Preparation of corundum and steatite ceramics by the freeze-drying method

Recent trends in shape forming from colloidal processing: A review

“…As it has been mentioned before, the first processes developed tried to obtain dense pieces, since sublimation improves drying stage, as Kwiatkowski et al 16) demonstrated with pieces made of traditional ceramic materials as steatite, corundum and mullite, showing more homogeneous microstructures and relatively high flexure strength values and lower sintering temperatures. In similar manner, Dogan et al 58) increased the solid content of the suspension over 55 vol % and prepared alumina bodies with small pores uniformly distributed, since the crystals growth was restricted by the high solid content.…”

“…14), 15) It appeared as a way of drying green bodies, but the spectacular microstructures observed initiated the interest in its development for producing porous bodies. Although it can be employed to prepare dense materials, 6), 16) its main field of application is now the preparation of porous materials, where structures with aligned porosity 17), 18) have been prepared using a variety of materials.…”

Effects of preparation methods on the oxygen nonstoichiometry, B-site cation valences and catalytic efficiency of perovskite La0.6Sr0.4Co0.2Fe0.8O3−δ

“…La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3Àd is a typical example of these perovskite materials and has been widely studied for these application purposes. Applications of these MIEC composite oxides always start with the high-quality powder synthesis and several methods like solid state reaction, freeze-drying, sol-gel, hydrothermal, co-precipitation and combustion of metal-organic precursors have been employed [11][12][13][14][15][16][17][18][19][20]. Among these methods, sol-gel and low temperature combustion are often cited as novel synthesis techniques for advanced applications.…”

Low-temperature synthesis of La0.6Sr0.4Co0.2Fe0.8O3−δ perovskite powder via asymmetric sol–gel process and catalytic auto-combustion

“…Consequently, both the electrical and mechanical properties of the final sintered ceramic products by the conventional standard method are not adequate for many advanced applications. In order to obtain homogeneous fine powders, other different methods via various wet-chemistry routes such as freeze-drying, co-precipitation and combustion of metal-organic precursors, have been proposed [13][14][15][16][17][18][19][20][21][22]. Among these techniques, the combustion method based on water-soluble chelated complexes as precursors to obtain the homogeneity of the metal ion distribution on the atomic level, is currently attracting considerable attention.…”