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Alpha-Al2O3 nanostructure aggregate material and preparation method thereof

A technology of nanostructures and aggregates, applied in the fields of nanostructure fabrication, nanotechnology, nanotechnology, etc.

Active Publication Date: 2012-01-11
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far, there is no method for large-scale preparation of alumina nanostructured aggregate materials with a particle size of less than 100 nm.

Method used

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  • Alpha-Al2O3 nanostructure aggregate material and preparation method thereof
  • Alpha-Al2O3 nanostructure aggregate material and preparation method thereof
  • Alpha-Al2O3 nanostructure aggregate material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Preparation of gel

[0038] ①Mix 67.0g of γ-AlOOH nanoparticles and 730.0mL of deionized water, and disperse evenly with a high-speed mixer to obtain a uniformly dispersed suspension of γ-AlOOH nanoparticles. ②Add 45.0mL of nitric acid solution with a concentration of 1.9mol / L to it To obtain the sol, ③add 40.0mL containing 1.5g La(NO 3 ) 3 ·6H 2 O, 0.94g Y (NO 3 ) 3 ·6H 2 O and 2.2gCo(NO 3 ) 2 ·6H 2 The aqueous solution of O was stirred at a speed of 3000r / min for 30 minutes to obtain a gel.

[0039] (2) Put the above-prepared gel into a 60°C oven for drying under normal pressure, pulverize and sieve.

[0040] (3) Put the xerogel particles prepared in step (2) with a particle size of 40-160 mesh into a muffle furnace, raise the temperature to 550° C. at a rate of 1.7° C. / min, and keep the temperature for 6 hours. The aggregate pre-fired at 550°C was heated to 1420°C at a rate of 70°C / min, and sintered for 2 hours.

[0041] The hardness of the obtained ag...

Embodiment 2

[0043] As described in Example 1, the difference is that step (1) ③ is: add 40.0mL containing 1.1g Nd 2 o 3 , 0.5gY (NO 3 ) 3 ·6H 2 O and 3.3g Co(NO 3 ) 2 ·6H 2 0.5mol / L nitric acid solution of O was stirred at a speed of 3000r / min for 32 minutes to obtain a gel.

[0044] The hardness of the obtained aggregate particles is 19.3GPa, and the density is 3.96g / cm 3 , the α-Al that makes up the aggregate 2 o 3 The thickness of the nanosheet is 10-20nm.

Embodiment 3

[0046] (1) Preparation of gel

[0047] Mix 67.0g of γ-AlOOH nanoparticles with 730.0mL of deionized water, and disperse evenly with a high-speed mixer to obtain a suspension of γ-AlOOH nanoparticles uniformly dispersed. Adding 45.0mL of nitric acid solution with a concentration of 1.9mol / L to obtain a sol, and then adding 40.0mL containing 1.1g Nd 2 o 3 , 2.0g Zr(NO 3 ) 4 ·5H 2 O and 3.6g Mg(NO 3 ) 2 ·6H 2 0.5mol / L nitric acid solution of O was stirred at a speed of 3000r / min for 30 minutes to obtain a gel.

[0048] (2) Put the above-prepared gel into a 90°C oven for drying under normal pressure, pulverize and sieve.

[0049] (3) Put the xerogel particles with a particle size of 40-80 meshes prepared in step (2) into a muffle furnace, heat up to 550° C. for calcination at a rate of 1.7° C. / min, and keep the temperature for 16 hours. The aggregate pre-fired at 550°C was heated to 1400°C at a rate of 70°C / min, and sintered for 2 hours.

[0050] The hardness of the obta...

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Abstract

The invention relates to an alpha-Al2O3 nanostructure aggregate material and a preparation method thereof. A basic structural unit forming an aggregate is an alpha-Al2O3 nano sheet the thickness of which is between 10 and 60 nanometers. The aggregate has the characteristics of dense structure, no pores among the alpha-Al2O3 nano sheets, density of 3.9 to 4.0g per cubic centimeter and hardness of 19 to 25GPa. The preparation method comprises the steps of preparing, drying and calcining a gamma-AlOOH gel and sintering the gamma-Al2O3 aggregate. The method is suitable for scale production, has easily controlled conditions and accurately controls reaction parameters and an additive. The obtained aggregate material can be used as a wear resistant material, a high-temperature material, an electron device, a high-frequency insulating material, an aerospace material, an information material and the like.

Description

technical field [0001] The present invention relates to a kind of α-Al 2 o 3 A nanostructure aggregate material and a preparation method thereof belong to the field of inorganic non-metallic materials. Background technique [0002] Alumina has the characteristics of high mechanical strength, high hardness, wear resistance, high temperature resistance, corrosion resistance, and good insulation. It can be used as high-pressure sodium lamp tubes, high-temperature materials, wear-resistant materials, integrated circuit substrates, high-frequency insulation materials, aerospace Materials, information materials, etc. (see New Materials Industry 2006, 12, 17). However, bulk alumina has weaknesses such as high brittleness and poor uniformity, which affect the reliability and safety of the workpiece. Therefore, how to improve the toughness of alumina is one of the important problems to be solved urgently. Compared with traditional alumina aggregate materials, nanostructured alumin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02C01F7/44B82B3/00
Inventor 陈代荣张立焦秀玲
Owner SHANDONG UNIV
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