Degreasing method used for transparent alumina ceramic injection molding product

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

Inactive Publication Date: 2010-04-28
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • 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
  • Degreasing method used for transparent alumina ceramic injection molding product

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Adopt 80% alumina and 20% binder to prepare ceramic sample (transparent alumina ceramic green body of injection molding metal halide lamp tube) and weigh, wherein the weight percent component of binder is 19% poly Propylene, 80% paraffin, 1% stearic acid.

[0030] Submerge the prepared ceramic green body in the extraction solvent, wherein the ratio of the volume of the ceramic green body to the volume of the solvent is 1:60; the extraction time is 3 hours, the extraction temperature is 45°C, and the extraction solvent consists of 20% by volume Alcohol mixed with 80% n-heptane. Then, the extraction solvent was drained, and the ceramic green body was air-dried at room temperature and weighed to calculate the extraction rate.

[0031] Embed the ceramic green body in alumina powder with a particle size of 20-40um, perform thermal degreasing according to the preferred temperature rise curve of thermal degreasing, weigh it, and calculate the degreasing rate.

[0032] The de...

Embodiment 2

[0037] A ceramic sample was prepared by adopting 80% of alumina and 20% of binder, wherein the components in weight percent of binder were 19% of polypropylene, 80% of paraffin, and 1% of stearic acid.

[0038] Submerge the prepared ceramic green body in the extraction solvent, wherein the ratio of the volume of the ceramic green body to the volume of the solvent is 1:80; the extraction time is 4 hours, the extraction temperature is 60°C, and the extraction solvent is composed of 20% by volume Alcohol mixed with 80% n-heptane.

[0039] After extraction, the extraction rate was measured to be 77.7%. After the extracted sample was buried in powder and thermally degreased according to the preferred thermal degreasing curve, the degreasing rate was measured to be 99.5%.

Embodiment 3

[0041] A ceramic sample was prepared by adopting 80% of alumina and 20% of binder, wherein the components in weight percent of binder were 19% of polypropylene, 80% of paraffin, and 1% of stearic acid.

[0042] Submerge the prepared ceramic green body in the extraction solvent, wherein the ratio of the volume of the ceramic green body to the solvent volume is 1:80; the extraction time is 4 hours, the extraction temperature is 60°C, and the extraction solvent is composed of 30% by volume Alcohol mixed with 70% n-heptane.

[0043] After extraction, the extraction rate was measured to be 77.5%. After the extracted sample was buried in powder and thermally degreased 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 injection molding of transparent alumina ceramics. Background technique [0002] Transparent alumina ceramics are used in 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 used at present are formed by dry pressing or cold isostatic pressing. These forming methods cannot form products with complex shapes, the dimensional accuracy is not high, and subsequent processing is required. Therefore, they cannot be used for ceramic metal halide lamp tubes. forming. [0003] Ceramic powder precision injection molding is a new molding technology that has developed rapidly in the world in the past 10 years. I...

Claims

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Application Information

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Patent Type & Authority Applications(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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