Method for reducing firing shrinkage coefficient of alumina ceramic material and product made by the same

A technology of alumina ceramics and shrinkage rate, applied in the field of inorganic materials, can solve the problems of large processing volume, difficult processing, high cost, etc., and achieve the effect of good practical significance and obvious guiding significance

Inactive Publication Date: 2012-05-02
JINGDEZHEN CERAMIC INSTITUTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of post-processing, products with large deformation require a large amount of processing, and post-processing of high-hardness alumina ceramic materials is very difficult and costly
[0003] At present, most of the Chinese patents on alumina ceramic materials focus on improving the performance of alumina ceramic materials, lowering the firing temperature, and manufacturing methods for alumina ceramic products with specific shapes. There are no patents on related technologies for controlling the firing shrinkage of alumina ceramics. to report

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Composition according to the weight percentage in the table below, weigh industrial aluminum oxide powder, kaolin, talc and calcium carbonate, add 0.5wt% methyl cellulose, after wet ball milling, add metal aluminum powder according to the formula, mix, and grout molding , drying, bisque firing, finishing billet, and firing to obtain products.

[0014] Aluminum oxide powder

Metal Aluminum Powder

Kaolin

Talc

calcium carbonate

94.70

1.01

1.04

2.14

1.11

[0015] Some of the process parameters are: ball milling time: 46-48 hours, subject to the average particle size of the powder reaching 10 μm; mixing time: 2 hours; metal aluminum powder: high sphericity, active aluminum ≥ 98%, average particle size ≤10μm; bisque firing temperature: 1100°C; firing system: in the range of 900-1450°C, the heating rate is 50°C / hour, the highest sintering temperature is 1650°C, and the temperature is kept for 2 hours.

[0016] Th...

Embodiment 2

[0018] Composition by weight percentage in the following table, weigh industrial aluminum oxide powder, kaolin, talc and calcium carbonate, plus 0.5wt% methyl cellulose, after wet ball milling, add metal aluminum powder according to the formula, mix, spray granulate , dry pressing, drying, bisque firing, finishing billet, and firing to obtain products.

[0019] Aluminum oxide powder

Metal Aluminum Powder

Kaolin

Talc

calcium carbonate

92.17

2.71

2.05

2.0

1.07

[0020] Some of the process parameters are: ball milling time: 46-48 hours, subject to the average particle size of the powder reaching 10 μm; mixing time: 2 hours; metal aluminum powder: high sphericity, active aluminum ≥ 98%, average particle size ≤10μm; Molding pressure: 30Mpa; Bisque firing temperature: 1100°C; Firing system: In the range of 900-1450°C, the heating rate is 50°C / hour, the highest sintering temperature is 1650°C, and the temperature is kep...

Embodiment 3

[0023] Composition according to the weight percentage in the table below, weigh industrial aluminum oxide powder, magnesium oxide powder, dry ball milling, add 0.3wt% oleic acid, secondary ball milling, add metal aluminum powder according to the formula, mixed milling, drying, adding Paraffin wax and oleic acid are mixed, hot die-casting, wax removal, finishing blank, and firing to obtain products.

[0024] Aluminum oxide powder

Metal Aluminum Powder

magnesium oxide

96.83

2.15

1.02

[0025] Some of the process parameters are: dry milling time: 10 hours; secondary ball milling time: 30 hours; mixed milling time: 5 hours; metal aluminum powder: high sphericity, active aluminum ≥ 98%, average particle size ≤ 10 μm; drying Temperature: Bake at 120°C for 3 hours until the moisture content of the dry material is <1%; the amount of paraffin and oleic acid added: 58# paraffin plus 13wt%, oleic acid plus 0.2wt%; hot die casting: pressure 0.4...

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Abstract

The invention discloses a method for reducing the firing shrinkage coefficient of an alumina ceramic material and product made by the same. The firing shrinkage coefficient of the alumina ceramic material can be reduced by adopting metal aluminum powder instead of aluminum oxide powder so as to reduce the firing deformation rate of the product; the accurate control on size of alumina ceramic product can be implemented, and the post-processing cost of the product can be reduced by controlling the firing shrinkage coefficient to be tiny; the method for reducing the firing shrinkage coefficient of the alumina ceramic material is suitable for industrialized production.

Description

technical field [0001] The invention belongs to the field of inorganic materials, and in particular relates to a method for reducing the firing shrinkage of alumina ceramic materials and a product obtained therefrom. Background technique [0002] Alumina is an important structural and functional ceramic material, which is widely used as a component in modern industry and high technology. The firing shrinkage of alumina ceramic materials is relatively large. The shrinkage varies with the forming method and the particle size of the raw materials. Generally, the shrinkage is in the range of 10% to 25%. Large firing shrinkage directly leads to product deformation, which is difficult to achieve. Dimensional accuracy requirements for parts assembly often require post-processing such as grinding, cutting, and polishing of burned products. In the process of post-processing, products with large deformation require a large amount of processing, and post-processing of high-hardness al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/622
Inventor 石棋
Owner JINGDEZHEN CERAMIC INSTITUTE
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