Abstract Porous ceramics have a wide range of applications in areas such as energy storage, heat transfer and sewage treatment. One of the common preparation methods of porous ceramics is photocuring 3D printing technology. However, many cracks inevitably appear on the surface of the porous ceramic skeleton after sintering. These cracks impair the mechanical properties and thermal conductivity of the porous ceramic skeleton, accelerate its corrosion rate, and limit its engineering applications. Therefore, methods to repair cracks on the surface of porous ceramics are urgently required. In this work, the green body of the porous ceramic skeleton was prepared by a liquid crystal display 3D printer. Two kinds of porous ceramic skeleton were prepared, either by high-temperature sintering in an inert atmosphere or by liquid silicon infiltration. The cracks on the surface of the two kinds of porous ceramic skeleton were repaired by impregnation followed by secondary sintering. After secondary sintering, a porous ceramic skeleton with superior performance was obtained. Experimental results showed that the porosity of porous ceramic skeleton after high-temperature sintering in an inert atmosphere and liquid silicon infiltration was 76.39 and 72.30, respectively. After the crack repair, the porosity of porous ceramic skeleton decreased by 4.64 and 4.33, respectively. However, the compressive stress of the porous ceramic skeleton increased by 12.78 times and 4.56 times, and the heat transfer efficiency increased by 15.38 and 12.12, respectively. Therefore, this study provides a method for crack repair on the surface of ceramic skeletons, which is of great significance for the improvement of mechanical properties and thermal conductivity of the porous ceramic skeleton.
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