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Method of preparing alumina ceramic prilling powder for sealed ring

A technology of alumina ceramics and granulated powder, which is applied in the field of preparation of alumina ceramic granulated powder for sealing rings, which can solve the problems of increasing huge costs and achieve the effects of reasonable particle size distribution, moderate strength and high density

Active Publication Date: 2009-04-15
ZHENGZHOU HICER HIGH TECH CERAMICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using commercially available ordinary alumina ceramic granulation powder, through the follow-up unconventional processing technology, although products that meet the requirements can be prepared, the huge increased cost is far beyond the affordability of the company.

Method used

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Effect test

preparation example Construction

[0013] A method for preparing alumina ceramic granulated powder for sealing rings, the preparation process comprising:

[0014] (1) Weigh α-alumina, silicon micropowder, light calcium carbonate, kaolin, calcined talc magnesia and yttrium oxide as ingredients, dry grind, pulverize and mix evenly. 99%, silicon micropowder 0-2.5%, light calcium carbonate 0-2%, kaolin 0-3%, calcined talc magnesium oxide 0.6%-3%, yttrium oxide 0.3%-0.5%;

[0015] (2) Place the above-mentioned uniformly mixed powder in a ball mill, dilute with pure water at a weight ratio of 1:0.8, and add dispersant, binder and release agent according to the composition, and ball mill to make a slurry; add The dispersant is 0.4% to 0.6% of the total weight of the ingredients, the binder is 1.2% to 2.0% of the total weight of the ingredients, and the release agent is 0.5 to 1.0% by weight of the total weight of the ingredients;

[0016] (3) The slurry made by the ball mill is passed through a 100-mesh sieve, and ir...

Embodiment 1

[0020] Raw material composition: α-Al 2 o 3 Micropowder 90%, silicon micropowder 2.5%, light calcium carbonate 2%, kaolin 3%, burnt talc 2%, yttrium oxide 0.5%.

[0021] Weigh, dry grind and mix uniformly according to the above composition requirements. Place the uniformly mixed powder in a ball mill, dilute with pure water at a weight ratio of 1:0.8, add 0.6% dispersant, 1.3% binder and 0.5% release agent, and ball mill for 24 hours to make a slurry. Pass the above-mentioned slurry through a 100-mesh sieve and remove iron, spray and granulate through a spray drying tower, the pump feed pressure is 1.8-2.2MPa, the inlet temperature is 350-380°C, and the outlet temperature is 105-120°C. Put the spray granulation powder in a mixer and mix for 0.5 hours, pass through 40 mesh and 200 mesh sieves, take the powder between the two layers of sieves, inspect, pack and store.

Embodiment 2

[0023] Raw material composition: α-Al 2 o 3 Micropowder 93.5%, silicon micropowder 1%, light calcium carbonate 1.5%, kaolin 2%, burnt talc 1.5%, yttrium oxide 0.5%.

[0024] Weigh, dry grind and mix uniformly according to the above composition requirements. Place the uniformly mixed powder in a ball mill, dilute with pure water at a weight ratio of 1:0.8, add 0.5% dispersant, 1.5% binder and 0.5% release agent, and ball mill for 24 hours to make a slurry. Pass the above-mentioned slurry through a 100-mesh sieve and remove iron, spray and granulate through a spray drying tower, the pump feed pressure is 1.8-2.2MPa, the inlet temperature is 350-380°C, and the outlet temperature is 105-120°C. Put the spray granulation powder in a mixer and mix for 0.5 hours, pass through 40 mesh and 200 mesh sieves, take the powder between the two layers of sieves, inspect, pack and store.

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Abstract

The invention relates to a preparation method for alumina ceramic granulated powder used by a sealing ring, which is characterized in that the preparation process comprises: (1) weighting and mixing alpha alumina, silicon powder, light calcium carbonate, kaolin, burning talc magnesia and yttria, carrying out dry milling, crashing and uniformly mixing; (2) placing the uniformly mixed powder in a ball mill, diluting, adding a dispersant, a binder and a release agent and milling into slurry; (3) screening the milled slurry, removing iron, putting in a spray drying tower to carry out spray granulation; and (4) screening the spray granulated powder by a 40-mesh screen and a 200-mesh screen, taking the powder between the two screens as the finished product. The granulated powder prepared by the method of the invention has the advantages of solid granule, reasonably distributed granularity, large loose packed density, moderate strength, good fluidity and easy mold release. Moreover, the alumina sealing ring can be provided with microcrystalline structure only through the common dry pressing and sintering technology. The ceramic article has high tightness, and the surface of which has no pores found when being amplified by 20 times after abrasive polishing.

Description

technical field [0001] The invention relates to a preparation method of alumina ceramic granulated powder for sealing rings. Background technique [0002] Alumina ceramics are widely used in the sealing ring manufacturing industry because of their excellent technical properties such as high mechanical strength, high hardness, and good chemical corrosion resistance, as well as the advantages of wide source of raw materials, relatively cheap prices, and relatively mature processing and manufacturing technology. At present, the defects of alumina sealing rings produced in China are difficult to meet the needs of many special industries. For example, medical machinery, chemical industry and other industries are in urgent need of sealing rings that are not only corrosion-resistant, but also have high hardness and high density. Using commercially available ordinary alumina ceramic granulation powder, through the follow-up unconventional processing technology, although products th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/622
Inventor 孟德安简本成段光福
Owner ZHENGZHOU HICER HIGH TECH CERAMICS
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