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Method for preparing aluminum oxide ceramics with excellent wear-resisting property

A technology of alumina ceramics and ball milling, which is applied in the field of alumina ceramics, can solve problems such as failure to find satisfaction, and achieve the effects of excellent wear resistance, simple process, and low sintering temperature

Inactive Publication Date: 2013-06-12
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Improving the wear resistance of alumina ceramics, especially high alumina ceramics, has not yet found a satisfactory solution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) The mass percentage content of each component of the raw material is: α-Al 2 o 3 Powder 93.5%, yttrium hydroxide 1.5%, kaolin 1.66%, calcium oxide 1.67% and magnesium oxide 1.67%.

[0024] (2) Put the raw materials prepared in step (1) into a ball milling device and mill them for 42 hours.

[0025] (3) Dry the slurry obtained in step (2) at 110°C for 8 hours.

[0026] (4) The powder obtained in step (3) is molded by isostatic pressing (100MP), and kept under pressure for 10 minutes to make a spherical green body.

[0027] (5) Sinter the spherical green body obtained in step (4) at 1450°C in a high-temperature resistance furnace. The sintering is carried out in an air atmosphere, kept for 60 minutes, and cooled to room temperature to obtain the required wear-resistant alumina ceramic material. Test the wear rate of the sample is 0.000552%h -1 .

Embodiment 2

[0029] (1) The mass percentage content of each component of the raw material is: α-Al 2 o 3 Powder 96%, Yttrium Hydroxide 1.0%, Kaolin 1.0%, Calcium Carbonate 1.0% and Basic Magnesium Carbonate 1.0%.

[0030] (2) Put the raw materials prepared in step (1) into a ball milling device and mill them for 42 hours.

[0031] (3) Dry the slurry obtained in step (2) at 110°C for 8 hours.

[0032] (4) The powder obtained in step (3) is molded by isostatic pressing (100MP), and kept under pressure for 10 minutes to make a spherical green body.

[0033] (5) Sinter the spherical green body obtained in step (4) at 1480°C in a high-temperature resistance furnace. The sintering is carried out in an air atmosphere, kept for 100 minutes, and cooled to room temperature to obtain the required wear-resistant alumina ceramic material. Test the wear rate of the sample is 0.000447%h -1 .

Embodiment 3

[0035] (1) The mass percentage content of each component of the raw material is: α-Al 2 o 3 Powder 95%, yttrium oxide 1.0%, kaolin 1.5%, calcium carbonate 1.5% and dolomite 1.0%,.

[0036] (2) Put the raw materials prepared in step (1) into a ball milling device and mill them for 42 hours.

[0037] (3) Dry the slurry obtained in step (2) at 110°C for 8 hours.

[0038] (4) The powder obtained in step (3) is molded by isostatic pressing (100MP), and kept under pressure for 10 minutes to make a spherical green body.

[0039] (5) Sinter the spherical green body obtained in step (4) at 1430°C in a high-temperature resistance furnace. The sintering is carried out in an air atmosphere, kept for 120 minutes, and cooled to room temperature to obtain the required wear-resistant alumina ceramic material. Test the wear rate of the sample is 0.000489%h -1 .

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Abstract

The invention discloses a method for preparing aluminum oxide ceramics with excellent wear-resisting property. The method comprises the steps of: (1) preparing for the following components of raw materials in percent by weight: 70-99 percent of Al2O3, 0.01-10 percent of rare earth yttrium compound and 0.19-20 percent of calcium compound or mineral, magnesium compound or mineral and silicon compound or mineral; (2) ball-milling the raw materials prepared in the step (1) for 4-96 h; (3) after drying the raw materials obtained in the step (2), preparing a blank body by adopting isostatic compaction, roller forming or axial extrusion forming; and (4) sintering the blank body at a temperature of 1150-1700 DEG C, preserving the temperature for 15-360 min and cooling to room temperature to prepare the finished product, wherein the sintering is pressureless sintering, and the sintering atmosphere is air atmosphere or reducing atmosphere. According to the method, through adding the rare earth yttrium compound and by adopting common industrial equipment, the process is simple; and compared with rare earth-free aluminum oxide ceramics, the aluminum oxide ceramics is low in sintering temperature and excellent in wear-resisting property.

Description

technical field [0001] The invention relates to a method for greatly improving the wear resistance of alumina ceramics, reducing the firing temperature of the ceramics, and preparing alumina ceramics with excellent wear resistance. Background technique [0002] Since the British first used alumina ceramics as tool materials in 1912, and the German Siemens-Hangst Company made alumina spark plug insulators in 1931, and obtained a patent for sintered corundum, the development of alumina ceramics has made great progress and has become a kind of It is the special ceramic material with the largest amount and the widest range of applications. Only in the aspect of engineering ceramic wear-resistant materials, it involves cutting tools, various wear-resistant sandblasting nozzles, wire drawing dies, wire drawing cones, wire guides, bearings, bushings, bearing balls, ball valves, grinding media and many other products. Used in metallurgy, light industry, chemical industry, electrome...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/63
Inventor 熊媛吴伯麟
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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