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Preparation method of high-emissivity LaMgAl11O19 ceramic

A technology of lamgal11o19 and high emissivity, which is applied in the field of preparation of high emissivity LaMgAl11O19 ceramics, can solve the problems that ceramics are difficult to meet emissivity requirements, limit application and promotion, etc.

Active Publication Date: 2020-10-30
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the LaMgAl prepared by the hot pressing sintering process 11 o 19 It is difficult for ceramics to meet emissivity requirements, thus limiting its application and promotion

Method used

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  • Preparation method of high-emissivity LaMgAl11O19 ceramic
  • Preparation method of high-emissivity LaMgAl11O19 ceramic

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (1) La 2 o 3 Powder (average particle size 0.5μm, purity ≥ 99.9%), Al(OH) 3 Powder (average particle size 0.5μm, purity ≥ 99.9%) and Mg(OH) 2 The powder (average particle size is 0.5 μm, purity ≥ 98.0%) is compounded according to the stoichiometric ratio, and mixed by wet ball milling to obtain a uniformly mixed white mixed powder;

[0017] (2) Put the mixed powder into the mold, and then place the mold in a hot-press sintering furnace. In a vacuum environment, first heat it to 1100°C at a heating rate of 15°C / min, and then heat it at a heating rate of 10°C / min. Heating at a rate of 1500°C, at the same time starting from 1100°C and increasing the pressure to 40MPa at a rate of 1MPa / min, keeping the pressure at 1500°C and 40MPa for 2.5h, then cooling with the furnace to obtain a high emissivity LaMgAl 11 o 19 ceramics.

[0018] LaMgAl prepared in this embodiment 11 o 19 There are no micro-cracks on the surface of the ceramic, and it can be seen from its cross-sect...

Embodiment 2

[0021] (1) La 2 o 3 Powder (average particle size 0.5μm, purity ≥ 99.9%), Al(OH) 3 Powder (average particle size 0.5μm, purity ≥ 99.9%) and Mg(OH) 2 The powder (average particle size is 0.5 μm, purity ≥ 98.0%) is compounded according to the stoichiometric ratio, and mixed by wet ball milling to obtain a uniformly mixed white mixed powder;

[0022] (2) Put the mixed powder into the mold, and then place the mold in a hot-press sintering furnace. In a vacuum environment, first heat it to 950°C at a heating rate of 15°C / min, and then heat it at a heating rate of 10°C / min. Heating rate to 1400 ℃, and at the same time starting from 950 ℃ to increase the pressure to 45MPa at a rate of 1MPa / min, after holding the pressure at 1400 ℃ and 45MPa for 3 hours, cooling with the furnace to obtain high emissivity LaMgAl 11 o 19 ceramics.

[0023] LaMgAl prepared in this embodiment 11 o 19 There are no micro-cracks on the surface of the ceramic, and it can be seen from its cross-section ...

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Abstract

The invention relates to a preparation method of high-emissivity LaMgAl11O19 ceramic, and belongs to the technical field of preparation of lanthanum hexaaluminate ceramic materials. Firstly, La2O3 powder, Al (OH) 3 powder and Mg (OH) 2 powder are uniformly mixed, and hot-pressing sintering is carried out in a two-stage variable-speed heating mode and a pressurizing mode in the rear-stage heating process in a vacuum environment. The prepared LaMgAl11O19 ceramic is high in density, free of micro cracks on the surface, free of micro holes inside and pure in phase, and the spectral emissivity of the LaMgAl11O19 ceramic in the infrared band of 3-5 microns is greater than 0.9, so that the application requirements of the outer side thermal protection field of aerospace crafts and the energy-saving field of industrial kilns on the LaMgAl11O19 ceramic are met.

Description

technical field [0001] The invention relates to a high emissivity LaMgAl 11 o 19 The invention discloses a preparation method of ceramics, which belongs to the technical field of preparation of lanthanum hexaaluminate ceramic materials. Background technique [0002] LaMgAl 11 o 19 Ceramics have the characteristics of high infrared emissivity, high melting point, low thermal conductivity, high thermal expansion coefficient and excellent chemical stability. Utilizing its high infrared emissivity, it can protect the outer side of the aerospace vehicle and achieve the purpose of energy saving in industrial furnaces; and its extremely low thermal conductivity makes it an excellent thermal barrier coating material, and it is also an excellent thermal barrier coating material. an excellent fluorescent material. Visible, LaMgAl 11 o 19 Ceramics have excellent application prospects in the above fields. [0003] According to current application requirements, if LaMgAl 11 o 1...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/622C04B35/645
CPCC04B35/10C04B35/622C04B35/645C04B2235/3206C04B2235/6562C04B2235/6567C04B2235/661
Inventor 刘玲马壮柳彦博朱皓麟
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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