Device and method for non-resistance drying of rice-grade silicon carbide ceramic green body by gel injection molding

Abstract

The invention discloses a non-resistance drying method and device for forming a rice-grade silicon carbide ceramic green body by gel injection molding. The method includes: providing a drying tool, including a panel, an outer frame and a back support plate; Assemble, and fill with silica gel between the two; use the drying tool to turn over the part placed on the bottom surface of the silicon carbide ceramic green body during the drying process and place it on the top, remove the back support plate, and remove the silicon carbide ceramic green body and the back support plate. Silica gel in between; reinstall the back support plate, fix the universal ball to the back support plate, adjust the height to make it contact with the silicon carbide ceramic green body, and apply pre-tightening force; use the drying tool to dry the silicon carbide ceramic green body The part placed on the bottom surface is turned over and placed below, so that all universal balls bear the gravity of the silicon carbide ceramic green body evenly; remove the panel; hang the outer frame, back support plate and silicon carbide ceramic green body into the drying liquid, and the silicon carbide ceramic green body The 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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