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Gel injection molding technology of large-sized and complicated-shape silicon carbide ceramic biscuit

A technology for gel injection molding and shape silicon carbide, which is applied in the field of gel injection molding technology to achieve the effects of tight packing, increased content and consistent drying

Inactive Publication Date: 2012-02-08
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Application Information

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Problems solved by technology

[0004] The invention solves many technical difficulties in the process of preparing large-sized and complex-shaped SiC green bodies by using the gel injection molding process, and realizes the preparation of SiC ceramic green bodies with complex shapes in the order of 1m

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  • Gel injection molding technology of large-sized and complicated-shape silicon carbide ceramic biscuit
  • Gel injection molding technology of large-sized and complicated-shape silicon carbide ceramic biscuit
  • Gel injection molding technology of large-sized and complicated-shape silicon carbide ceramic biscuit

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Embodiment Construction

[0018] The present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0019] SiC powder is provided by Shandong Weifang Huamei Fine Technology Ceramics Co., Ltd., with a median diameter of d 50 They are 0.5μm, 10μm and 40μm, respectively, with a purity of 99.7%. Various chemical reagents used in the preparation process are provided by Beijing Chemical Reagent Co., Ltd., all of which are analytically pure.

[0020] according to figure 1 The gel injection molding process flow chart of the large-size and complex-shaped silicon carbide ceramic green body shown, the process of the specific embodiment is as follows:

[0021] Dissolve 75g of acrylamide and 5g of methylenebisacrylamide in 301.7ml of deionized water, add 7ml of glycerol and 2ml of isopropanol, and add 14ml of tetramethylammonium hydroxide to adjust the pH of the premix to about 11.5 .

[0022] Add 2640g of SiC powder to the premix, the weight ratios of the three parti...

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Abstract

The invention relates to a gel injection molding technology of a large-sized and complicated-shape silicon carbide ceramic biscuit, belonging to the technical field of a material preparation. In the technology, the large-sized and complicated-shape SiC ceramic biscuit can be prepared by seven steps of preparing premixing liquid, preparing slurry, defoaming the slurry, adding an initiating agent and a catalyst, injecting and molding, drying a biscuit body and degreasing the biscuit. The invention can ensure that a plurality of technological difficulties of difficult preparation of high-solid-phase content slurry, difficult gelation time control of the slurry, difficult demolding and drying and the like in the course of preparing the large-sized and complicated-shape SiC ceramic biscuit by adopting the gel injection molding technology are solved; and the preparation of the complicated-shape SiC ceramic biscuit of 1m of magnitude order is realized.

Description

Technical field [0001] The invention belongs to the technical field of material preparation, and relates to a gel injection molding process of a large-size and complex-shaped silicon carbide (SiC) ceramic green body. The method can be used to prepare a 1m-level complex-shaped monolithic SiC ceramic green body. Background technique [0002] SiC ceramic is a ceramic material with high specific rigidity, low thermal expansion coefficient, high thermal conductivity, and a good polished surface. Therefore, it is a very ideal matrix material for space reflectors, but it is prepared by large-size and complex-shaped SiC ceramic blanks. It is very difficult. At present, researchers in various countries have developed a variety of ceramic molding processes to prepare large-scale and complex-shaped SiC blanks. Among them, the gel-casting process, as the most advanced ceramic molding technology, is more and more popular. Favor. [0003] Gel-casting technology is a new type of near-net-size mo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B28B1/14
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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