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A 99% or more alumina granulated powder and its preparation method

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

Active Publication Date: 2018-06-19
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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  • A 99% or more alumina granulated powder and its preparation method
  • A 99% or more alumina granulated powder and its preparation method
  • A 99% or more alumina granulated powder and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 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 are ball milled for 46 hours, 2kg P-222 is added for 1.5 hours, 600g S-920 is ball milled for 0.5 hours, and the slurry is discharged. After the slurry is discharged, it is filtered with an 80-mesh screen, and the slurry enters the mixing tank Stir over a magnet.

[0021] 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.

[0022] 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 to make a billet by dry pressing metal mold forming method.

[...

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 for 40 hours of ball milling, 3kg of P-222 for 1 hour of ball milling, 500g of S-920 for 0.6 hours of ball milling, and then the slurry is discharged. After the slurry is discharged, it is filtered with an 80-mesh screen, and the slurry enters the mixing tank Stir over 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 to make a billet by dry press...

Embodiment 3

[0033] 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, 1kg of P-222 was added for 3 hours, 600g of S-920 was ball milled for 1 hour, and then 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 for further processing. Stir over a magnet.

[0034] 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.

[0035] 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 to make a b...

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Abstract

The invention relates to 99%-above alumina granulating powder and a preparation method thereof. The 99%-above alumina granulating powder comprises the following components in parts by weight: 100-200 parts of high-aluminum alumina balls, 50-150 parts of a calcined material CT-3000SG, 1-5 parts of a binder, 0.1-1 part of a dispersant, 0.1-1 part of a demolding agent, 0.1-1 part of yttria, 0.1-1 part of magnesia and 50-150 parts of deionized water. The preparation method comprises the following steps: carrying out ball milling, sieving after pulp is obtained, stirring, and processing with magnets; carrying out centrifugal spraying granulation; removing coarse and fine particles from granulated powder by virtue of a sieve, then removing iron and impurities, and finally homogenizing. The granulating powder is low in water content and high in apparent density; after blank molding, a green body is high in density, good in stability and tenacity and excellent in post-machining performance and does not easily collapse from corners; the preparation method is simple in process and 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 with an alumina content of more than 99% 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 powder, which ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/10C04B35/626
CPCC04B35/10C04B35/62605C04B35/6261C04B35/62695C04B2235/5427C04B2235/5436C04B2235/5463
Inventor 陶近翁陶岳雨闻俊生
Owner SHANGHAI COMPANION PRECISION CERAMICS
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