Degreasing method used for transparent alumina ceramic injection molding product

An alumina ceramic and injection molding technology, which is applied to ceramic molding machines and manufacturing tools, can solve the problems of long degreasing cycle, short degreasing cycle, and low degreasing rate, and achieve low defect rate, uniform degreasing, and improved degreasing rate. Effect

Inactive Publication Date: 2012-12-26
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] Aiming at the problems that the degreasing period of the existing thermal degreasing method is too long and the degreasing rate is low, the purpose of the present invention is to provide a degreasing method for injection molding of transparent alumina ceramics, which has a high degreasing rate and a short degreasing period

Method used

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  • Degreasing method used for transparent alumina ceramic injection molding product
  • Degreasing method used for transparent alumina ceramic injection molding product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A ceramic sample (transparent alumina ceramic green body for injection-molded metal halide lamp tubes) was prepared with 80% alumina and 20% binder and weighed. The weight percentage of the binder was 19% poly Propylene, 80% paraffin, 1% stearic acid.

[0030] The ceramic green body is immersed in the extraction solvent, in which the ratio of the ceramic green body volume to the solvent volume is 1:60; the extraction time is 3h, the extraction temperature is 45℃, and the extraction solvent is composed of 20% by volume. A mixture of alcohol and 80% n-heptane. Then, the extraction solvent is drained, and the ceramic green body is air-dried and weighed at room temperature to calculate the extraction rate.

[0031] The ceramic green body is buried in alumina powder with a particle size of 20-40 um, and the thermal degreasing is carried out according to the preferred temperature-rising curve of thermal degreasing and then weighed to calculate the degreasing rate.

[0032] The deg...

Embodiment 2

[0037] A ceramic sample was prepared with 80% alumina and 20% binder. The weight percentage of the binder was 19% polypropylene, 80% paraffin wax, and 1% stearic acid.

[0038] The ceramic green body is immersed in the extraction solvent, in which the ratio of the volume of the ceramic green body to the volume of the solvent is 1:80; the extraction time is 4h, the extraction temperature is 60℃, and the extraction solvent is composed of 20% by volume. A mixture of alcohol and 80% n-heptane.

[0039] After extraction, the extraction rate was measured to be 77.7%. After burying the extracted sample into powder and performing thermal degreasing according to the preferred thermal degreasing curve, the degreasing rate was determined to be 99.5%

Embodiment 3

[0041] The ceramic samples were prepared with 80% alumina and 20% binder. The weight percentage of the binder was 19% polypropylene, 80% paraffin wax, and 1% stearic acid.

[0042] The prepared ceramic green body is immersed in the extraction solvent, in which the ratio of the volume of the ceramic green body to the volume of the solvent is 1:80; the extraction time is 4h, the extraction temperature is 60℃, and the extraction solvent is composed of 30% by volume. A mixture of alcohol and 70% n-heptane.

[0043] After extraction, the extraction rate was measured to be 77.5%. After the extracted sample was buried in powder and subjected to thermal degreasing according to the preferred thermal degreasing curve, the degreasing rate was measured to be 99.3%

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Abstract

The invention relates to the field of the injection molding of transparent ceramics and ceramic powder, which discloses a degreasing method used for a transparent alumina ceramic injection molding product. The method comprises the following steps: firstly, injecting and molding a ceramic crude blank, wherein the assistant materials of the ceramic crude blank are alumina and an adhesive, and the adhesive comprises the following components by weight percent: 18-20% of polypropylene, 70-80% of paraffin and 1-12% of stearic acid; secondly, immersing the ceramic crude blank in an extraction solvent and extracting for 3-4h at the temperature of 45-60 DEG C, wherein the extraction solvent is prepared by mixing 20-30% of alcohol by volume and 70-80% of normal heptane by volume; then, discharging the extraction solvent and drying the ceramic crude blank in the air at room temperature; and finally, burying the ceramic crude blank in alumina powder and carrying out thermal degreasing for 56-60h hot.

Description

Technical field [0001] The invention relates to the field of transparent ceramics and ceramic powder injection molding, in particular to a degreasing method for transparent alumina ceramic injection molding. Background technique [0002] Transparent alumina ceramics are used for high-pressure sodium lamp tubes, high-temperature infrared detection windows, high-frequency insulating materials and integrated circuit substrate materials because of their good permeability to visible light and infrared light. However, most of the transparent ceramics currently used are dry pressing or cold isostatic pressing. These molding methods cannot form products with complex shapes, have low dimensional accuracy, and require subsequent processing. Therefore, they cannot be used for ceramic metal halide lamps. forming. [0003] Ceramic powder precision injection molding is a new molding technology that has developed rapidly internationally in the past 10 years. It can inject various ceramic parts ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/638C04B35/10B28B3/00
Inventor 鲍崇高乔冠军高丽丽张笑
Owner XI AN JIAOTONG UNIV
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