Method for manufacturing dentate special-shaped ceramic components by injection molding

An injection molding and ceramic technology, applied in the direction of manufacturing tools, ceramic molding machines, etc., can solve the problems of difficulty, cracking and deformation, and long time of multi-tooth-shaped special-shaped ceramic products, and achieves a small amount of machining, no deformation and cracking. Defects, uniform dispersion effect

Inactive Publication Date: 2010-02-10
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the past, ceramic injection molding mainly used the method of slow heating for degreasing, so that the decomposition of the organic binder was gradually eliminated. It took dozens of hours or even more than 100 hours. , so the application of ceramic injection molding is limited, especially it is very difficult to prepare multi-tooth shaped ceramic products

Method used

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  • Method for manufacturing dentate special-shaped ceramic components by injection molding
  • Method for manufacturing dentate special-shaped ceramic components by injection molding
  • Method for manufacturing dentate special-shaped ceramic components by injection molding

Examples

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Embodiment 1

[0033] In this embodiment, the ceramic powder is made of zirconia ceramic powder, and the average particle size of the zirconia powder is d 50 =0.15μm, the specific surface area is 8.5m 2 / g, the organic binder is composed of a water-insoluble binder, a water-soluble binder, a surfactant, a low melting point organic matter and a plasticizer, and the water-insoluble binder is polyethylene terephthalate Combination with polymethyl methacrylate, polyethylene glycol as water-soluble binder, stearic acid as surfactant, dibutyl terephthalate as plasticizer, microcrystalline paraffin as low Melting point organics.

[0034] The steps of the method for manufacturing tooth-shaped special-shaped ceramic parts by injection molding are as follows, and the process flow is shown in figure 2 :

[0035] (1) Mix ceramic powder and organic binder: add 1000g zirconia ceramic powder, 12.4g polyethylene terephthalate, and 22.9g polymethyl methacrylate to a double-roll mill, at 190 Mix at 10°C ...

Embodiment 2

[0044] In this embodiment, alumina ceramic powder is selected as ceramic powder, and the average particle diameter of alumina powder is d 50 =0.08μm, the specific surface area is 13.5m 2 / g, the organic binder is composed of a water-insoluble binder, a water-soluble binder, a surfactant, a low melting point organic matter and a plasticizer, and the water-insoluble binder is polyethylene terephthalate Combination with polyvinyl butyral, polyethylene glycol as water-soluble binder, stearic acid as surfactant, dibutyl terephthalate as plasticizer, microcrystalline paraffin as low Melting point organics.

[0045] The steps of the method for manufacturing tooth-shaped special-shaped ceramic parts by injection molding are as follows:

[0046] (1) Mix ceramic powder and organic binder: add 1000g alumina ceramic powder, 11.0g polyethylene terephthalate, and 33.0g polyvinyl butyral to a double-roll mill, Mixing at ℃ for 10 minutes; the temperature dropped to 170℃, added 8.8g of stea...

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Abstract

The invention discloses a method for manufacturing dentate special-shaped ceramic components by injection molding, belonging to the technical field of high-performance ceramic preparation. The methodcomprises the following steps: evenly mixing 81wt% to 90wt% of ceramic powder and 10wt% to 19wt% of organic binders by weight percentage to obtain an injection-molding mixture, injection-molding the injection-molding mixture on an injection-molding machine with the injection temperature being 175 to 195 DEG C, to obtain a green body, and de-molding within 2 minutes after the injection, so as to obtain a molded green body; and then, subjecting the molded green body to water-extraction degreasing and thermal degreasing, sintering the degreased green body at 1,350 to 1,550 DEG C, holding for 1 to4 hours and furnace-cooling to obtain the ceramic components. The invention has the advantages of high automation degree, high molding and degreasing efficiencies, even green body, high dimensional accuracy and surface smoothness of sintered products, and environment-friendly and energy-saving manufacture.

Description

technical field [0001] The invention belongs to the technical field of high-performance ceramic preparation, and in particular relates to a method for manufacturing tooth-shaped special-shaped ceramic parts by injection molding. Background technique [0002] Multi-tooth oxide ceramic components are widely used in the fields of machinery, chemical industry and automobile, such as zirconia or alumina ceramic gears and ceramic spirals. Current methods for manufacturing such multidentate oxide ceramic components include isostatic pressing, dry pressing, slip casting, and hot die casting. Although ceramic dry pressing has high efficiency, there are differences in density and uneven microstructure in the formed products, and it is not easy to form complex shapes and special-shaped products; cold isostatic pressing can obtain high-density and high-uniformity forming blanks , but it is difficult to form ceramic parts with complex shapes, and the forming efficiency is low and manual...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/632C04B35/634C04B35/10C04B35/48C04B35/185B28B3/20B28B11/24
Inventor 谢志鹏杨现锋曾兴华曾国华贾翠刘伟
Owner TSINGHUA UNIV
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