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Pressure forming method for sintering green pressing products under normal pressure

A technology of atmospheric pressure sintering and molding, which is applied in the field of molding of large-size green products of atmospheric sintered silicon carbide, can solve the problems of waste of resources, increased production costs, and low frequency of use, and achieves improved fluidity and improved Forming performance, uniform distribution effect

Active Publication Date: 2009-06-17
上海华硕精瓷陶瓷股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for ordinary small and medium-sized enterprises, it is a great burden to purchase a thousand-ton press, and the frequency of use is not very high, which causes a great waste of resources and increases production costs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0013] The compression molding method of the atmospheric pressure sintered silicon carbide green product of the present invention is carried out according to the following processing steps:

[0014] In the first step, in the prepared slurry, that is, the solid content of the slurry is about 65%, adding molding aids polyvinyl alcohol and polyethylene glycol according to 5-15% by mass and 3-12% by mass respectively, and Stir well;

[0015] The second step is to spray and granulate the slurry with a two-fluid spray granulation tower; first pour the slurry into the storage tank connected to the granulation tower and stir evenly, then pump the slurry out through the mud pump, and then use the spray gun Pour into the prilling tower; at the same time, inject high-pressure air with a pressure of 0.4-0.5MPa into the spray gun to break the powder into fine droplets and spray it to the top of the prilling tower. The hot air at 400-480°C evaporates the water in the small droplets, and th...

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PUM

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Abstract

A die pressing technology for preparing the raw SiC product to be sintered under ordinary pressure includes such steps as proportionally adding polyvinyl alcohol and polyethanediol to the prepared in die set, conventionally die pressing for 15-20 S, reversing the die set, die pressing for 15-20 S, and repeating the last two steps by 3-5 times.

Description

technical field [0001] The invention relates to a compression molding method of an atmospheric pressure sintered silicon carbide green body product, in particular to a compression molding method of an atmospheric pressure sintered silicon carbide large size green body product. Background technique [0002] Atmospheric pressure sintered silicon carbide is a new high-quality non-metallic material. It has high strength, high hardness, high temperature resistance, corrosion resistance, wear resistance and other characteristics. It is widely used in mechanical seals, automobiles, petrochemicals, aerospace, military, etc. field. It has been found through research and practice at home and abroad that if the atmospheric pressure sintered silicon carbide has the above characteristics, the firing density must reach 3.0g / cm 3 above. In order to make the firing density meet this requirement, it is necessary to make the compression molding density of the unfired green body reach 1.75g / ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B28B15/00B28C1/18B28B3/26
Inventor 蔡鸣
Owner 上海华硕精瓷陶瓷股份有限公司