Permeability and corrosion resistance of porous SiOC‐bonded SiC ceramics prepared by the preceramic polymer

Abstract

Porous SiC ceramics have been used in high temperature flue gas filtration fields because of their excellent properties such as high strength, high temperature resistance, corrosion resistance, and long service time. This work reports the porous SiOC-bonded SiC ceramics prepared at low temperature. The properties of porous SiC ceramics were first investigated with silicone resin content from 10 to 25 wt%, and then the effects of different pore-forming agent contents on the behaviors of porous SiC ceramics were discussed by adjusting poly (methyl methacrylate) PMMA microbeads from 5 to 20 wt%. The prepared porous SiC ceramics showed apparent porosity from 17.3% to 57.7%, compressive strength from 6 to 216 MPa, and Darcy permeability k 1 ranging from 7.02 × 10 −14 to 1.45 × 10 −12 m 2 . The corrosion behavior of porous SiC ceramics was investigated in acidic and alkaline media. The porous SiC ceramics showed better corrosion resistance in acidic solutions.

Microstructures, Mechanical Properties and Electromagnetic Wave Absorption Performance of Porous SiC Ceramics by Direct Foaming Combined with Direct-Ink-Writing-Based 3D Printing

“…The rapid increase in compressive strength also indicated that, when the sintering temperature was higher than 1450 °C, the liquid phase formed by the sintering aid facilitated the sintering process, whereby the SiC ceramic particles changed from their original loosely packed state and became tightly bound to each other. The mechanical properties of the porous SiC ceramics were also compared with those of other reported porous ceramics, as shown in Figure 11 [ 23 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 ]. It was demonstrated that the porosity and compressive strength of the porous SiC ceramics prepared by different methods differed widely, and the compressive strength decreased with the increase in porosity.…”

“… Comparison of the mechanical properties of porous SiC ceramics prepared by different methods [ 23 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 ]. …”

Ceramic Foams with Controlled Geometries Through 3D‐Printed Sacrificial Templates

“…[50][51][52][53][54][55][56][57][58][59][60][61][62][63][64][65] Porous SiOC-bonded SiC ceramics with apparent porosity between 17% and 58% were produced using silicon resin and PMMA microbeads (40-60 μm) as porogens for high-temperature gas filtration. [66] Furthermore, porous yttria-stabilized zirconia (YSZ) ceramics (%45%-72% porosity) were produced using monodispersed PMMA microbeads (%18 μm) as sacrificial pore-forming agent. [53] A challenge in fabricating porous ceramics is simultaneously controlling the porous microstructure (micrometer scale) and the geometry of the macrostructure (from millimeter to centimeter scale).…”

Effects of pore size on electrical and thermal properties of porous SiC ceramics

“…Owing to their unique combination of properties, such as excellent heat resistance, good mechanical properties, tunable thermal and electrical conductivities, excellent thermal shock and corrosion resistance, and high permeability, [1][2][3][4][5][6][7][8][9][10] porous SiC ceramics have been considered as one of the most promising filter materials for molten-metal filtration, particulate filtration, hot gas filtration, and wastewater filtration. [11][12][13] They are also good candidates for use as thermal insulators, catalyst supports, gas diffusers, sandwich materials for dual-coolant lead-lithium blankets, thermoelectric energy converters, and energy materials for other advanced applications.…”