Preparation of Silicon Carbide Reticulated Porous Ceramics by Organic Foam Impregnation

Abstract

Silicon carbide (SiC) reticulated porous ceramics were prepared by organic foam impregnation, using polyurethane sponges as template and deionized water or alcohol as slurry solvent. The sintering behavior, microstructures and apparent density of struct of the SiC reticulated porous ceramics fabricated using the aqueous slurry under different sintering aids and sintering process and the alcohol slurry were investigated comparatively. The experimental results showed that both the microstructures and apparent density of the samples fabricated by Y2O3+AlN as sintering aid were better than those Al2O3 as sintering aid while the aqueous slurry, and the samples fabricated by two-step process (firstly heated to 700 oC in air furnace, and then sintered at 1800 oC in Ar atmosphere) while Y2O3+AlN as sintering aid obtained the optimal properties. In particular, the samples fabricated by the alcohol slurry and reaction sintering process were provided better properties than the aqueous slurry.

A Systematic Review on the Synthesis of Silicon Carbide: An Alternative Approach to Valorisation of Residual Municipal Solid Waste

“…The test results demonstrated that the apparent density and microstructure of the samples produced with Y 2 O 3 + AlN as a sintering aid were superior to those formed with Al 2 O 3 as a sintering aid. The samples generated using alcohol slurry provided optimal properties for the aqueous slurry [36].…”

Microstructure and properties of porous ceramics synthesized using Kubuqi desert sand

“…Finally, porous ceramics with good porosity can be obtained without adding additives. Compared with other material or process (adding pore-forming agent process [13], organic foam impregnation process [14], sol-gel process [15], freeze-drying process [16]), the pore size of porous ceramics synthesized from desert sand (from several microns to hundreds of microns) is much larger than these methods (smaller than tens of microns), which has advantages such as abundant raw materials, simple process route, adjustable porosity and good mechanical properties and can greatly reduce the synthesis cost and is suitable for low-cost and sustainable production of porous ceramics.…”