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Thermochromism coating with variable emissivity and preparation method thereof

A thermochromic and emissivity technology, applied in chemical instruments and methods, layered products, metal layered products, etc., to achieve the effects of overcoming low yield, easy large-scale production, and simple preparation methods

Active Publication Date: 2013-11-13
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a thermochromic variable emissivity coating and its preparation method, which overcomes the defects of manganese oxide ceramic flakes, avoids the influence of manganese oxide magnetism on coating preparation, and realizes thermochromic The adjustable emissivity function of the coating solves the problem of large-area application of manganese oxide thermal control materials and surface application of complex components, and improves the utilization rate of materials

Method used

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  • Thermochromism coating with variable emissivity and preparation method thereof
  • Thermochromism coating with variable emissivity and preparation method thereof
  • Thermochromism coating with variable emissivity and preparation method thereof

Examples

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Effect test

Embodiment 1

[0027] Step 1, the commercially available nickel-based alloy is cleaned by ultrasonic vibration with absolute ethanol, dried, and the surface is roughened with corundum particles of 80-120 microns, and then put into the plasma spraying sample stage, and after being preheated by the plasma flame, Spray a NiCrAl transition layer with a thickness of 90 microns.

[0028] Step 2, weigh 31.5397 grams of La respectively according to the stoichiometric ratio 2 o 3 , 5.5368 g CaCO 3 , 4.083 g SrCO 3 , and 24.0469 g MnO 2 Raw material powder, prepared La 0.7 Ca 0.2 Sr 0.1 MnO 3 The bulk material is ground into an ultrafine powder with an average particle size of 10 microns by using a high-energy ball mill.

[0029] Step 3: Add 3 grams of polyvinyl alcohol into a beaker filled with 97 grams of deionized water, place it in a constant temperature water bath at 80°C, stir thoroughly until the polyvinyl alcohol is completely dissolved, and obtain a plasticized polyvinyl alcohol with ...

Embodiment 2

[0033] Step 1. Clean the commercially available stainless steel substrate with anhydrous ethanol ultrasonic vibration and then dry it. Use corundum particles of 80-120 microns to roughen the surface, and then put it into the plasma spraying sample stage. A transition layer of NiCrAl with a thickness of 100 microns.

[0034] Step 2, weigh 31.2997 grams of La respectively according to the stoichiometric ratio 2 o 3 , 4.5331 g CaCO 3 , 5.4702 g SrCO 3 , and 23.8639 g MnO 2 Raw material powder, prepared La 0.7 Ca 0.165 Sr 0.135 MnO 3 The bulk material is ground into an ultrafine powder with an average particle size of 9.7 microns by using a high-energy ball mill.

[0035] Step 3: Add 8 grams of polyvinyl alcohol into a beaker filled with 92 grams of deionized water, place it in a constant temperature water bath at 80°C, stir thoroughly until the polyvinyl alcohol is completely dissolved, and obtain a plasticized polyvinyl alcohol with a concentration of 8% after cooling. ...

Embodiment 3

[0043] Step 1: Clean the commercially available zirconia substrate with anhydrous ethanol ultrasonic vibration, dry it, put it into the plasma spraying sample stand, and spray a layer of NiCrAlY transition layer with a thickness of 90 microns after preheating by the plasma flame.

[0044] Step 2, weigh 31.2997 grams of La respectively according to the stoichiometric ratio 2 o 3 , 4.5331 g CaCO 3 , 5.4702 g SrCO 3 , and 23.8639 g MnO 2 Raw material powder, prepared La 0.7 Ca 0.165 Sr 0.135 MnO 3 The bulk material is ground into an ultrafine powder with an average particle size of 9.7 microns by using a high-energy ball mill.

[0045] Step 3: Add 5 grams of polyvinyl alcohol into a beaker containing 95 grams of deionized water, place it in a constant temperature water bath at 80°C, stir well until the polyvinyl alcohol is completely dissolved, and obtain a plasticized polyvinyl alcohol with a concentration of 5% after cooling. agent for later use.

[0046] Step 4: Add 8...

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Abstract

The invention relates to a thermochromism coating with variable emissivity and a preparation method thereof. The coating comprises a transition layer and the thermochromism coating with variable emissivity; the transition layer is a NiCrAl or NiCrAlY coating with thickness of 50 to 100 mu m; the thermochromism coating with variable emissivity is a La0.7Ca0.3-xSrxMnO3 coating with thickness of 70 to 300 mu m wherein the x value in the La0.7Ca0.3-xSrxMnO3 is 0.1<=x<=0.3. In comparison with a prior art, the thermochromism coating with variable emissivity and the preparation method thereof have outstanding advantages that (1) the coating prepared in the invention overcomes a problem that fragility of a ceramics slice results in low rate of finished products; (2) a plasticizer is added to avoid influences of magnetism of a manganese oxide on the preparation of the coating; (3) the preparation method is simple, the thickness of the coating can be controlled easily, specifications of a test piece are not restrained, large-scale production is conducted easily, and the method is used widely and has great value in actual application; and (4) the prepared coating is applicable to thermal control and thermal management of temperature of systems and equipment and is particularly applicable to a spacecraft thermal control system and a surface or a wall of a building in an area with cold winter and hot summer.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and in particular relates to a thermochromic variable emissivity coating and a preparation method thereof. Background technique [0002] Rare earth manganese oxide materials doped with divalent alkaline earth metal elements have heat-induced changes in radiation characteristics. Under the condition of suitable doping concentration, the properties of manganese oxide materials will undergo ferromagnetic metal state-paramagnetic insulating state transition with temperature changes, and present unique optical, electrical and magnetic properties, and can be adjusted according to the temperature level of the system and equipment, Adjust its own radiation characteristics, control the radiation energy exchange between the system and equipment and the external environment, and realize the control and management of the temperature of the system and equipment, so that it has broad application p...

Claims

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Application Information

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IPC IPC(8): B32B9/04B32B15/00B32B33/00
Inventor 李强范德松宣益民
Owner NANJING UNIV OF SCI & TECH
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