A novel method has been developed for the fabrication of silicon nitride reticulated porous ceramics (RPCs) with regulated structure, using polyurethane sponge as the template. This technique includes two centrifuging steps. In the first stage, the polyurethane sponges are coated with thin slurry through high‐speed centrifuging. After the slurry on sponges dried, a high‐strength green body without filled cells is obtained. In the second stage, because of improved adhesion between the body and the slurry after the first coating, the body with uniformly thick strut is produced by recoating the as‐prepared green body with thixotropic slurry and centrifuging again. The loading content of slurry and the pore diameter of the RPCs body greatly depend on the slurry viscosity in the process of recoating. The strut diameter and pore diameter of the RPCs are effectively optimized by modulating the slurry viscosity.

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Herein, we report on the in situ reactive synthesis and simultaneous densification of a high-purity ternary Zr 3 Al 3 C 5 phase via pulse electric current sintering (PECS) of Zr/Al/graphite powder mixtures with a molar ratio of 3:3.2:4.8. The phases and microstructure evolution in the 580°C-1800°C temperature range were characterized by X-ray diffraction, real-time sintering curves, and a scanning electron microscope equipped with an energy dispersive spectroscope. An additive-free, fully dense Zr 3 Al 3 C 5 compound was obtained at 1800°C using a load corresponding to a stress of 35 MPa for 20 min. The final product was comprised of 96.61 wt% Zr 3 Al 3 C 5 , 3.14 wt% ZrC, and 0.25 wt% Zr 2 Al 3 C 4 ; the relative density was 97%.