Vitrification of illitic clay from Malaysia

Fluxing action of illite and microcline in a triaxial porcelain body

“…4) showed that illite had transformed into sericite (KAl 2 (Si 3 Al)O 10 (OH) 2 ) at 900 • C which is similar to our previous findings. 8 Mössbauer study of pure illite showed that the dehydroxylation actually occurred between 350 and 900 • C whereas this change could not be detected by the XRD. 11 Dehydroxylation of illite was reported to occur via a multi-step mechanism namely a low temperature step and a high temperature step.…”

“…Our previous study on illitic ball clay using X-ray powder diffraction (XRD) and scanning electron microscopy (SEM) showed that vitrification of this clay started around 900 • C and was complete at 1200 • C. 8 Illite is a clay-sized, non-expanding, dioctahedral, aluminous potassium mica-like mineral. 2 Recently illite was defined illite as a "K-deficient mica with an approximate formula of K 0.88 Al 2 (Si 3.2 Al 0.88 O 10 )OH 2 .…”

“…8 Diffusion of potassium ions from the illite crystals to the matrix resulted in the formation of long needle shaped mullite crystals in the illite relict. 8 In the present study, illite mineral was used as a fluxing agent in ceramic bodies, in parallel with the use of a common fluxing agent, potash feldspar (microcline). Potash feldspar was replaced by illite mineral of the same average size and size distribution at the same weight ratio.…”

Polarization and depolarization currents in kaolin

“…Metaillite also partially changes into spinel phase but it mostly changes into glassy phase above 900°C. When the mixture contains calcite, gehlenite and anorthite are created between 900°C and 1000°C (Ruotsala, 1963;Hanykýř and Kutzendorfer, 2000;Traoré et al, 2003;Gualtieri and Ferrari, 2006;Kurama, and Ozel, 2009;Wattanasiriwech et al, 2009;Ptáček et al, 2010;Escalera et al, 2012).…”

Mechanical properties of illite‐based ceramics with controlled porosity studied by modern in situ techniques

“…Moreover properties of illite have seldom been investigated in comparison with kaolinite even though illite‐based ceramic products exhibit enhanced plasticity of green ceramic mixtures and can be utilized, for example, in the production of tableware, tiles, and bricks . Furthermore, the presence of illite in ceramic mixtures enhances the formation of glassy phase (ie, illite acts as a flux) during firing and decreases the glass‐transition temperature as well as the water absorption of final products …”