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Method for improving aluminium oxide ceramic abrasive resistance by precipitation reaction

A technology of alumina ceramics and precipitation reaction, which is applied in the field of improving the wear resistance of alumina ceramics by precipitation reaction, and can solve the problem of high cost of nano-aluminum powder

Inactive Publication Date: 2010-07-07
山东鲲鹏新材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the nano-aluminum powder it needs is also a raw material with high cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Step 1: Weigh 1000kg of alpha alumina, 51kg of kaolin, 19kg of talcum powder, and 7kg of other auxiliary materials according to the existing process, and wet ball mill for 48 hours. The median particle size of the slurry is determined to be 1.49 microns, and the viscosity of Tu-4 is 13″86; pour the slurry from the ball mill into the stirring storage tank.

[0022] Second step: according to the technique of the present invention, the following raw materials are successively weighed and added to the stirring storage tank: magnesium chloride hexahydrate 35kg, calcium chloride hexahydrate 3kg, yttrium chloride 0.8kg, aluminum chloride hexahydrate 4kg, sodium silicate (Naphthine with a modulus of 2.4) 10kg.

[0023] Step 3: Add 60kg of polyvinyl alcohol aqueous solution (5wt%) to the slurry according to the existing technology, spray granulate after stirring evenly, stale, roll-form into a ball with a diameter of 6-16 mm, and dry it at 1460°C burnt.

[0024] The self-abras...

Embodiment 2

[0026] Step 1: Weigh 1000kg of alpha alumina, 51kg of kaolin, 19kg of talcum powder, and 7kg of other auxiliary materials according to the existing process, and wet ball mill for 48 hours. The median particle size of the slurry is determined to be 1.43 microns, and the viscosity of Tu-4 is 13″98; pour the slurry from the ball mill into the stirring storage tank.

[0027] Second step: according to the technique of the present invention, take by weighing following raw materials successively and add stirring storage tank: magnesium chloride hexahydrate 8kg, calcium chloride hexahydrate 2kg, yttrium chloride hexahydrate 1.5kg, zirconium oxychloride octahydrate 75kg, Ammonium fluoride 5kg, ammonium carbonate 27kg.

[0028] The third step: add 60kg of polyvinyl alcohol aqueous solution (5wt%) to the slurry according to the existing technology, spray granulation after stirring evenly, stale, roll forming into a ball with a diameter of 6-16 mm, and dry it at 1500 ° C burnt.

[0029]...

Embodiment 3

[0031]Step 1: Weigh 1000kg of alpha alumina, 51kg of kaolin, 19kg of talcum powder, and 7kg of other auxiliary materials according to the existing process, and wet ball mill for 48 hours. The median particle size of the slurry is determined to be 1.62 microns, and the viscosity of Tu-4 is 13″27; pour the slurry from the ball mill into the stirring storage tank.

[0032] Second step: press technology of the present invention, take by weighing following raw material successively and add stirring storage tank: magnesium nitrate hexahydrate 38kg, yttrium nitrate hexahydrate 1.8kg, sodium silicate (modulus is 2.4 sodium silicate) 9kg. .

[0033] The third step: add 60kg of polyvinyl alcohol aqueous solution (5wt%) to the slurry according to the existing technology, spray granulation after stirring evenly, stale, roll forming into a ball with a diameter of 6-16 mm, and dry it at 1450 ° C burnt.

[0034] The self-abrasion of the ceramic balls prepared above is 0.18%.

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PUM

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Abstract

The invention relates to a method for preparing aluminium oxide ceramics with good wear-resisting property, that is, low-cost soluble salt is added in slurry which takes water and aluminum oxide as main raw material, and then dehydration pelleting, molding and sintering are carried out; the specific method is that: one working procedure is added after ball-milling procedure and before pelleting procedure in the original preparation process; proper salt which can be dissolved in water and generates metal ions is added in the slurry with qualified fineness and viscosity by ball-milling; the added metal salt can be one, part or all of magnesium salt, calcium salt, yttrium salt, aluminum salt, strontium salt, barium salt, zircon salt, cerium alt and lanthanum salt, the total adding amount accounts for 0.1-30 percent of the alumina powder material, and the optimized adding amount is from 2 percent to 20 percent; the added precipitators can be one, partial or all of sodium hydroxide, sodium carbonate, sodium bicarbonate, sodium fluoride, sodium sulfide, sodium silicate, sodium aluminate, potassium hydroxide, potassium carbonate, potassium silicate, lithium hydroxide, lithium carbonate, calcium hydroxide, calcium oxide, barium hydroxide, ammonia, ammonium carbonate, ammonium hydrogencarbonate, ammonium fluoride, ammonium sulfide and carbamide, the total adding amount accounts for 0.05-20 percent of the alumina powder material quantity, and the optimized adding amount is 1-10 percent.

Description

technical field [0001] The invention relates to a preparation method for improving the toughness of porcelain parts by reacting in slurry to generate precipitates. More specifically, this patent relates to a method of adding low-cost soluble salts into a slurry mainly composed of water and alumina, followed by dehydration, granulation, molding, and firing to obtain alumina with excellent wear resistance. ceramic method. It belongs to the field of fine ceramics in inorganic non-metallic materials. Background technique [0002] Alumina ceramics are based on α-Al 2 o 3 Oxide ceramics, which are mainly composed of minerals, have the characteristics of large elastic modulus, extremely difficult to deform, good thermal stability, strong high temperature oxidation resistance, and low price, so they are favored by people. Alumina ceramics are currently one of the fine ceramic materials with the largest production volume and the widest application range in the world. They are wid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/622
Inventor 李军远刘卫东丁锐
Owner 山东鲲鹏新材料科技股份有限公司
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