling the piezoelectric properties of lead zirconate titanate (PZT) or lead-free lithium sodium potassium niobate (LNKN-6) with the structural advantages of foams. [4] By increasing the relative density [2] defined as the ratio of foam density to the density of solid strut material, the mechanical properties of the cellular material increase super proportional.…”

“…[4] By increasing the relative density [2] defined as the ratio of foam density to the density of solid strut material, the mechanical properties of the cellular material increase super proportional. [5,6] A novel group of multifunctional composite materials can be developed by coupling the piezoelectric properties of lead zirconate titanate (PZT) or lead-free lithium sodium potassium niobate (LNKN-6) with the structural advantages of foams. By the introduction of periodic pores with 3-3 connectivity in piezoelectric materials piezoelectric properties can be tailored for specific applications.…”