Resistance-free drying device and method for gelcasting of meter degree silicon carbide ceramic biscuit

Abstract

The invention discloses a resistance-free drying method and device for gelcasting of a meter degree silicon carbide ceramic biscuit. The method comprises the following steps that a drying tool is provided and comprises a panel, an outer frame and a back supporting plate; the drying tool and the silicon carbide ceramic biscuit are assembled, and silica gel is filled between the drying tool and thesilicon carbide ceramic biscuit; and the part, placed on the bottom surface, of the silicon carbide ceramic biscuit during the drying process of the silicon carbide ceramic biscuit is turned over andplaced on the above, the back support plate is disassembled, and silica gel between the silicon carbide ceramic biscuit and the back support plate is taken down; the back supporting plate is reinstalled, universal balls are fixed to the back supporting plate, the height is adjusted to enable the height to be in contact with the silicon carbide ceramic biscuit, and pre-tightening force is applied;the drying tool is used for overturning the part, placed on the bottom surface, of the silicon carbide ceramic biscuit in the drying process to be placed on the below, all the universal balls evenly bear the gravity of the silicon carbide ceramic biscuit; the panel is disassembled; and the outer frame, the back support plate and the silicon carbide ceramic biscuit are lifted into a drying liquid,and the silicon carbide ceramic biscuit is dried.

Description

technical field [0001] The invention belongs to the technical field of ceramic drying, and in particular relates to a non-resistance drying device and method for silicon carbide ceramic wet blanks with complex shapes above the meter level. Background technique [0002] The gelcasting process is currently the most advanced fine ceramic molding technology in the world. This method can realize the preparation of large-sized and complex-shaped ceramic green bodies. However, the ceramic wet body obtained by this technology has more water content (≥30%), and the uniform and slow drainage process is more difficult. Although the drying process of the gel injection molded ceramic wet body shrinks less (<1%), but For ceramic wet blanks with complex shapes above the meter level, the dimensional change has also reached the centimeter level. At the same time, due to the large self-weight of the large-diameter ceramic green body, the friction between the wet green body and the support...

AI Technical Summary

Problems solved by technology

However, the ceramic wet body obtained by this technology has more water content (≥30%), and the uniform and slow drainage process is more difficult. Although the drying process of the gel injection molded ceramic wet body shrinks less (<1%), but For ceramic wet blanks with complex shapes above the meter level, the dimensional change has also reached the centimeter level

At the same time, due to the large self-weight of the large-diameter ceramic green body, the friction between the wet green body and the support assembly is increased, and the free shrinkage of the wet green body is limited during the drying process. Therefore, the wet green body drying has always been the gelcasting method to prepare large-sized and complex-shaped ceramic green bodies. technical bottleneck

The invention proposes a non-resistance drying device and method for silicon carbide ceramic green body, combined with the invented drying process of silicon carbide ceramic green body of large size and complex shape by gel injection molding, solves the problem of silicon carbide ceramic green body with a diameter of 3 meters or more. Crack-free drying of ceramic green bodies

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