Metal-based ceramic coating and preparation method of same

A ceramic coating, metal-based technology, applied in metal material coating process, coating, liquid chemical plating and other directions, can solve the problems of low coating thickness, thin coating, long time consumption, etc., to achieve adhesion Good, high purity, long shelf life effect

Active Publication Date: 2018-03-02
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

Among them, the preparation of coatings by vapor deposition has the disadvantages of slow speed and thin coatings; the application of self-propagating high-temperature synthesis technology is limited by the selection of raw material systems, and it is difficult to prepare dense coatings with a large thickness (several millimeters); Spraying and laser cladding require expensive equipment, and it is very difficult to prepare thicker coating materials. The brush coating method is to use a brush to coat the slurry on the surface of the substrate, which is not only time-consuming, but also the surface quality of the coating is average. It is not suitable for mass production (Qu Yanping, Ma Zhuang, Surface Technology, 39(6), 2010.12); while the sol-gel coating method has relatively low production cost, high coating efficiency, coating uniformity, and chemical

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  • Metal-based ceramic coating and preparation method of same

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Effect test

Embodiment 1

[0031] Step 1, steel substrate surface pretreatment: First, the surface of the steel substrate workpiece was ultrasonically cleaned with acetone for 30 minutes, then ultrasonically degreased with sodium hydroxide solution (mass fraction 2-8%) for 10 minutes, and finally polished with 120-mesh sandpaper ( provide a cleaner, rougher, more reactive surface for subsequent coatings);

[0032] Step 2, preparation of high-purity aluminum dihydrogen phosphate binder: Pour a phosphoric acid solution with a mass fraction of 65% into a three-necked flask, then add aluminum hydroxide powder (purity is 99.99%), mix and stir evenly at 120°C Carry out the oil bath for 1h to obtain the liquid aluminum dihydrogen phosphate finished product, and the molar ratio of phosphoric acid to aluminum hydroxide is 2.14:1;

[0033] Step 3, preparation of alumina insulating coating: 30g of aluminum dihydrogen phosphate binder, 60g of water, and 90g of nano-alumina are mixed uniformly and ball-milled for 5 ...

Embodiment 2

[0035] Step 1, steel substrate surface pretreatment: First, the surface of the steel substrate workpiece was ultrasonically cleaned with acetone for 30 minutes, then ultrasonically degreased with sodium hydroxide solution (mass fraction 2-8%) for 10 minutes, and finally polished with 120-mesh sandpaper ( provide a cleaner, rougher, more reactive surface for subsequent coatings);

[0036] Step 2, preparation of high-purity aluminum dihydrogen phosphate binder: Pour a phosphoric acid solution with a mass fraction of 65% into a three-necked flask, then add aluminum hydroxide powder (purity is 99.99%), mix and stir evenly, and heat at 130°C Carry out the oil bath for 1h to obtain the liquid aluminum dihydrogen phosphate finished product, and the molar ratio of phosphoric acid to aluminum hydroxide is 2.16:1;

[0037] Step 3, preparation of alumina insulating coating: 8g of aluminum dihydrogen phosphate binder, 16g of water, 23.8g of nano-alumina, 2.0g of nano-magnesium oxide were ...

Embodiment 3

[0039]Step 1, steel substrate surface pretreatment: First, the surface of the steel substrate workpiece was ultrasonically cleaned with acetone for 30 minutes, then ultrasonically degreased with sodium hydroxide solution (mass fraction 2-8%) for 10 minutes, and finally polished with 120-mesh sandpaper ( provide a cleaner, rougher, more reactive surface for subsequent coatings);

[0040] Step 2, preparation of high-purity aluminum dihydrogen phosphate binder: Pour a phosphoric acid solution with a mass fraction of 65% into a three-necked flask, then add aluminum hydroxide powder (purity is 99.99%), mix and stir evenly, and heat at 140°C Carry out oil bath 1h, promptly make liquid aluminum dihydrogen phosphate finished product, and the molar ratio of phosphoric acid and aluminum hydroxide is 3.12:1;

[0041] Step 3, preparation of alumina insulating coating: 9g of aluminum dihydrogen phosphate binder, 27g of water, 36g of nano-alumina, and 1.5g of nano-magnesia were uniformly mi...

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Abstract

The invention provides a metal-based ceramic coating and a preparation method of same. In the method, a dip-coating process is employed, wherein dense-phase ceramic coating having a certain thicknessis produced through the steps of: employing dip-coating process with self-made aluminum dihydrogen phosphate as a binder, a ceramic aggregate as a main base material and a nano-curing agent as an auxiliary base material, wherein the ratios of the components in the slurry are adjusted to reach the optimum ratio in the dip-coating process; and finally performing high-temperature curing treatment. The ceramic coating can reach 100 kV/mm in dielectric breakdown strength, can reach 500 DEG C in maximum available temperature, and can reach 0-grade (GB/T 31586.2) in adhesion force. The metal-based ceramic coating has controllable thickness, is high-temperature-resistant, acid-resistant, corrosion-resistant, wear-resistant and anti-radiation, has high compactness and insulation strength, is toxic-free and zero-pollution, is low in cost and simple in preparation method, and is suitable for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of preparation of functional coatings on the surface of metal materials, in particular to a metal-based ceramic coating and a preparation method thereof, in particular to a metal-based alumina ceramic coating and a preparation method thereof. Background technique [0002] Metal-based ceramic coating refers to the general term of heat-resistant inorganic protective layer or surface film coated on the metal surface, which can change the appearance, structure and properties of the metal substrate, thereby endowing the material with new properties. [0003] At present, as one of the coatings with excellent performance, alumina ceramic coating is a commonly used type of coating. Its preparation methods can be roughly divided into: sol-gel method, vapor deposition method, self-propagating high-temperature synthesis technology (SHS), Laser cladding technology, thermal spraying method (plasma spraying), brushing met...

Claims

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Application Information

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IPC IPC(8): C23C18/12C04B35/10C04B35/622C04B35/63
CPCC04B35/10C04B35/62222C04B35/6309C04B2235/3206C23C18/1216C23C18/1241C23C18/1254
Inventor 董衡王华栋李淑琴吕毅王涛肖振兴
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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