Effect of inert filler addition on pore size and porosity of closed-cell silicon oxycarbide foams

Porosity control of porous silicon carbide ceramics

“…The heat treatment resulted in the conversion of polysiloxane to silicon oxycarbide. 23,24 The pyrolyzed specimens were further heated to 1450 • C and held at that temperature for 0.5 h in argon. This resulted in the carbothermal reduction of the polysiloxane-derived SiOC.…”

Defect and microstructural evolution during drying of soapnut-based alumina foams

“…In direct foaming process, major microstructural changes occur during consolidation of foamed slurry either by drying, gelling or freezing. [40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57][58] Foams processed by direct foaming of slurries have a tendency to develop defects such as cracks, delamination, warpage during drying. The capillary stress rise due to evaporation of water from the surface plays a role in formation of cracks.…”

Aligned continuous cylindrical pores derived from electrospun polymer fibers in titanium diboride

“…Sakka et al used polymer spheres as a sacrificial filler in a suspension, and they controlled the charge and zeta potential difference between the ceramic particles and the filler material to create a system where particles adhere to the filler material . However, in most of the instances where the sacrificial filler material is much larger than the ceramic particles in suspension, there is no specific description of the mechanism of interaction between fillers and particles . In the present work, the electrospun PS fibers did not have any pores, and therefore there were no issues with soaking of the fibers, and the ceramic particles fully surrounded the fibers, coating them completely without the need for further adjustment of the chemistry of the fibers or ceramic slurry.…”