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High-sintering-activity pure-phase nano MgAl2O4 powder as well as preparation method and application thereof

A technology of sintering activity and mgal2o4 is applied in the field of ceramic powder preparation, which can solve the problems of adverse effects of later application of powder and increase the impurity content of powder, and achieves the effect of simple and easy process, improved sintering activity and short diffusion distance.

Active Publication Date: 2022-05-27
DALIAN MARITIME UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although additives can reduce the MgAl 2 o 4 The synthesis temperature of the powder, but it will inevitably increase the impurity content in the powder, which will adversely affect the later application of the powder

Method used

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  • High-sintering-activity pure-phase nano MgAl2O4 powder as well as preparation method and application thereof
  • High-sintering-activity pure-phase nano MgAl2O4 powder as well as preparation method and application thereof
  • High-sintering-activity pure-phase nano MgAl2O4 powder as well as preparation method and application thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0041] A pure phase nano-MgAl with high sintering activity 2 O 4 The preparation method of powder comprises the following process steps:

[0042] (1) Weigh γ-Al in a molar ratio of 1:1 to 1.3:1 2 O 3 and MgO raw material powder, wherein the raw material γ-Al 2 O 3 and MgO are high-purity nano-powders, among which γ-Al 2 O 3 Purity ≥99.9%, average particle size ≤40nm, specific surface area ≥120m 2 / g; MgO consists of Mg(OH) 2 Obtained by calcining at 600℃ for 60min in air, the purity is ≥99.9%, the average primary particle size is ≤90nm, and the specific surface area is ≥15m 2 / g;

[0043] (2) Using absolute ethanol as a medium, the weighed γ-Al 2 O 3 Mixed with MgO powder in a planetary ball mill at 170rpm for 20-30h;

[0044] (3) drying the slurry after ball milling and passing through a 60-80 mesh sieve;

[0045] (4) γ-Al obtained by drying and granulation 2 O 3 The powder mixed with MgO is put into a crucible and placed in a box furnace. 2 O 4 For powder, t...

Embodiment 1

[0048] With a purity of 99.99%, an average particle size of 14nm, and a specific surface area of ​​128m 2 / g of γ-Al 2 O 3 Powder and calcined Mg(OH) in air at 600℃ for 60min 2 The obtained pure phase MgO powder (average particle size 80nm, specific surface area 21m 2 / g) as raw material (γ-Al 2 O 3see the phase composition of MgO figure 1 , see figure 2 ), press γ-Al 2 O 3 and MgO molar ratio 1:1 (γ-Al 2 O 3 71.83wt.%, MgO 28.17wt.%) Weigh 20g of raw material powder, add 100ml of absolute ethanol to prepare γ-Al 2 O 3 The mixed slurry with MgO was milled on a planetary ball mill at 170 rpm for 24 hours, and the obtained mixed slurry was dried, passed through a 60-mesh sieve, γ-Al 2 O 3 The morphology of +MgO mixed powder is as follows image 3 shown.

[0049] The γ-Al 2 O 3 +MgO mixed powder into Al 2 O 3 Put the crucible into a box furnace, heat it up to 1250 °C for 60 min at 10 °C / min in an air environment, turn off the power and cool with the furnace to...

Embodiment 2

[0053] The difference between Example 2 and Example 1 is that γ-Al 2 O 3 The mass ratio of MgO and MgO is 1.1:1, the obtained pure phase MgAl 2 O 4 The XRD pattern of the powder is shown in Figure 4 , see Figure 12 , the specific surface area of ​​the obtained powder was measured to be 24.99m 2 / g, the average primary particle size is 67 nm.

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Abstract

The invention relates to high-sintering-activity pure-phase nano MgAl2O4 powder as well as a preparation method and application thereof, and belongs to the technical field of ceramic powder preparation. The invention relates to a preparation method of pure-phase nano MgAl2O4 powder with high sintering activity. The preparation method comprises the following steps: drying and sieving gamma-Al2O3 and MgO powder which are subjected to ball milling and mixing; the obtained gamma-Al2O3 and MgO mixed powder is subjected to heat preservation for 60 min to 180 min at the temperature of 1200 DEG C to 1400 DEG C in the air atmosphere, and pure-phase MgAl2O4 powder is obtained; the obtained pure-phase MgAl2O4 powder is subjected to ball milling, the pure-phase nano MgAl2O4 powder with high sintering activity is obtained, and the molar ratio of gamma-Al2O3 to MgO powder is 1: 1-1.3: 1. According to the method, the MgAl2O4 powder is synthesized by taking gamma-Al2O3 and MgO as raw materials through a high-temperature solid-phase reaction, and the method is simple and easy to implement and convenient to

Description

technical field [0001] The present invention relates to a kind of high sintering activity pure phase nanometer MgAl 2 O 4 The powder, its preparation method and application belong to the technical field of ceramic powder preparation. Background technique [0002] MgAl 2 O 4 (Magnesium Aluminum Spinel, MAS) ceramics not only have high wave transmittance in the wide band range of 0.2-5.5 μm, but also have excellent physical and chemical properties, such as low density (3.58 g / cm 3 ), high hardness (16GPa), high thermal shock resistance, acid and alkali resistance, etc., is a structural and functional integrated ceramic material with excellent comprehensive properties, which can be widely used in many fields such as national defense and security, energy and information. [0003] The preparation of MAS ceramics mainly includes two ways: one is Al 2 O 3 Direct high-temperature solid-phase reaction with MgO two powders, the second is to prepare MAS powder first and then dens...

Claims

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Application Information

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IPC IPC(8): C04B35/443C04B35/626C04B35/622
CPCC04B35/443C04B35/6261C04B35/62645C04B35/622C04B2235/77C04B2235/9646C04B2235/6583C04B2235/656C04B2235/6567
Inventor 单英春蒋璇徐久军孙先念韩晓光
Owner DALIAN MARITIME UNIVERSITY
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