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High-temperature infrared radiation coating and preparation method thereof

An infrared radiation and coating technology, applied in the field of infrared coatings, can solve the problems of large thermal stress, excessive thermal expansion performance difference, coating peeling off, etc., to enhance thermal shock resistance, reduce thermal expansion coefficient, and good high temperature stability. Effect

Inactive Publication Date: 2019-12-27
张崇关
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the infrared radiation coatings in our country are mainly used on the surface of refractory material substrates, and the phenomenon of coating shedding often occurs. In addition, the application of infrared radiation coatings on the surface of metal substrates is still relatively difficult, and there are often serious shedding phenomena, which seriously limits the coating quality. The effect is exerted, and it is relatively common for the coating to fall off from the surface of the substrate during use.
The reason is that on the one hand, the adhesion between the coating and the substrate is not strong enough, and on the other hand, the thermal expansion performance difference between the coating and the substrate is too large, and the thermal shock resistance is poor. The thermal stress on the contact surface is relatively large, causing the coating to fall off

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) In parts by weight of components, 40 parts of Fe 2 o 3 , 10 parts of MnO 2 , 5 parts of CuO, 5 parts of Co 2 o 3 , 15 Cr 2 o 3 , 50 parts Al 2 o 3 , 20 parts of SiO 2 100 parts of water are mixed and added into a ball mill, wet ball milled for 1 hour, passed through a 325 mesh sieve, and dried;

[0024] (2) After the above-mentioned dried product was press-molded at 0.01 MPa, it was fired at 1050° C. for 2 hours in a reducing atmosphere, crushed, and passed through a 250-mesh sieve to obtain a coating.

[0025] Coating 2mm on the surface of high alumina bricks to prepare coating samples for thermal shock resistance experiments, put the coating samples in a furnace with a temperature of 1100°C for heating, and keep them soaked for 30 minutes, then take out the coating samples for water testing Quenching, after 35 times of water quenching, the coating will not fall off or crack. The prepared coating has an emissivity of 0.92 in the whole infrared band range....

Embodiment 2

[0032] (1) In parts by weight of components, 22 parts of Fe 2 O, 47 parts of MnO 2 , 20 parts of CuO, 15 parts of Co 2 o 3 , 67 Cr 2 o 3 , 19 Al 2 o3 , 81 SiO 2 Mix and add in the ball mill, dry ball mill for 1.5 hours, pass through a 275 mesh sieve;

[0033] (2) After the material obtained in step (1) is compressed and formed at 20 MPa, it is fired at 1200° C. for 1 hour in a reducing atmosphere, crushed, and passed through a 250-mesh sieve to obtain a coating.

[0034] Coating 1.5mm on the surface of silica bricks to prepare coating samples for thermal shock resistance experiments, put the coating samples into a furnace with a temperature of 1000°C for heating, keep them soaked for 30 minutes, and then take out the coating samples for water testing. Quenching, after 38 times of water quenching, the coating will not fall off or crack. The prepared coating has an emissivity of 0.93 in the whole infrared band range. Coefficient of thermal expansion 2.9×10 -6 / °C. Whe...

Embodiment 3

[0045] (1) In parts by weight of components, 38 parts of Fe 2 O, 27 parts of MnO 2 , 31 parts of CuO, 29 parts of Co 2 o 3 , 33 Cr 2 o 3 , 27 Al 2 o 3 , 46 parts of SiO 2 100 parts of water were mixed and added into a ball mill, wet ball milled for 3 hours, passed through a 300-mesh sieve, and dried to obtain a dried product;

[0046] (2) After the material obtained in step (1) is pressed and molded at 50 MPa, it is fired at 1150° C. for 2 hours in an oxidizing atmosphere, crushed, and passed through a 275-mesh sieve to obtain a coating.

[0047] Coating 0.5mm on the surface of high-alumina bricks to prepare coating samples for thermal shock resistance test, put the coating samples in a furnace with a temperature of 1100°C to heat them, keep them soaked for 30 minutes, and then take out the coating samples for testing. Water quenching, after 40 times of water quenching, the paint will not fall off or crack. The resulting coating has an emissivity of 0.96 over the enti...

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Abstract

The invention discloses a high-temperature infrared radiation coating and a preparation method thereof. The composition comprises the following components, the high-temperature-resistant ceramic material is prepared from the following components: Fe2O3, MnO2, CuO, Co2O3, Cr2O3, Al2O3, SiO2, an adhesive and water. The content of each component is as follows in parts by weight: 15 to 92 parts of theFe2O3, 10 to 88 parts of the MnO2, 2 to 57 parts of the CuO, 0 to 42 parts of the Co2O3, 12 to 77 parts of the Cr2O3, 11 to 100 parts of the Al2O3, 7 to 100 parts of the SiO2, 0 to 60 parts of the adhesive and 0 to 150 parts of the water. The method comprises the following steps: (1) preparing a raw material formula (in parts by weight); 15 to 92 parts of the Fe2O3, 10 to 88 parts of the MnO2, 2to 57 parts of the CuO, 0 to 42 parts of the Co2O3, 12 to 77 parts of the Cr2O3, 11 to 53 parts of the Al2O3, 7 to 62 parts of the SiO2, 0 to 60 parts of the adhesive and 0 to 150 parts of water; (2)mixing the components, and performing ball milling, forming, sintering and crushing operations to obtain the infrared radiation coating. The high emissivity and high thermal shock resistance of the infrared coating and the high adhesion between the matrix and the coating are realized by adjusting the raw material formula and process parameters, the process is simple, and the operation is convenient.

Description

technical field [0001] The invention belongs to the technical field of infrared coatings, and in particular relates to a high-temperature infrared radiation coating and a preparation method thereof. Background technique [0002] Infrared radiation is an electromagnetic wave with a wavelength in the range of 0.76 μm to 1000 μm. The thermal effect is its basic feature. Infrared radiation heating has the advantages of uniform and rapid heating and efficient use of energy. The application of infrared radiation coatings on the inner wall of refractory materials of industrial kilns or the surface of heat accumulators and heat exchangers can effectively improve the infrared radiation ability and spectral characteristics of the surfaces of objects participating in radiation heat transfer in the furnace, and enhance the radiation heat transfer in the furnace Efficiency, improve the uniformity of temperature inside the kiln, promote the process of heating, heat storage, heat exchange,...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/622
CPCC04B35/10C04B35/622C04B2235/3241C04B2235/3267C04B2235/3272C04B2235/3275C04B2235/3281C04B2235/3418C04B2235/9607
Inventor 张崇关
Owner 张崇关
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