Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF4 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 composition of the film material. The advantages of precision and controllability are very suitable for the preparation of ceramic thin films, but the sol-gel method has high requirements for substrate surface treatment and the process takes a long time, and the coating steps in the sol-gel method may involve In the dipping and pulling process, since the slurry used in the preparation of alumina insulating coatings by the sol-gel method is mostly alumina sol, it takes a long time for sol, homogenization, gel, etc. when this process is adopted, and the prepared coating The thickness of the layer is relatively low, generally less than 500nm, and the coating is prone to cracks and other shortcomings when drying, resulting in poor adhesion between the coating and the metal-based material, and the protective effect on the metal-based material is not obvious

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Metal-based ceramic coating and preparation method of same

Examples

Experimental program
Comparison scheme
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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C23C18/12C04B35/10C04B35/622C04B35/63
CPCC23C18/1216C23C18/1241C23C18/1254C04B35/10C04B35/62222C04B35/6309C04B2235/3206
Inventor 董衡王华栋李淑琴吕毅王涛肖振兴
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products