Gelcasting of Ceramic Bodies

Closed porosity ceramics and glasses

“…It is important to note that gel casting is a different process than sol‐gel in which ceramic precursors are integral to the gelling process via hydrolysis, polycondensation, etc While many studies were focused on gel casting, few others investigated the preparation of a sol‐gel to cast and gelation freezing . Although, gel casting is facile and flexible technique to produce a wide variety of geometries and can be adapted to traditional ceramic forming industry with no requirement of new instrumentation, the method uses high number of noneconomic and environmentally unfriendly chemicals.…”

“…29,[42][43][44] The resulting components usually had mixed pore type (open & closed) but characteristically having spherical cells interconnected by narrow circular windows, that is resembling those of closed porosity components when properties are considered. [42][43][44][45][46][47] It is important to note that gel casting is a different process than sol-gel in which ceramic precursors are integral to the gelling process via hydrolysis, polycondensation, etc 48 While many studies were focused on gel casting, few others investigated the preparation of a sol-gel to cast 49,50 and gelation freezing. 51 Although, gel casting is facile and flexible technique to produce a wide variety of geometries and can be adapted to traditional F I G U R E 5 SEM micrographs of (A) soda-lime glass microspheres, bonded with 4 wt% mono-aluminum phosphate and fired at 300°C for 3 h, (B) close magnification demonstrating the neck formation (Reproduced from 24 with permission Springer Nature, Copyright 1985) ceramic forming industry with no requirement of new instrumentation, the method uses high number of noneconomic and environmentally unfriendly chemicals.…”

A Finite Element Analysis for Improvement of Shaping Process of Complex-Shaped Large-Size Silicon Carbide Mirrors

“…The homogenous distribution of the polymer using the gel-casting technique contributes to the higher strength of the SiC materials. So far, many examples involved in the application of the gel casting in forming silicon carbide green samples can be found in the reported literature [ 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 ]. Tian et al [ 24 ] successfully prepared the SiC ceramics using the gel-casting process and proposed a pretreatment and surface modification method to avoid the problem that Isobam is difficult to crosslink and gelling with non-oxide ceramics.…”