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High-temperature anti-oxidation glaze layer material with infrared radiation heat dissipation effect and its application

A technology of heat dissipation and infrared radiation, applied in the field of high-temperature anti-oxidation glaze layer materials, can solve the problem of high cost, and achieve the effects of prolonging service life, uniform heating and preventing oxidation.

Active Publication Date: 2017-12-05
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Our laboratory previously announced a high-temperature infrared radiation rate anti-oxidation coating material using silicon oxide and zirconia as raw materials (Chinese patent CN101891398A), but the cost of raw materials used is high, and the coating needs a certain thickness to meet the anti-oxidation needs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method for preparing a high-temperature anti-oxidation glaze layer with infrared radiation and heat dissipation, comprising the following steps:

[0025] a. The composition and mass percentage of the high-temperature anti-oxidation glaze layer with infrared radiation and heat dissipation are:

[0026] Zirconium silicate powder 80%

[0027] Glass glaze powder 20%

[0028] Add absolute ethanol, powder: absolute ethanol = 1:8, and make a slurry.

[0029] Add dispersant to the total amount of slurry, 1%.

[0030] Wherein, dispersing agent is Polyethylene Glycol, and the chemical composition of glass glaze powder and mass percent are:

[0031] SiO 2 71.57%

[0032] Al 2 o 3 14.20%

[0033] Na 2 O 4.90%

[0034] BaO 3.65%

[0035] CaO 3.06%

[0036] K 2 O 1.34%

[0037] B 2 o 3 1.28%

[0038] b. According to the formula in step a, the mixture is ball milled for 12 hours, the particle size of the slurry is about 1 micron, and the slurry is evenly coated o...

Embodiment 2

[0042] This example is basically the same as Example 1, except that the mass percentages of zirconium silicate powder and glass glaze powder are 70% and 30%, and the prepared samples are heat-treated at a high temperature of 1500°C. The high-temperature anti-oxidation glaze layer with infrared radiation heat dissipation effect prepared in this example is tested and analyzed. The glaze layer is composed of two phases of zirconium silicate and glass glaze, and the infrared radiation rate at room temperature is 0.931 in the whole band of 1~22μm. A dense glaze layer is formed on the surface of the silicon carbide sample. The results of the 1500°C oxidation test show that the material with the protective glaze layer does not appear to be oxidized, while the material without the protective glaze layer is obviously oxidized.

[0043] The silicon carbide sample coated with the glaze layer was quickly placed in a high-temperature furnace at 1500°C, taken out after 10 minutes, and cooled...

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Abstract

The invention relates to a high-temperature anti-oxidation glaze layer material with infrared radiation heat dissipation effect and its application. The material uses zirconium silicate powder and glass glaze powder as raw materials, and the raw materials are mixed with ethanol and dispersant for slurry. The method of spraying or dipping is evenly coated on the surface of silicon carbide, zirconium carbide, boron carbide, zirconium diboride, molybdenum disilicide ceramics or silicon carbon rod and silicon molybdenum rod heating element, and the glaze layer is obtained by high temperature heat treatment. The glaze layer prepared by the invention can protect the coated ceramics and heating elements, and prevent the ceramics and heating elements from being oxidized at high temperature. The 1~22μm full-band infrared radiation rate of the glaze layer is greater than 0.93, which has a high infrared radiation heat dissipation effect. At the same time, the glaze layer has good thermal stability, which can be used for anti-oxidation and radiation heat dissipation of near-space aircraft and high-temperature heating elements.

Description

technical field [0001] The invention relates to a high-temperature anti-oxidation glaze layer material with infrared radiation heat dissipation function and its application. Background technique [0002] This high-temperature anti-oxidation glaze layer with infrared radiation and heat dissipation is mainly used for the protection of high-temperature heating elements, carbides, and boride ceramics, and can also be used in the fields of aerospace vehicles and high-temperature kilns. The glaze layer can insulate air at high temperatures, protect the coated ceramics, carbon / carbon composites or heating elements, and prevent these from being oxidized at high temperatures. At the same time, the glaze layer contains components with high infrared radiation performance, so it has a high infrared radiation heat dissipation effect. This glaze layer can be used to meet the anti-oxidation and infrared radiation heat dissipation requirements of some aerospace vehicles and kiln equipment....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C8/14
Inventor 甄强李政李榕
Owner SHANGHAI UNIV
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