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High-temperature corrosion-resistant coating and preparation method thereof, and high-temperature corrosion-resistant material

A corrosion-resistant, high-temperature technology, applied in the field of high-temperature corrosion-resistant materials and their preparation, to achieve the effects of high safety, short production cycle, and simple preparation process

Active Publication Date: 2018-04-13
优澎(嘉兴)新材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, thermal spraying, chemical vapor deposition, physical vapor deposition, laser cladding, powder metallurgy, and self-propagating high-temperature synthesis are mainly used to prepare ceramic coatings on metal surfaces. However, these methods have certain shortcomings. Applying coating often requires multiple coats to achieve complete coverage

Method used

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  • High-temperature corrosion-resistant coating and preparation method thereof, and high-temperature corrosion-resistant material
  • High-temperature corrosion-resistant coating and preparation method thereof, and high-temperature corrosion-resistant material
  • High-temperature corrosion-resistant coating and preparation method thereof, and high-temperature corrosion-resistant material

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preparation example Construction

[0036] Such as figure 1 As shown, the preparation method of the high-temperature corrosion-resistant coating according to the embodiment of the present invention includes the following steps:

[0037] 1) providing the sol for forming the high-temperature corrosion-resistant coating;

[0038] It should be noted that the sol can be a commercially available sol, or a sol obtained by the following method:

[0039] 1.1) Disperse the precursor in a solvent to form a precursor dispersion

[0040] The solvent may be water, ethanol, isopropanol, benzyl alcohol, dimethylformamide and mixtures thereof, wherein water, ethanol, isopropanol and mixtures thereof are preferred, especially water, ethanol and mixtures thereof.

[0041] Wherein, the precursor may be a silicon precursor, a titanium precursor, or a mixture of a titanium precursor and a zirconium precursor.

[0042] Wherein, the silicon precursor includes: tetraethylorthosilicate (TEOS), methylorthosilicate (TMOS), methylsilicat...

Embodiment 1

[0069] Take 1 part of ammonia-stabilized silica sol, add 0.5 part of ethanol solvent and mix evenly, then add 0.1 part of 1% oxalic acid to adjust the pH to 5-6.

[0070] After that, put the matrix after ultrasonic cleaning with water, ethanol, and acetone, then irradiate with ultraviolet light and dry it in the above sol, gel after about ten minutes, then put it in an oven at 70°C for 12 hours, and then take it out and wash it with distilled water for 3 times, and then placed in an oven at 80 ° C for 1 h to obtain SiO 2 Coated modified substrate.

[0071] Its corresponding electron micrograph is shown in figure 2 shown.

[0072] Its corrosion resistance (Table 1) is at 0.5M H 2 SO 4 solution until the surface is corroded by naked eyes, record the time until the surface corrodes. The high temperature corrosion resistance is judged according to the 6h anti-oxidation test in a muffle furnace at 800°C, and by comparing the weight gain.

[0073] In Table 1, for comparison, ...

Embodiment 2

[0077] Take 1L (3.21M) of fluosilicic acid, add a certain amount of silicic acid to saturation, then add 0.18L of boric acid (0.1M), mix well, put the treated substrate into the above deposition solution, and place it in an 80°C The deposition reaction was carried out in an oven for 8 hours, and then the obtained samples were washed several times with distilled water, and dried in an oven at 80° C. for 1 hour.

[0078] Thereafter, heat treatment was performed at 900 °C for 2 hours to obtain a silica-coated substrate sample.

[0079] Its electron microscope picture is as image 3 shown.

[0080] Its corrosion resistance (Table 2) is at 0.5M H 2 SO 4 solution until the surface is corroded by naked eyes, record the time until the surface corrodes. The high temperature corrosion resistance is judged according to the 6h anti-oxidation test in a muffle furnace at 800°C, and by comparing the weight gain.

[0081] In Table 2, for comparison, the related experimental data of the u...

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Abstract

The invention discloses a high-temperature corrosion-resistant coating and a preparation method thereof, and a high-temperature corrosion-resistant material. The preparation method comprises the following steps: 1) providing the high-temperature corrosion-resistant coating so as to form a sol; 2) allowing the sol to generate a gelation reaction; 3) placing a substrate in the treated sol obtained in the step 2) so as to form a gel on the surface of the substrate; and 4) taking out the substrate with the surface formed with the gel, and subjecting the gel to drying treatment so as to form the high-temperature corrosion-resistant coating, wherein the step of drying treatment is performed in a drying box at 50 to 100 DEG C for 0.5 h to 10 h. According to embodiments of the invention, the preparation method for the high-temperature corrosion-resistant coating can form a coating with excellent wear resistance, acid corrosion resistance and high-temperature corrosion resistance on the surfaceof the substrate, has the advantages of simple and convenient preparation process, short production period, low cost and high safety, can realize large-scale production and application, and is also applicable to formation of a coating on the surface of a special-shaped part.

Description

technical field [0001] The invention relates to the technical field of inorganic materials, more specifically, to high-temperature corrosion-resistant materials and a preparation method thereof. Background technique [0002] Because metal materials are inevitably in contact with oxygen, water vapor, acid mist, acids, alkalis, salts and other substances in the atmosphere, there is an inevitable corrosion phenomenon, which is more serious in extreme environments. Because the preparation of protective coatings on the surface of the substrate is the most widely used technology today. [0003] Most ceramic materials have the characteristics of high melting point, high hardness, high stiffness, high chemical stability, high insulation, small thermal expansion coefficient, small friction coefficient and no ductility. The ceramic coating has the advantages of heat resistance, wear resistance, corrosion resistance, self-cleaning and biological activity, and has a wide range of appli...

Claims

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Application Information

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IPC IPC(8): C04B35/622C04B35/48C04B35/49C04B35/46C04B35/14
CPCC04B35/14C04B35/46C04B35/48C04B35/49C04B35/62222C04B2235/3232C04B2235/3244
Inventor 向军辉章婷赛华征关运龙陈俊勇
Owner 优澎(嘉兴)新材料科技有限公司
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