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More than 99% alumina granulated powder for cold isostatic pressing and preparation method thereof

A technology for alumina and granulated powder, applied in the field of alumina ceramics, can solve the problems of poor post-processing performance and low green density, and achieve good application prospects, low cost, and good toughness.

Active Publication Date: 2017-12-15
SHANGHAI COMPANION PRECISION CERAMICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to the current process, the density of the green body after the powder is made is not high, and the post-processing performance is not good.

Method used

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  • More than 99% alumina granulated powder for cold isostatic pressing and preparation method thereof
  • More than 99% alumina granulated powder for cold isostatic pressing and preparation method thereof
  • More than 99% alumina granulated powder for cold isostatic pressing and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The ball mill adopts an octagonal ball mill. Put 150Kg of high-alumina alumina balls (specifications Φ6, Φ8, Φ12 (mm) according to the mass ratio of 3:3:4) in the barrel, and put 100KgCT-3000SG, 50Kg deionized water, 200g Yttrium oxide, 400g magnesium oxide, 600g D-134 were ball milled for 46 hours, and 2kg P-222 was added for ball milling for 1.5 hours before the slurry was discharged. After the slurry was discharged, it was filtered with an 80-mesh screen, and the slurry was put into the mixing tank and stirred through the magnet.

[0020] Start the centrifugal spray granulator, set the inlet temperature to 220°C, the outlet temperature to 95°C, the rotation speed to 15000rpm, and the negative pressure to 120pa.

[0021] The granulated powder is sieved with 60 mesh and 325 mesh to remove coarse and fine particles. The powder must be iron-removed to remove impurities, and the powder is homogenized for 24 hours using a cold isostatic rubber mold to make a billet.

[002...

Embodiment 2

[0026] The ball mill adopts an octagonal ball mill. Put 100Kg of high-alumina alumina balls of more than 99% in the bucket (specifications Φ6, Φ8, Φ12 (mm) according to the mass ratio 3:3:4), and put in 50Kg CT-3000SG, 80Kg deionized water, 400g of yttrium oxide, 800g of magnesia, 200g of D-134 were ball milled for 40 hours, and 3kg of P-222 was added for ball milling for 1 hour before the slurry was discharged. After the slurry was discharged, it was filtered with an 80-mesh screen, and the slurry was put into a mixing tank for stirring through a magnet.

[0027] Start the centrifugal spray granulator, set the inlet temperature to 220°C, the outlet temperature to 95°C, the rotation speed to 15000rpm, and the negative pressure to 120pa.

[0028] The granulated powder is sieved with 60 mesh and 325 mesh to remove coarse and fine particles. The powder must be iron-removed to remove impurities, and the powder is homogenized for 28 hours using a cold isostatic rubber mold to make a...

Embodiment 3

[0032] The ball mill adopts an octagonal ball mill. Put 150Kg of high-alumina alumina balls above 99% in the bucket (specifications Φ6, Φ8, Φ12 (mm) according to the mass ratio 3:3:4), and put 150Kg CT-3000SG, 150Kg deionized water, 100g of yttrium oxide, 200g of magnesia, 600g of D-134 were ball milled for 50 hours, and 1kg of P-222 was added for ball milling for 3 hours before the slurry was discharged. After the slurry was discharged, it was filtered with an 80-mesh screen, and the slurry was put into a mixing tank and stirred through a magnet.

[0033] Start the centrifugal spray granulator, set the inlet temperature to 220°C, the outlet temperature to 95°C, the rotation speed to 15000rpm, and the negative pressure to 120pa.

[0034] The granulated powder is sieved with 60 mesh and 325 mesh to remove coarse and fine particles. The powder must be iron-removed to remove impurities, and the powder is homogenized for 36 hours using a cold isostatic rubber mold to make a billet....

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Abstract

The invention relates to a 99% or more alumina granulated powder for cold isostatic pressing and a preparation method thereof. The components include: in parts by mass, 100 to 200 parts of high-alumina alumina balls, calcined material CT‑ 50-150 parts of 3000SG, 1-5 parts of binder, 0.1-1 part of dispersant, 0.1-1 part of yttrium oxide, 0.1-1 part of magnesium oxide and 50-150 parts of deionized water. The preparation method comprises the following steps: ball milling, sieving after pulping, and stirring with a magnet; then performing centrifugal spray granulation; using a sieve to remove coarse and fine particles from the granulated powder, removing iron to remove impurities, and finally homogenizing. The powder of the present invention has low water content, high bulk density, high green density after billet making, good stability, good toughness, not easy to chipping, and excellent post-processing performance; the preparation method is simple in process, low in cost, and has good application prospect.

Description

technical field [0001] The invention belongs to the field of alumina ceramics, and in particular relates to a granulated powder of more than 99% alumina for cold isostatic pressing and a preparation method thereof. Background technique [0002] Alumina ceramics have a series of characteristics such as high mechanical strength, high volume resistivity, good electrical insulation, high strength, wear resistance, and oxidation resistance. It is widely used as structural parts and functional device porcelain parts, such as wear-resistant and corrosion-resistant components in the field of mechanization and chemical industry, crucible protection tubes, refractory materials used in metallurgical industry, substrate insulators, radar radomes, microwave electrolytes and other electronic industry porcelain parts. At present, in the dry pressing molding or isostatic pressing molding of alumina ceramics production process, the ceramic slurry needs to be spray-dried to form a granular po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/10C04B35/626
Inventor 陶近翁陶岳雨闻俊生
Owner SHANGHAI COMPANION PRECISION CERAMICS
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