High-temperature high-emissivity heat dissipation coating and its preparation method and application

A high-emissivity, heat-dissipating coating technology, used in coatings, metal material coating processes, melt spraying, etc., can solve the problems of low emissivity, low service temperature, and unstable phase structure of thermal insulation coatings

Active Publication Date: 2021-12-17
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention is carried out in order to solve the above problems, and the purpose is to provide a high-temperature high-emissivity heat-dissipating coating and its preparation method and application, which can solve the problem of low emissivity, low service temperature and unstable phase structure of the existing heat-insulating coating at high temperature Not enough

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  • High-temperature high-emissivity heat dissipation coating and its preparation method and application
  • High-temperature high-emissivity heat dissipation coating and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Preparation:

[0026] Gd dried at 1000℃ 2 o 3 , ZrO 2 The raw materials are mixed according to the mass ratio of 60% and 40%, ball milled for 24 hours, dried, solid-phase reaction at 1600°C for 12 hours, mixed with ammonium citrate and gum arabic, ball milled for 72 hours, spray granulated, and vibrating sieved to obtain Ceramic powder with a particle size of about 45-60 μm and good fluidity.

[0027] The ceramic powder is sprayed on the treated superalloy substrate by atmospheric plasma spraying to obtain such as figure 1 (a) The high-temperature high-emissivity heat-dissipating GZ coating shown in (a) has a thickness of 280 μm. The spraying parameters include spraying current 600A, spraying voltage 75V, spraying distance 100mm, ceramic powder feeding rate 15%, plasma gas flow: argon 35L min -1 , Hydrogen 12L·min -1 .

[0028] Performance Characterization:

[0029] Such as figure 2 As mentioned above, at 800°C, the average normal spectral emissivity of the GZ...

Embodiment 2

[0031] Preparation:

[0032] Gd dried at 1050°C 2 o 3 , ZrO2 、TiO 2 The raw materials are mixed according to the mass ratio of 59%, 39.5% and 1.5%, ball milled for 24 hours, dried, solid-phase reaction at 1650°C for 12 hours, mixed with ammonium citrate and gum arabic, ball milled for 72 hours, spray granulated, vibrated Sieve to obtain a ceramic powder with a particle size of about 45-60 μm and good fluidity.

[0033] The ceramic powder is sprayed on the treated superalloy substrate by atmospheric plasma spraying to obtain such as figure 1 (b) The high-temperature high-emissivity heat dissipation GZT coating shown in (b) with a thickness of 250 μm. The spraying parameters include spraying current 650A, spraying voltage 70V, spraying distance 105mm, ceramic powder feeding rate 15%, plasma gas flow rate: argon 30L min -1 , Hydrogen 8L·min -1 .

[0034] Performance Characterization:

[0035] Such as figure 2 It is stated that, at 800°C, the average normal spectral emis...

Embodiment 3

[0037] Preparation:

[0038] Gd dried at 1100℃ 2 o 3 , ZrO 2 , MgO raw materials are mixed according to the mass ratio of 55%, 40% and 5%, ball milled for 24 hours, dried, solid-phase reaction at 1650°C for 12 hours, mixed with ammonium citrate and gum arabic, ball milled for 72 hours, spray granulated , vibrating sieving to obtain a ceramic powder with a particle size of about 45-60 μm and good fluidity.

[0039] The ceramic powder is sprayed on the treated superalloy substrate by atmospheric plasma spraying to obtain such as figure 1 (a) High-temperature high-emissivity heat-dissipating GZM coating shown in (a), with a thickness of 300 μm. Among them, the spraying parameters include spraying current 700A, spraying voltage 65V, spraying distance 110mm, ceramic powder feeding rate 15%, plasma gas flow rate: argon 40L min -1 , Hydrogen 5L·min -1 .

[0040] Performance Characterization:

[0041] Such as figure 2 As mentioned above, at 800°C, the average normal spectral...

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Abstract

The invention provides a high-temperature and high-emissivity heat dissipation coating and its preparation method and application. The preparation method of the heat dissipation coating is: spray ceramic powder on the surface of a substrate with a bonding layer by atmospheric plasma spraying technology to prepare a bonding layer formed on the surface of the substrate. High-temperature and high-emissivity heat dissipation coating containing Gd-Zr, Gd-Zr-Ti or Gd-Zr-Mg system multiple oxides on the ceramic powder, calculated by mass percentage, Gd 2 o 3 The content is 40-60%, ZrO 2 The content is 40-60%, TiO 2 The content is 0-5%, and the MgO content is 0-5%. The invention can solve the problems of low emissivity at high temperature, low service temperature and unstable phase structure of the existing thermal insulation coating, and the prepared thermal insulation coating not only has good thermal insulation performance, but also can dissipate heat well. by Mg 2+ or Ti 4+ Partial replacement of the parent material can also effectively improve the absorption in the near-infrared band.

Description

technical field [0001] The invention belongs to the technical field of preparation and application of special coatings, and in particular relates to a high-temperature, high-emissivity heat-dissipating coating and a preparation method and application thereof. Background technique [0002] As flight speeds increase, the aerodynamic surfaces of future generations of space vehicles, such as the nose and wing leading edges, will be subjected to extremely high temperatures in an oxidizing environment. Therefore, there is a requirement for better performance of the ceramic coating on the surface, not only requiring it to have good heat insulation performance, but also to be able to dissipate heat in time to reduce the temperature of the substrate, so high emissivity coatings have received extensive attention, especially for For spacecraft, a layer of high-emissivity coating is deposited on the surface of the spacecraft, and the heat is transferred to the surrounding environment th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/134C23C4/10
CPCC23C4/134C23C4/10
Inventor 董淑娟王德正曹学强蒋佳宁邓龙辉周鑫
Owner WUHAN UNIV OF TECH
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