TiO2-based electric heating coating and preparation method thereof

A coating and electric heating technology, which is applied in the direction of coating, electric heating device, ohmic resistance heating, etc., can solve the problems of short life, uneven heating, etc., to improve the short life, improve the uniformity of heating, and high content of oxygen-deficient phase Effect

Active Publication Date: 2019-08-13
GUANGDONG INST OF NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problems of uneven heating and short service life caused by traditional resistance wires or metal electrothermal coatings, and to obtain a more uniform and dense structure with a higher content of oxygen-deficient phases, which can be stable at higher temperatures Electrothermal coatings in service

Method used

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  • TiO2-based electric heating coating and preparation method thereof
  • TiO2-based electric heating coating and preparation method thereof
  • TiO2-based electric heating coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A kind of TiO 2 Base electrothermal coating, its preparation method such as figure 1 As shown, it specifically includes the following steps:

[0044] (1) Degrease and degrease the substrate, roughen it by sandblasting to a surface roughness Ra > 3 μm, and preheat it, and spray a NiCr bonding layer with a thickness of 100 μm and MgAl with a thickness of 200 μm in sequence 2 o 4 insulation layer;

[0045] (2) in MgAl 2 o 4 A ceramic heating layer is prepared on the surface of the insulating heat insulating layer. The material of the ceramic heating layer is TiO 2 -40wt%MgAl 2 o 4 . Among them, TiO 2 Particle size 15-45μm, MgAl 2 o 4 The particle size is 10-45μm. Vacuum the spraying chamber below 100Pa, then fill it with a protective atmosphere so that the pressure in the spraying chamber is 6kPa, the current of the plasma spray gun is 600A, the argon gas is 45L / min, the hydrogen gas is 12L / min, the spray distance is 270mm, and the gun moving speed is 400mm / ...

Embodiment 2

[0051] A kind of TiO 2 Base electrothermal coating, its preparation method comprises the steps:

[0052] (1) The substrate is degreased and degreased, roughened by sandblasting to a surface roughness Ra>3μm and preheated, followed by spraying a NiAl bonding layer with a thickness of 120μm and an Al layer with a thickness of 250μm 2 o 3 insulation layer;

[0053] (2) in Al 2 o 3 A ceramic heating layer is prepared on the surface of the insulating heat insulating layer. The material of the ceramic heating layer is TiO 2 -30wt%Al 2 o 3 . Among them, TiO 2 Particle size 15-45μm, Al 2 o 3The particle size is 5-22μm. Vacuum the spraying chamber below 100Pa, then fill it with a protective atmosphere to make the pressure in the spraying chamber 13kPa, the current of the plasma spray gun is 620A, the argon gas is 42L / min, the hydrogen gas is 10L / min, the spray distance is 240mm, and the gun moving speed is 300mm / s to obtain a ceramic heating layer with a thickness of 350 ...

Embodiment 3

[0058] A kind of TiO 2 Base electrothermal coating, its preparation method comprises the steps:

[0059] (1) Degrease and degrease the substrate, roughen it by sandblasting to a surface roughness Ra > 3 μm, and preheat it, and then spray a NiCrAlY bonding layer with a thickness of 90 μm and a YSZ insulation layer with a thickness of 180 μm;

[0060] (2) Prepare a ceramic heating layer on the surface of the YSZ insulation layer. The material of the ceramic heating layer is TiO 2 - 45 wt% YSZ. Among them, TiO 2 The particle size is 10-45μm, and the YSZ particle size is 22-45μm. Vacuum the spraying chamber below 100Pa, and then fill it with a protective atmosphere so that the pressure in the spraying chamber is 30kPa, the current of the plasma spray gun is 650A, the argon gas is 42L / min, the hydrogen gas is 9L / min, the spray distance is 180mm, and the gun moving speed is 500mm / s to obtain a ceramic heating layer with a thickness of 260 μm;

[0061] (3) Preparation of Al on...

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Abstract

The invention discloses a TiO2-based electric heating coating and a preparation method thereof. The electric heating coating which coats the surface of a base body comprises a bonding layer, an insulating and heat-insulating layer, a ceramic heating layer and an insulating and heat-conducting protective layer sequentially from bottom to top, and is connected with a power supply through electrodesinlaid at the two ends of the ceramic heating layer and binding posts thereon. The ceramic heating coating material is a TiO2-based ceramic material; a dopant comprises at least one of Al2O3, MgAl2O4,Cr2O3 and YSZ; and the resistance value and the heating effect can be controlled by regulating and controlling the thickness of the coating, the dopant materials and the proportioning. The electric heating coating is good in interlayer bonding, uniform and dense in tissue, high in heating speed and uniform in temperature distribution, and can meet long-time stable operation at the temperature of350 DEG C under the condition of low energy consumption; furthermore, the preparation method is high in efficiency and low in cost, and the preparation process is environmentally-friendly and pollution-free.

Description

technical field [0001] The invention relates to the technical field of heating, and in particular to a TiO 2 Base electrothermal coating and preparation method thereof. Background technique [0002] Electric heating devices are widely used in many fields of national production and life and national defense construction. The traditional electric heating method mainly adopts the electric heating wire arranged inside the substrate as the heating element, and the heat generated by the electric heating wire is transferred to the outer surface through the base material, so there are usually complex structures, uneven temperature distribution, low energy utilization rate, high cost and use issues such as short lifespan. In addition, in order to maintain a certain temperature on the surface of the substrate, the internal temperature will inevitably be too high and the temperature difference between the inside and outside of the material will be relatively large, which puts forward...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/073C23C4/08C23C4/11C23C4/18C23C4/10H05B3/02H05B3/03H05B3/14
CPCC23C4/134C23C4/073C23C4/08C23C4/11C23C4/18C23C4/10H05B3/141H05B3/03H05B3/02
Inventor 杨焜李喜洋周炎哲陈龙飞宋进兵邓春明邓畅光刘敏周克崧
Owner GUANGDONG INST OF NEW MATERIALS
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