Injection molding process of alumina ceramics for spark plugs

An alumina ceramic and injection molding technology, which is applied in the field of ceramic parts manufacturing, can solve the problems of low density and difficult product performance of alumina ceramics, achieve high dimensional accuracy and surface finish, and reduce production costs

Inactive Publication Date: 2010-02-10
ZHUZHOU JINGTAI AUTO PARTS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The density of alumina ceramic products prepared by this technology is not high, and the product performance is difficult to compete with similar foreign products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1. Raw materials

[0024] Alumina ceramic powder (Al 2 O 3 , 99.9%), paraffin (PW, chemically pure), oleic acid (OA, chemically pure).

[0025] 2. Experimental process

[0026] Heat 1.2 kg of weighed liquid paraffin and 0.2 kg of oleic acid to about 100°C at the same time to melt completely until it is a clear solution. Add 10kg of 99.9% alumina ceramic powder to the above-mentioned melted materials slowly at one time, and mix them evenly with a mixer. After fully mixing, the mixture is pelletized in the extruder. Finally, the mixture is made into a length of about 2-4mm , A strip with a diameter of about 1-2mm to obtain granular materials suitable for injection molding. Injection molding is completed on the Haitian Tianxiang SA injection molding machine. The control injection conditions are: injection temperature 90℃, injection pressure 80KPa, injection time 10s, and screw down The time is 10s; the holding pressure is 25KPa, the holding time is 5s, and the cooling time is 1...

Embodiment 2

[0031] 1. Raw materials

[0032] Alumina ceramic powder (Al 2 O 3 , 99.9%), paraffin (PW, chemically pure), oleic acid (OA, chemically pure).

[0033] 2. Experimental process

[0034] Heat 1.2 kg of weighed liquid paraffin and 0.2 kg of oleic acid to about 90°C at the same time to melt it completely until it becomes a clear solution. Add 99.9% of alumina ceramic powder slowly to the above-mentioned melted material at one time, stir evenly with a mixer, and granulate the mixture in an extruder after fully mixing. Finally, the mixture is made into strips with a length of about 2-4mm and a diameter of about 1-2mm to obtain granular materials suitable for injection molding. The injection molding is completed on the Haitian Tianxiang SA injection molding machine. The control injection conditions are: injection temperature 88℃, The injection pressure is 60KPa, the injection time is 10s, and the screw down time is 10s; the holding pressure is 25KPa, the holding time is 5s, and the cooling...

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PUM

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Abstract

The invention discloses an injection molding process of alumina ceramics for spark plugs, which comprises the steps of proportioning, mixing materials, granulating, injection molding, degreasing, biscuit firing and high-temperature sintering. By improving the traditional injection molding technique, the process utilizes high-purity alumina powder as the raw material, optimizes molding parameters,such as injection temperature, injection pressure, pressure maintaining time and the like, and also uses the advanced low-temperature degreasing technique so as to prepare the alumina ceramics which are 99.9% transparent. The process has the advantages of high mechanization degree and automation degree; the molded ceramic products have very high dimensional precision and surface smoothness; and the sintered ceramic products do not require machining so as to obviously reduce the processing cost of ceramics.

Description

Technical field [0001] The technical field of ceramic parts manufacturing of the present invention specifically relates to an injection molding process of alumina ceramics for spark plugs. Background technique [0002] The spark plug is a starting device on some industrial equipment and automobile engines. Its core component-alumina ceramics, plays the role of insulation and high voltage arc resistance. Traditional alumina ceramics for spark plugs are prepared by isostatic pressing technology. The alumina ceramic products prepared by this technology are not dense, and the product performance is difficult to compete with similar foreign products. [0003] Ceramic injection molding technology (Ceramics Injection Molding, CIM) is developed on the basis of relatively mature polymer injection molding technology. Its outstanding advantages include: 1) The molding process is highly mechanized and automated; 2) It can form a variety of complex shapes of ceramic parts, so that the sintere...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/622C04B35/10B28B3/22
Inventor 赵学国郭佳军王忠
Owner ZHUZHOU JINGTAI AUTO PARTS
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