Cake forming method of high-purity alumina powder

A technology of high-purity alumina and molding method, applied in ceramic molding machines, manufacturing tools, etc., can solve the problems of friction pollution, uneven shape, etc., and achieve the effect of increasing the amount of charging, uniform shape and size, and uniform material

Active Publication Date: 2012-07-18
晶鑫晶体(内蒙古)科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is: the problem of friction pollution or uneven shape caused by the existing steel mold dry pressing and organic mold cold isostatic pressing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1 is the best embodiment of the present invention, and concrete processing steps are:

[0017] 1. Mix 10 kg of alumina powder with a purity of 99.997% and a particle size (D50) of about 2.0 to 3.0 μm and 8 kg of deionized water evenly.

[0018] 2. Put 100g of the mixed material into a special PP or PTFE mould, transfer the 100 parts of the mold filled with the material to a low-pressure machine for low-pressure compression, and the pressure is controlled at 20Mpa.

[0019] 3. Take out the cake materials and put them in food vacuum packaging bags respectively, and vacuum and seal them in a vacuum machine.

[0020] 4. Transfer these sealed cake materials to an isostatic press for cold isostatic pressing, the pressing pressure is 250Mpa, and the pressure is kept for 170s.

[0021] 5. The 100 cakes pressed by cold isostatic pressing are then sintered at high temperature. The sintering temperature is controlled at 1550° C. and the time is controlled at 5 hours. ...

Embodiment 2

[0024] The specific forming process steps of high-purity alumina cake are as follows:

[0025] 1. Mix 10kg of alumina powder with a purity of 99.997% and a particle size (D50) of about 2.0-3.0μm and 0.4kg of deionized water evenly.

[0026] 2. Put all the mixed materials into special PP or PTFE molds according to the amount of 100g per part, transfer the 100 parts of the molds filled with materials to a low-pressure machine for low-pressure compression, and the pressure is controlled at 1Mpa.

[0027] 3. Take out the cake materials and put them in food vacuum packaging bags respectively, and vacuum and seal them in a vacuum machine.

[0028] 4. Transfer the sealed cake materials to an isostatic press for cold isostatic pressing. The pressing pressure is 110Mpa and the pressure is kept for 35s.

[0029] 5. The 100 cakes pressed by cold isostatic pressing are then subjected to high-temperature sintering, the sintering temperature is controlled at 1400° C., and the time is 8 hou...

Embodiment 3

[0032] The specific forming process steps of high-purity alumina cake are as follows:

[0033] 1. Mix 10kg of alumina powder with a purity of 99.997% and a particle size (D50) of about 2.0-3.0μm and 1.6kg of deionized water evenly.

[0034] 2. Put 100g of the mixed material into a special PP or PTFE mould, transfer the 100 parts of the mold filled with the material to a low-pressure machine for low-pressure compression, and the pressure is controlled at 30Mpa.

[0035] 3. Take out the cake materials and put them in food vacuum packaging bags respectively, and vacuum and seal them in a vacuum machine.

[0036] 4. Transfer the sealed cake materials to an isostatic press for cold isostatic pressing. The pressing pressure is 350Mpa and the pressure is kept for 200s.

[0037] 5. The 100 cold isostatic pressed cakes are then sintered at high temperature, the sintering temperature is controlled at 1650°C, and the sintering time is 4H. After sintering, high-density high-purity alumi...

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Abstract

The invention relates to a cake forming method of high-purity alumina powder, belongs to the technical field of chemical machining forming methods, and in particular to an alumina cake forming method. The cake forming method comprises the steps of preforming, vacuum sealing, isostatic cool pressing, high-temperature sintering and the like. According to the invention, a mould made of a PP or tetra fluorine material is adopted, pollution caused by high-purity alumina by the traditional steel mould is avoided, a preformed cake obtained by through low-pressure pressing can ensure that the cake in the later-stage isostatic cool pressing does not easily deform like the original organic mould due to a certain strength, thus the cake with uniform material and enough density is obtained. The cake subjected to the isostatic cool pressing has unchangeable purity after being sintered, and has uniform shape and size and density of commonly reaching 3.0-3.7g/cm<3>. The loading quantity during producing and loading of a downstream manufacturer of sapphire can be effectively increased.

Description

technical field [0001] The invention discloses a method for forming a cake of high-purity alumina powder, which relates to the technical field of chemical powder processing and forming methods, in particular to a method for forming an alumina cake. Background technique [0002] At present, among domestic manufacturers of high-purity alumina cakes, most of them use steel molds for direct molding or cold isostatic pressing with polyurethane or rubber organic molds. The above two methods may cause friction pollution. In alumina, or after cold isostatic pressing, the shape and size are different, which leads to insufficient loading of downstream manufacturers such as sapphire. The invention adopts a step-by-step forming method, and uses PP or PTFE molds to not only ensure that the product is not polluted, but also to make cakes with uniform sizes. Contents of the invention [0003] The technical problem to be solved by the invention is: frictional pollution or uneven shape ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B28B3/02C04B35/10C04B35/622
Inventor 宋军
Owner 晶鑫晶体(内蒙古)科技有限公司
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