Microstructure and phase composition of cordierite-based co-clinker

Electrical, Microstructural and Physical characteristics of talc-based cordierite ceramics

“…Cordierite is crystallized beginning from 1200ºC at the expense of enstatite, mullite, cristobalite and diopside (Table 3) [21,22,24,55,57]. This is aided by the high contents of TIOs of the batches (2.03-11.44wt.%, Table 2) which accelerates the solid-state formation of orthorhombic cordierite by lowering its crystallization temperature [20,24,27,[58][59][60]. In addition, the TIOs initiate the early formation of silicate-rich melt (68.52-81.39wt.%) at 1355 and 1400ºC, respectively, which is aided by the partial dissolution of mullite, enstatite and cristobalite.…”

“…9, 10). The developed micro-cracks may result from the thermal expansion mismatch between the glassy and crystalline phases [20,27,64,65].…”

“…Cordierite ceramics are formed in the temperature range 1300-1400ºC [17, 18]. They generally have a very low CTE (2.50×10 − 6 ºC − 1 ), high resistance for repeated cycles of heating and cooling (30 cycles), excellent dielectric constant (2.80-20.30) and loss tangent (≈ 0.02) [19][20][21]. The sintering conditions, raw materials, uxing/impurity oxides and the fabrication techniques affect the thermo-mechanical and electric characteristics of cordierite ceramics [17,20,[22][23][24].…”

“…Cordierite ceramics can be prepared by several techniques, such as solid-state, co-precipitation, sol-gel and hydrothermal treatment [17,[25][26][27]. The solid-state reaction is the applied method for preparing cordierite ceramics, according to the stoichiometric composition of cordierite, at high temperature using natural starting materials including MgO, Al 2 O 3 and SiO 2 [20,27, 28]. The natural raw materials as talc, kaolin and feldspars are usually used in industrial/traditional production of cordierite ceramics because the chemical contents of these materials, in terms of SiO 2 , Al 2 O 3 , and MgO, are close to those of cordierite composition [27,[29][30][31].…”

“…They generally have a very low CTE (2.50×10 − 6 ºC − 1 ), high resistance for repeated cycles of heating and cooling (30 cycles), excellent dielectric constant (2.80-20.30) and loss tangent (≈ 0.02) [19][20][21]. The sintering conditions, raw materials, uxing/impurity oxides and the fabrication techniques affect the thermo-mechanical and electric characteristics of cordierite ceramics [17,20,[22][23][24].Cordierite ceramics can be prepared by several techniques, such as solid-state, co-precipitation, sol-gel and hydrothermal treatment [17,[25][26][27]. The solid-state reaction is the applied method for preparing cordierite ceramics, according to the stoichiometric composition of cordierite, at high temperature using natural starting materials including MgO, Al 2 O 3 and SiO 2 [20,27, 28].…”