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Isostatic cool pressing molding die for ceramic tube and molding method

A technology of cold isostatic pressing and ceramic tubes, which is applied in the direction of ceramic molding machines, molds, manufacturing tools, etc., can solve the problem that the tubular ceramic parts cannot be completely isostatic pressed, and achieve the solution of green body density gradient and small sintering deformation , The effect of uniform density of green body

Inactive Publication Date: 2018-08-07
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Based on the characteristic that the tubular ceramic parts cannot be completely isostatically pressed, the present invention specifically invents a cold isostatic pressing molding die and a forming method, realizes the complete isostatic pressing of the tubular ceramic green body, and solves the problem of large size , Key preparation issues of large thickness tubular ceramics

Method used

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  • Isostatic cool pressing molding die for ceramic tube and molding method
  • Isostatic cool pressing molding die for ceramic tube and molding method

Examples

Experimental program
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Effect test

Embodiment 1

[0048] A solid-phase sintered SiC ceramic tube with an outer diameter of 650 mm, an inner diameter of 615 mm, and a height of 500 mm was prepared, and the average particle size of the powder was 90 μm. According to the sintering shrinkage rate of ceramics and the compression shrinkage rate of loose powder, according to figure 1 Design and make molds. Put the lower mold sleeve made of nitrile rubber into the steel mold, vibrate while feeding, and the vibration frequency is 50Hz. After filling the powder, install the upper mold cover made of nitrile rubber and seal it with a wire rope. Carry out vacuum pumping through the pumping hole for 30 minutes, and close the vacuum valve after the vacuum degree reaches 1 mbar. After holding the pressure for 60 minutes, the vacuum still reached 2mbar. Take out the sealed mold sleeve from the steel mold and put it into an isostatic press for 200MPa isostatic pressure treatment. After pressing, the mold cover is taken out to obtain a cera...

Embodiment 2

[0050] A solid-phase sintered SiC ceramic tube with an outer diameter of 463 mm, an inner diameter of 443 mm, and a height of 500 mm was prepared, and the average particle size of the powder was 50 μm. According to the sintering shrinkage rate of ceramics and the compression shrinkage rate of loose powder, according to figure 1 Design and make molds. Put the lower mold sleeve made of natural rubber into the steel mold, vibrate while feeding, and the vibration frequency is 100Hz. After the powder is filled, install the upper mold cover made of natural rubber and seal it with a rubber ring. Carry out vacuum pumping through the pumping hole for 60 minutes, and close the vacuum valve after the vacuum degree reaches 5 mbar. After holding the pressure for 60 minutes, the vacuum degree still reaches 8mbar. Take out the sealed mold sleeve from the steel mold and put it into an isostatic press for 200MPa isostatic pressure treatment. After pressing, the mold cover is taken out to o...

Embodiment 3

[0052] A liquid-phase sintered SiC ceramic tube with an outer diameter of 1540 mm, an inner diameter of 1500 mm, and a height of 600 mm was prepared, and the average particle size of the powder was 0.6 μm. According to the sintering shrinkage rate of ceramics and the compression shrinkage rate of loose powder, according to figure 1 Design and make molds. Put the lower mold sleeve made of polyurethane rubber into the steel mold, vibrate while feeding, and the vibration frequency is 100Hz. After the powder is filled, install the upper mold cover made of polyurethane rubber and seal it with a rubber ring. Carry out vacuum pumping through the pumping hole for 60 minutes, and close the vacuum valve after the vacuum degree reaches 5 mbar. After holding the pressure for 60 minutes, the vacuum degree still reaches 8mbar. Take out the sealed mold sleeve from the steel mold and put it into an isostatic press for 200MPa isostatic pressure treatment. After pressing, the mold cover is ...

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Abstract

The invention provides a isostatic cool pressing molding die for a ceramic tube and a molding method. The isostatic cool pressing molding die comprises a steel die and a die sleeve die, wherein the steel die comprises an inner steel die and an outer steel die; a die sleeve is arranged between the inner steel die and the outer steel die, and is divided into an upper die sleeve and a lower die sleeve; the length of the upper die sleeve is the same as that, higher than the steel die, of the lower die sleeve; an exhaust tube arranged on the die sleeve to vacuumize the interior of the die sleeve isprovided; and a cavity filled with ceramic powder is reserved between the lower die sleeve and the upper die sleeve.

Description

technical field [0001] The invention relates to a cold isostatic pressing forming mold and a forming method of a ceramic tube. Background technique [0002] Isostatic pressing is to put the powder in the mold to achieve a certain initial density through vibration or proper extrusion, so that it has a fixed shape and seal it, and then put it in the high-pressure chamber of the isostatic press. The static pressure of the liquid pressure medium is transferred to the powder through the mold to realize isostatic pressing. The isostatic pressing mold needs to transmit static pressure through deformation to realize the isostatic pressing of powder, so it is usually made of elastic rubber material or engineering plastic. [0003] Cold isostatic pressing molding (cold isostatic pressing molding) is to place the rubber film filled with powder in a closed container, apply equal pressure in all directions through an oil pump, and obtain a dense green body under the action of high press...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B28B3/00B28B21/76
CPCB28B3/003B28B21/76
Inventor 黄毅华黄政仁刘学建陈忠明刘雷敏蒋金弟张健王凯伦王勇左俊杰
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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