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

A technology of gel injection molding and shape silicon carbide, which is applied in the field of ceramic drying, can solve the problems of deformation and easy cracking of the green body, achieve the effect of easy transportation and storage, and reduce the difficulty of drying

Active Publication Date: 2013-01-23
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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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 or...

Method used

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

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Embodiment 1

[0040] SiC micropowder was provided by Shandong Weifang Huamei Fine Technology Co., Ltd., with a purity of 99.7%. The various chemical reagents used to prepare SiC wet body and configure dry liquid by gel injection molding process were provided by Beijing Chemical Reagent Co., Ltd. The actual purity was Analytical pure.

[0041] Mix absolute ethanol and deionized water, the concentration (volume ratio) is 10%, 20%, 30%, 40%, 60%, 80% and 100%, respectively, the formula is shown in Table 2, and then add the volume ratio 4% glycerol (glycerin) as a plasticizer to obtain dry solutions with different concentrations;

[0042] Table 2

[0043]

[0044] The Φ1.52m lightweight SiC wet billet was prepared by gel injection molding process, such as figure 1 and figure 2 As shown, put the wet billet into the drying tank, the bottom surface is supported by a porous aluminum plate, and the aluminum plate and the billet are separated by a long-pile carpet. It can greatly reduce the ...

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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...

Claims

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Application Information

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IPC IPC(8): C04B35/622C04B35/565
Inventor 赵文兴张舸赵汝成
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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