Drying process of gelcasting large-sized and complex-shaped silicon carbide ceramic biscuit

Abstract

The invention provides a drying process of gelcasting large-sized and complex-shaped silicon carbide ceramic biscuit, which belongs to the field of ceramic drying technology and solves the shortcomings of easily cracking of and deformation of green bodies by adopting the existing ceramic wet green drying process. The process provided by the invention firstly prepares liquid ethanol and deionized water into drying solution with different concentration, then puts the SiC wet green into the bottom of a drying tank, respectively adds drying solution obtained by the step one into the drying tank for soaking to obtain the contracted SiC green body, and finally puts the contracted SiC green body in a drying oven for drying. The drying process provided by the invention greatly reduces the drying difficulty of large-sized and complex-shaped SiC biscuit, and achieves the non-defect drying of 1.5m-magnitude SiC ceramic biscuit prepared by a gelcasting process.

Description

technical field [0001] The invention belongs to the technical field of ceramic drying, and in particular relates to a drying process for forming a silicon carbide ceramic blank with a large size and complex shape by gel injection molding. Background technique [0002] Gel-casting technology is another new type of near-net size molding process following grouting molding and injection molding invented by M.A.Jenny and O.O.Omatete of Oak Ridge National Laboratory in the United States. This method can obtain a ceramic green body with excellent performance, but in the process of preparing a large-scale complex structure ceramic body, due to the large water content (volume ratio generally reaches 30-50%), large size and complex shape of the green body, so It increases the difficulty of drying the wet billet in the later stage, often due to excessive drying or uneven drying, there are many defects in the dry billet, which affects the performance of the final sintered body. [0003...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a drying process for gel injection molding of large-sized and complex-shaped silicon carbide ceramic blanks in order to solve the defects of the existing ceramic wet blank drying process that the blank is easy to crack and deform. Defect-free SiC ceramic dry billets with a diameter of 1.5m

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