A kind of potassium-based thermochromic film and preparation method thereof

A thermochromic, potassium-based technology, applied in metal material coating process, vacuum evaporation plating, coating, etc., can solve the problems of gap, low phase transition temperature, etc., achieve weight reduction, lower annealing temperature, and broaden the selection range effect

Active Publication Date: 2018-07-31
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Comparative literature 2 (WuC, Qiu J, He Y. Relevancy of phase separation between electrical and thermalproperties in La 0.8 Sr 0.2 MnO 3 thin films[J].Physical B:Condensed Matter,2011,406(10):1886-1889) prepared different thicknesses of La film on quartz glass substrate by magnetron sputtering 0.8 Sr 0.2 MnO 3 Thin films are annealed at 700°C. When the temperature changes from 173K to 300K, the emissivity ranges are 0.54-0.75, 0.52-0.65, and 0.52-0.71, which is much smaller than that of bulk materials, and The phase transition temperature is low, and there is still a certain gap with practical applications

Method used

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  • A kind of potassium-based thermochromic film and preparation method thereof
  • A kind of potassium-based thermochromic film and preparation method thereof
  • A kind of potassium-based thermochromic film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. Mix 44.16% of the total mass of lanthanum nitrate particles, 2.18% of calcium carbonate powder, 1.51% of potassium carbonate particles, and 52.14% of manganese nitrate solution in dilute nitric acid solution, add 151.2 grams of citric acid and 10ml of ethyl alcohol Diol, react in a water bath at 80°C to obtain a wet gel, and pre-calcine at a medium temperature of 550°C and a high temperature of 950°C to obtain a dry powder.

[0030] 2. Fully mix the powder with 10% by mass of polyvinyl alcohol binder, then ferment and sieve at normal temperature to obtain the powder raw material required for briquetting.

[0031] 3. Weigh about 80g of powder, use a press to press it into a cylindrical block, and dry it under vacuum at 100°C for 16 hours to obtain a target.

[0032] 4. Set the oxygen content to 20% during deposition, and the power of the RF power supply to 80W, deposit the components in the target onto a 500μm thick monocrystalline silicon substrate, and anneal at 600...

Embodiment 2

[0034] 1. Mix 44.06% of the total mass of lanthanum nitrate particles, 2.9% of calcium carbonate powder, 1% of potassium carbonate particles, and 51.91% of manganese nitrate solution in dilute nitric acid solution, add 151.2 grams of citric acid and 10ml of ethyl alcohol Diol, react in a water bath at 70°C to obtain a wet gel, and pre-calcine at a medium temperature of 470°C and a high temperature of 900°C to obtain a dry powder.

[0035] 2. Fully mix the powder with 8% polyvinyl alcohol binder by mass, ferment and sieve at normal temperature to obtain the powder raw material required for briquetting.

[0036] 3. Weigh about 80g of powder, use a press to press it into a cylindrical block, and dry it under vacuum at 90°C for 14 hours to obtain a target.

[0037] 4. Set the oxygen content to 15% during deposition, and the power of the RF power supply to 70W, deposit the components in the target onto a 300μm thick YSZ substrate, and anneal at 500°C in an oxygen-enriched environme...

Embodiment 3

[0039] 1. Mix 43.96% of the total mass of lanthanum nitrate particles, 3.62% of calcium carbonate powder, 0.5% of potassium carbonate particles, and 51.91% of manganese nitrate solution in dilute nitric acid solution, add 151.2 grams of citric acid and 10ml of ethyl alcohol Diol, react in a water bath at 60°C to obtain a wet gel, and pre-calcine at a medium temperature of 400°C and a high temperature of 800°C to obtain a dry powder.

[0040] 2. The powder is fully mixed with the polyvinyl alcohol binder of 7% by mass, and then fermented and sieved at normal temperature to obtain the powder raw material required for briquetting.

[0041] 3. Weigh about 80g of powder, use a press to press it into a cylindrical block, and dry it under vacuum at 80°C for 12 hours to obtain a target.

[0042] 4. Set the oxygen content to 10% during deposition, and the RF power to 60W, deposit the components in the target onto a 200μm thick single crystal silicon substrate, and anneal at 400°C in an...

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Abstract

The invention discloses a potassium-based thermochromic thin film and a preparation method thereof. The thin film is composed of a functional material layer and a substrate, wherein the functional material layer is made of a potassium-containing thermochromic material La0.7-0.8CaxKyMnO3, wherein 0<x+y<=0.3. The prepared thin film is of a nanometer-scale thickness and meanwhile has an excellent thermotropic radiation change characteristic, the weight of a thermal control system is greatly reduced, meanwhile, the annealing temperature of the thermochromic thin film is decreased, and the selection range of the substrate material is widened. The defect that common thermochromic ceramic targets are prone to cracking is overcome, and targets can be repeatedly used for preparing the thin film.

Description

technical field [0001] The invention relates to a potassium-based thermochromic film and a preparation method thereof, belonging to the technical field of aerospace thermal control. Background technique [0002] The emissivity of the rare earth manganese oxide material doped with divalent alkaline earth metal elements has thermally induced change characteristics. Under the condition of suitable doping concentration, the properties of manganese oxide material will undergo ferromagnetic metal state-paramagnetic insulating state transition with temperature change, presenting unique optical, electrical and magnetic properties, and the radiation properties of the material will also change accordingly. This property can control the radiation energy exchange between the system and the 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 prospects in the fields of national econ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C14/34C23C14/58
CPCC23C14/3414C23C14/5806
Inventor 范德松李强宣益民陆腾
Owner NANJING UNIV OF SCI & TECH
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