Effect of sintering atmosphere on the crystallizations, porosity, and thermal expansion coefficient of cordierite honeycomb ceramics

Recycling bagasse and rice hulls ash as a pore‐forming agent in the fabrication of cordierite–spinel porous ceramics

“…Advanced porous ceramics have received a lot of attention in recent years due to their excellent properties and are used in a variety of industrial applications such as high‐temperature thermal insulation, molten metal filtration, catalytic reaction support, automobile exhaust filter carrier, filtration of hot corrosive gases, and tissue engineering 1 . Cordierite (2MgO·2Al 2 O 3 ·5SiO 2 )‐based porous ceramics are good candidates for these applications because of their high thermal and mechanical properties as well as their chemical stability and low thermal expansion coefficient ( α = (1–2) × 10 −6 °C −1 ) 2–14 . Cordierite's low thermal expansion coefficient is mostly due to the crystal structure behavior of polymorphs of cordierite at low and high temperatures, as well as the amount and properties of the associated phases 10 .…”

“…1 Cordierite (2MgO⋅2Al 2 O 3 ⋅5SiO 2 )-based porous ceramics are good candidates for these applications because of their high thermal and mechanical properties as well as their chemical stability and low thermal expan-sion coefficient (α = (1-2) × 10 −6• C −1 ). [2][3][4][5][6][7][8][9][10][11][12][13][14] Cordierite's low thermal expansion coefficient is mostly due to the crystal structure behavior of polymorphs of cordierite at low and high temperatures, as well as the amount and properties of the associated phases. 10 At around 1100 • C, the μ-cordierite phase started to transform into the α-cordierite phase, and after 4 h of sintering at 1200 • C, the α-cordierite phase became the main crystalline phase.…”

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

“…9, 10). These developed microcracks would appear due to the differences between the coe cient of thermal expansion between cordierite (1.50×10 -6 ) (84.10-92.50wt.%, Table 3) and the minor Mg-Al spinel (7.6×10 -6 ) (7.50-12.60wt.%, Table 3) [13,27,69,70,73].…”

“…The two-cordierite polymorphic possess similar coe cient of thermal expansion (CTE) characteristics, such as, a positive CTE along the a/b axis (ca. 3.3 × 10 − 6 K − 1 ) and a negative linear CTE along the c-axis (ca.-1.6 × 10 − 6 K − 1 ) [13][14][15].…”

“…The two-cordierite polymorphic possess similar coe cient of thermal expansion (CTE) characteristics, such as, a positive CTE along the a/b axis (ca. 3.3 × 10 − 6 K − 1 ) and a negative linear CTE along the c-axis (ca.-1.6 × 10 − 6 K − 1 ) [13][14][15].Cordierite ceramics could be classi ed into: (i) traditional cordierite ceramics that mainly formulated from (natural raw materials, such as ball clays, kaolin, feldspars, silica, dolomite and talc) and (ii) advanced cordierite ceramics that are formulated from pure oxides, carbides, nitrides and non-silicate glasses [16].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].…”