Incorporation of mullite as a bond phase into porous SiC by an infiltration technique

Synthesis of mullite bonded porous SiC ceramics by a liquid precursor infiltration method: Effect of sintering temperature on material and mechanical properties

“…Majority of these investigations have dealt with an oxidation bonding technique [7][8][9][10][11][12] or an in-situ reaction bonding processing [13]. Our group also prepared mullite bonded porous SiC ceramics following an infiltration technique [18]. A powder compact of SiC was infiltrated with a liquid precursor of the mullite which on subsequent sintering at 1300 1C produced the final ceramics.…”

Effect of Y₂O₃ addition on the properties of mullite bonded porous SiC ceramics prepared by an infiltration technique

“…The precursor of mullite was prepared by mixing stoichiometric amount of tetraethyl ortho silicate (TEOS) (Acros Organics, Pittsburgh, USA, 98 % purity) in ethanol to a solution of aluminium nitrate nonahydrate (ANN) (Merck Specialist Pvt. Ltd., India, 95 % purity) in ethanol under suitable condition following the method described earlier (19). The infiltrated samples were dried at 100 ºC for 18 h to remove the solvent and the process was repeated five times.…”

“…The effect of addition of Y 2 O 3 , alkaline earth metal oxides with the starting materials on the properties of the reaction bonded porous SiC ceramics are also discussed by several authors (15,16). Recently we have fabricated mullite bonded porous SiC ceramics by infiltrating a SiC porous compact with a liquid precursor of mullite followed by sintering at 1300-1500 ºC in air (19,20). Se han sintetizado materiales porosos de SiC-Mullita mediante la infiltración de polvo prensado de SiC y Y 2 O 3 con un precursor líquido de mullita, el cual con un tratamiento térmico posterior a 1300-1500 ° C da lugar a los materiales porosos de SiC-Mullita.…”

Study of thermal properties of mullite porous materials

“…When a second phase is introduced into a porous body by infiltration with a liquid precursor, it is converted to an inorganic phase during decomposition upon heating. The intention behind using this technique, in addition to the formation of an inorganic phase, is that it bonds the ceramic powders together with the formation of a porous network under suitable conditions of processing at low temperatures [18].…”

“…These properties make cordierite suitable for refractory applications. One of the processing forms to produce cordierite ceramics is through the calcination of a mixture of clays, talc, and aluminum hydroxide [18]. Thus, it can be chosen as the bonding phase in fabricating porous ceramics [20].…”