Fabrication of high‐strength porous SiC‐based composites with unidirectional channels

Abstract

Carbon fiber reinforced SiC-based composites with unidirectional channels were obtained by freeze-casting and chemical vapor infiltration techniques, and their microstructure and fracture behavior were investigated. The results indicated that the sizes of the unidirectional channels could be controlled in the 15-70 μm range. The significant pseudo plastic and ductility features of the porous SiC-based composite were demonstrated during the fracture process. The strains of the composites reached 4 ± 1% and 50 ± 6% during bending and compressive experiments, respectively. The bending and compressive strengths, 123 ± 20 and 99 ± 15 MPa, respectively, were far superior to those of homogeneous ceramics presenting the same porosity. Combining the aforesaid method with 3D printing techniques, a SiC-based composite part with controlled macro-micro channels was fabricated, which indicated that this method could be useful for fabricating ceramic parts with complex structure and superior mechanical performance. K E Y W O R D Scarbon fibers, freeze-casting, mechanical properties, SiC-based composite

Parallel Structure Enhanced Polysilylaryl-enyne/Ca0.9La0.067TiO3 Composites with Ultra-High Dielectric Constant and Thermal Conductivity

“…With the increase in the ceramics content, the wavelength decreased slowly, while the ceramic walls became more complete and thicker (Figure ). The ceramic walls are formed by the impetus of water crystallization . With the increase in the ceramics content, the thermal conductivity of the system was enhanced, leading to the increase in supercooling and freezing velocity, which lowers the wavelength .…”

“…The ceramic walls are formed by the impetus of water crystallization. 35 With the increase in the ceramics content, the thermal conductivity of the system was enhanced, leading to the increase in supercooling and freezing velocity, which lowers the wavelength. 36 Meanwhile, with the increase in the ceramics content, more ceramic powder was available to build the ceramic wall, resulting in the ceramic walls becoming more complete and thicker.…”

Effect of Post-Oxidation Treatment on the Performance and Microstructure of Silicon Carbide Ceramic Membrane

“…They have been widely used in water treatments and material separation [2][3][4]. Typical ceramic membranes include alumina (Al 2 O 3 ), silicon nitride (Si 3 N 4 ), zirconia (ZrO 2 ), titania (TiO 2 ), and silicon carbide (SiC) [5][6][7][8][9]. Due to their high corrosion resistance, high-temperature resistance, and good hydrophilicity, SiC ceramic membranes have become one of the best solutions in oily wastewater, acidic and alkali wastewater, and caustic liquid treatments [10][11][12][13].…”