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Method for synthesizing zirconium diboride/aluminium oxide composite powder

A technology of aluminum oxide and composite powder, which is applied in the synthesis field of zirconium diboride/aluminum oxide composite powder, can solve the problems of complex process steps, poor thermal shock stability and high production cost, and achieves the preparation of The effect of simple process, easy sintering and low synthesis cost

Inactive Publication Date: 2007-03-28
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Aluminum oxide (Al 2 o 3 ) ceramics are widely used, but the disadvantage is that the thermal shock stability is poor, and it is easy to crack and damage under the action of thermal shock
Its disadvantages are: the process steps are complex, the powder particles are micron-sized, not fine enough, and the production cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Raw materials: metal aluminum purity 99.2%, 40-50 microns, ZrO 2 99.5% purity, 5-10 microns, B 2 o 3 99.3% purity, 40-50 microns. According to Al, ZrO 2 and B 2 o 3 The molar ratio of 10: 3: 3 ingredients, premixed for 3 hours, got 15 grams of material into the ball mill tank on the high-energy ball mill, the ball-to-material ratio was 10: 1, and the rotating speed was 560 rpm for 3 hours.

[0018] The resulting ZrB 2 / Al 2 o 3 Composite powder technical indicators are:

[0019] Purity 96.5-98.5%, ZrB 2 The particle size is 850-1000 nm, Al 2 o 3 The particle size is 65-85 nanometers.

Embodiment 2

[0021] Raw materials: metal aluminum purity 99.1%, 40-50 microns, ZrO 2 99.3% purity, 3-5 microns, B 2 o 3 98.5% purity, 15-25 microns. According to Al, ZrO 2 and B 2 o 3 The molar ratio of 10: 3: 3 ingredients, premixed for 3 hours, got 18 grams of material into the ball mill tank on the high-energy ball mill, the ball-to-material ratio was 10: 1, and the rotating speed was 560 rpm for 5 hours.

[0022] The resulting ZrB 2 / Al 2 o 3 Composite powder technical indicators are:

[0023] 96-98% pure, ZrB 2 The particle size is 600-800 nm, Al 2 o 3 The particle size is 35-50 nanometers.

Embodiment 3

[0025] Raw materials: metal aluminum purity 99.1%, 40-50 microns, ZrO 2 99.3% purity, 5-8 microns, B 2 o 3 98.5% purity, 25-35 microns. According to Al, ZrO 2 and B 2 o 3 The molar ratio of 10: 3: 3 ingredients, premixed for 3 hours, got 12 grams of material into the ball mill tank on the high-energy ball mill, the ball-to-material ratio was 10: 1, and the rotating speed was 560 rpm for 2 hours.

[0026] The resulting ZrB 2 / Al 2 o 3 Composite powder technical indicators are:

[0027] 96-98% pure, ZrB 2 The particle size is 1500-3000 nm, Al 2 o 3 The particle size is 90-125 nanometers.

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Abstract

The invention is a zirconium diboride / dialuminum trioxide composite powder synthesizing method, belonging to the technical field of ceramics and fireproof materials, comprising the steps of: a) batching Al, ZrO2 and B2O3 powders as raw materials in the molar ratio of 10 to 3 to 3; b) premixing and taking and loading the mixture into the ball-milling tank of a high-energy ball mill, vacuumizing and charging argon gas, and ball- milling with bearing balls, where the ratio of balls to material is 10:(1-1.5); c) ball-milling at 500-600r / min for 2-5 h, and making it. And the invention has characters of simple process, low equipment investment, cheap raw materials, low synthesis cost, fine powder particles, etc. and it can be applied to ceramic and fireproof industries.

Description

technical field [0001] The invention relates to a synthesis method in the technical field of ceramics and refractory materials, in particular to a synthesis method of zirconium diboride / alumina composite powder. Background technique [0002] Zirconium diboride (ZrB 2 ) Ceramics have a very high melting point, high hardness, excellent electrical and thermal conductivity, excellent resistance to molten non-ferrous metals, cryolite erosion performance and thermal shock resistance. It has been used as ultra-high temperature structural materials, inert electrodes, high temperature electrical materials, hard tool materials, abrasives, cemented carbide additives and wear-resistant parts, etc. ZrB 2 For covalent bonds, the sintering performance is poor, and it is difficult to sinter densely by conventional sintering methods. For this reason, material workers have tried many methods to improve sintering performance, and adding other components to form a composite system is the mos...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/626C04B35/66
Inventor 陈海䶮王俊孙宝德
Owner SHANGHAI JIAO TONG UNIV
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