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A kind of preparation method of perovskite type high emissivity spherical agglomerated powder

A high-emissivity, perovskite-type technology, applied in chemical instruments and methods, manganate/permanganate, cobalt compounds, etc., can solve the problem of irregular powder shape, limited application fields, uneven particle size, etc. problem, to achieve the effect of high sphericity, process safety, and uniform particle size distribution

Active Publication Date: 2021-10-22
北京理工大学重庆创新中心 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Powders prepared by traditional processes such as sintering and crushing have irregular shapes, uneven particle sizes, and extremely poor fluidity, so the application fields are limited

Method used

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  • A kind of preparation method of perovskite type high emissivity spherical agglomerated powder
  • A kind of preparation method of perovskite type high emissivity spherical agglomerated powder
  • A kind of preparation method of perovskite type high emissivity spherical agglomerated powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Select analytically pure La 2 o 3 、Cr 2 o 3 and MnO 2 The powder is used as a raw material, and it is kept in an oven at 100°C for 18 hours to remove crystal water, and immediately after the powder is cooled, the LaCr 0.8 mn 0.2 o 3 Weigh the required raw materials; put the weighed raw materials into the ball mill tank, add absolute ethanol, select zirconia as the grinding balls, the diameters of the grinding balls are 10mm, 5mm, 2mm, and the mass ratio is 2: 2:1, the mass ratio of balls to materials is 4:1, ball milled in a planetary ball mill at a speed of 300r / min for 5h, and the obtained slurry is subjected to rotary steaming, the rotating speed of which is 30r / min, the temperature of the water bath is 70°C, and then put Dry in an oven at 80°C for 12 hours to remove residual absolute ethanol to obtain a powder.

[0030] (2) the powder obtained in step (1) and deionized water, and the binding agent PVA are put into a ball mill jar, and the total mass of th...

Embodiment 2

[0048] (1) Select analytically pure La 2 o 3 、Cr 2 o 3 , MgO and Co 2 o 3 The powder is used as a raw material, and it is kept in an oven at 150°C for 12 hours to remove crystal water, and immediately after the powder is cooled according to LaCr 0.6 co 0.2 Mg 0.2 o 3 The proportioning ratio weighs the required raw materials; puts the weighed raw materials into the ball mill tank, adds absolute ethanol, selects zirconia as the grinding balls, the diameters of the grinding balls are 10mm, 5mm, 2mm, and the mass ratio is 2: 2:1, the mass ratio of ball to material is 4:1, ball milled in a planetary ball mill at a speed of 500r / min for 3h, and the obtained slurry was subjected to rotary steaming, the rotating speed of which was 60r / min, the temperature of the water bath was 80°C, and then put Dry in an oven at 120°C for 6 hours to remove residual absolute ethanol to obtain a powder.

[0049] (2) the powder obtained in step (1) and deionized water, and the binding agent PVA...

Embodiment 3

[0062] (1) Select analytically pure La 2 o 3 、Cr 2 o 3 and Co 2 o 3 The powder is used as a raw material, and it is kept in an oven at 120°C for 12 hours to remove crystal water, and immediately after the powder is cooled, according to LaCr 0.7 co 0.3 o 3 The proportioning ratio weighs the required raw materials; puts the weighed raw materials into the ball mill tank, adds absolute ethanol, selects zirconia as the grinding balls, the diameters of the grinding balls are 10mm, 5mm, 2mm, and the mass ratio is 2: 2:1, the mass ratio of the ball to the material is 4:1, ball milled in a planetary ball mill at a speed of 500r / min for 3h, and the obtained slurry was subjected to rotary steaming at a speed of 45r / min, the temperature of the water bath was 70°C, and then put Dry in an oven at 120°C for 6 hours to remove residual absolute ethanol to obtain a powder.

[0063] (2) the powder obtained in step (1) and deionized water, and the binding agent PVA are put into a ball mil...

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Abstract

The invention belongs to the field of high-emissivity materials, in particular to a method for preparing perovskite-type high-emissivity spherical agglomerated powder. The method comprises steps: 1) La 2 o 3 、Cr 2 o 3 And the oxide of M is LaCr 1‑x m x o 3 After metering, put it into a ball mill tank, add absolute ethanol, and ball mill to mix evenly to obtain a slurry, then the ball mill slurry is first rotated and then dried to obtain a mixed powder; 2) Put the powder, dispersant and binder into The slurry is obtained by ball milling in a ball mill tank; 3) sending the slurry into a prilling tower for spray granulation to obtain a spherical agglomerated powder; 4) heat-treating the spherical agglomerated powder at high temperature to obtain the product. The powder prepared by this method has almost no miscellaneous items, good high temperature chemical stability, and high emissivity of the powder. The emissivity of the whole band can reach more than 0.90. It is an ideal high emissivity material with high sphericity and fluidity. Good, the particle size distribution is uniform, which meets the needs of surface modification technologies such as thermal spraying.

Description

technical field [0001] The invention belongs to the field of high-emissivity materials, and relates to a high-emissivity material LaCr with a perovskite structure 1- x m x o 3 The invention discloses a method for preparing a spherical agglomerated powder, specifically a method for preparing a perovskite-type high-emissivity spherical agglomerated powder. Background technique [0002] During high-speed flight, a hypersonic vehicle will rub against the atmosphere violently, and the aerodynamic heat generated will cause the surface temperature of the vehicle to be too high, which will damage the structure of the vehicle and reduce the service life of the vehicle. Traditional thermal protection methods, such as heat absorption, are not conducive to the development of lightweight aircraft and have been phased out. High-emissivity materials can radiate a large amount of heat from the surface of the aircraft, which is an effective way to reduce the surface temperature of the me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G45/12C01G51/00C23C4/11
CPCC01G45/1264C01G51/40C01G51/56C01P2002/72C01P2004/03C01P2004/32C01P2004/50C01P2004/61C23C4/11
Inventor 刘玲马壮柳彦博张淑玉
Owner 北京理工大学重庆创新中心
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