Preparation method of 3D printing integral silicon carbide heat insulation shield

The invention discloses a preparation method of a 3D printing integral silicon carbide heat insulation shield. The method comprises the following steps: adding prepared ceramic slurry into a materialbarrel of a 3D printer, extruding the ceramic slurry into filamentous unit bodies, stacking layer by layer, and molding to obtain an integral heat insulation shield ceramic green body, wherein the first layer is an inner layer, the inner layer is an integral structure layer, the thickness of the inner layer is 5-15 mm, the inner wall of the inner layer is a main reflecting surface, the second layer is an auxiliary reflection layer, and the auxiliary reflection layer heat insulation layer is provided with convection gaps forming turbulent flow. According to the 3D printing integral silicon carbide heat insulation shield is prepared by the method, the printable heat insulation shield has a regular integral structure, a reflecting surface is formed on the polished inner surface, and high-temperature sintering polluti