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Preparation method of high temperature sintered ceramic alumina abrasive

A ceramic alumina and high-temperature sintering technology, which is applied in chemical instruments and methods, and other chemical processes, can solve the problems of high-temperature-resistant secondary sintering, fine grain growth, and performance degradation of grinding wheels, etc., and achieve low production costs. , high toughness, good wear resistance

Active Publication Date: 2019-08-02
SUZHOU CHUANGYUAN INVESTMENT DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method of reducing the phase inversion temperature of alumina by adding additives and seeds can obtain ceramic microcrystalline abrasives, but this abrasive is not resistant to high temperature secondary sintering. When preparing grinding wheels, low temperature binders are required to avoid high temperature. Abnormal growth of fine grains when sintering the grinding wheel
At the same time, during the use of the grinding wheel, the local high temperature will also cause the grain to grow and deteriorate the performance of the grinding wheel
[0004] Therefore, there is a lack of a method for preparing high-temperature sintered ceramic alumina abrasives that can effectively inhibit the growth of crystal grains, can obtain properties such as high hardness, high toughness, and good wear resistance, and are resistant to high-temperature secondary sintering.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1) Boehmite, water, 0.6kg of aluminum chloride, 0.5kg of oleic acid and 3kg of boehmite containing impurities such as silicon oxide, sodium oxide, calcium oxide, iron oxide, etc. Fine-grained α-alumina is ground in a high-speed stirring mill for 12 hours to obtain a uniformly dispersed slurry;

[0030] Among them, the primary particle size of fine-grained α-alumina is 0.03 μm, and the median particle size D50 is 0.2 μm. The grinding medium is zirconia or alumina balls with a diameter of 3 mm. The mass ratio of abrasive, grinding medium and water is 1: 1:10.

[0031] 2) Mix the uniformly dispersed slurry and 90kg of water at a temperature of 85°C, stir evenly, and then place it in a water vapor environment of 105°C for 1.5 hours, and continue to pass carbon dioxide gas into it while keeping the heat. Stir, add acid to control the pH value to 3, and form aluminum sol;

[0032] 3) adding zirconium sol with zirconia content of 300g and titanium sol with titania content of...

Embodiment 2

[0037] 1) Boehmite, water, aluminum chloride of 0.5kg, oleic acid of 0.5kg and 3.5kg The fine-grained α-alumina was ground in a high-speed stirring mill for 15 hours to obtain a uniformly dispersed slurry;

[0038] Among them, the primary particle size of fine-grained α-alumina is 0.03 μm, and the median particle size D50 is 0.2 μm. The grinding medium is zirconia or alumina balls with a diameter of 3 mm. The mass ratio of abrasive, grinding medium and water is 1: 1:10.

[0039] 2) Mix the uniformly dispersed slurry and 100kg of water at a temperature of 90°C, stir evenly, and then place it in a water vapor environment of 110°C for 2 hours, and continue to pass carbon dioxide gas into it while keeping the temperature. Stir, add acid to control the pH value to 2, and form aluminum sol;

[0040] 3) adding zirconium sol with zirconia content of 350g and titanium sol with titania content of 150g to the aluminum sol liquid;

[0041] 4) Dry the sol prepared in step 3) in a nitrog...

Embodiment 3

[0045] 1) Boehmite, water, 0.4kg aluminum chloride, 0.4kg oleic acid and 4kg Fine-grained α-alumina was ground in a high-speed stirring mill for 20 hours to obtain a uniformly dispersed slurry;

[0046]Among them, the primary particle size of fine-grained α-alumina is 0.03 μm, and the median particle size D50 is 0.2 μm. The grinding medium is zirconia or alumina balls with a diameter of 3 mm. The mass ratio of abrasive, grinding medium and water is 1: 1:10.

[0047] 2) Mix the uniformly dispersed slurry and 110kg of water at a temperature of 85°C, stir evenly, and then place it in a water vapor environment at 100°C for 2 hours, and continue to pass carbon dioxide gas into it while keeping the temperature. Stir, add acid to control the pH value to 3.5, and form aluminum sol;

[0048] 3) adding zirconium sol with zirconia content of 250g and titanium sol with titania content of 110g to the aluminum sol liquid;

[0049] 4) Dry the sol prepared in step 3) in a nitrogen atmosphe...

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Abstract

The invention discloses a method for preparing a high-temperature sintering ceramic aluminum oxide grinding material. The method comprises the following steps that 1, boehmite, water, aluminum chloride, oleic acid and fine grain alpha-aluminum oxide are ground, and evenly-dispersed slurry is obtained; 2, the evenly-dispersed slurry and water are mixed and stirred to be uniform, and after carbon dioxide gas is introduced for heat preservation, acid is added to form alumina sol; 3, an additive is added into the alumina sol; 4, gel is formed after the sol prepared in the step 3 is dried, drying continues to be carried out, and xerogel is obtained; 5, the xerogel is subjected to heat preservation at the temperature of 1,400 DEG C to 1,550 DEG C, cooling and crushing are carried out, and then the high-temperature sintering ceramic aluminum oxide grinding material is obtained. The prepared high-temperature sintering ceramic aluminum oxide grinding material has the advantages of resisting high-temperature secondary sintering and being high in hardness, high in abrasion resistance and good in toughness, and is simple in preparation process and low in production cost, technological parameters are easy to control, and large-scale industrial production is easy.

Description

technical field [0001] The invention relates to the technical field of inorganic non-metallic materials, in particular to a method for preparing high-temperature sintered ceramic alumina abrasives. Background technique [0002] Alumina ceramic grinding media are widely used in ball milling and processing of white cement, minerals and ceramics, electronic materials, magnetic materials, and raw materials in coatings, paints, cosmetics, food, pharmaceuticals and other industries. They are high-quality grinding media. At the same time, alumina ceramic is also an important abrasive and abrasive material. Compared with ordinary fused abrasives such as white corundum, alumina ceramic abrasive has strong cutting ability and high grinding efficiency, and can carry out large cutting depth and large feed. and forming grinding; good self-sharpening, less grinding heat, low grinding temperature, no burns to the workpiece; high toughness, which can continuously expose new cutting surfaces...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/119C04B35/624C09K3/14
CPCC04B35/119C04B35/624C04B2235/3218C04B2235/3232C04B2235/656C04B2235/785C04B2235/96C09K3/1409
Inventor 王克力蒋丹宇司文元张涛徐兵夏金峰徐海芳
Owner SUZHOU CHUANGYUAN INVESTMENT DEV
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