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Preparation method of prestressed anti-low temperature gradient film layer composite coating

A prestressed, low temperature resistant technology, applied in the field of preparation of prestressed low temperature resistant gradient film layer composite coating, can solve the problem that it is difficult to effectively stabilize the interface bonding strength of the film layer composite coating

Active Publication Date: 2020-12-04
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims at the present situation in the field of research and development of common means that it is difficult to effectively stabilize the interface bonding strength of the film layer composite coating and improve its ultra-low temperature strength performance, and provides a preparation method of a prestressed low temperature gradient resistant film layer composite coating

Method used

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Examples

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Effect test

preparation example Construction

[0019]The method for preparing a composite coating of a prestressed anti-low temperature gradient film layer of the present invention includes the following steps:

[0020](1) Put the four-component nickel-iron atomized pre-alloyed powders of 45Ni55Fe, 55Ni45Fe, 65Ni35Fe, 85Ni15Fe with an average particle size of 120-190 microns in the electric spark heat flow impact spraying equipment according to the mass percentage of nickel from low to high. Four layers of nickel-iron coating are sprayed on the 45# steel substrate in sequence. The electric spark is used to generate instant high energy and transfer to the sprayed powder. The heat flow is preheated nitrogen, the temperature is 470~560℃, and the nitrogen flow required for the four layers of nickel-iron layer are respectively 350~400ml / sec, 360~410ml / sec, 400~440ml / sec, 410~450ml / sec, nitrogen flow rate is 220~280m / sec, 210~270m / sec, 180~240m / sec, 180~230m / s, get prestressed gradient nickel-iron coating;

[0021](2) Using alumina cutting ...

Embodiment 1

[0023](1) Put the four-component nickel-iron atomized pre-alloyed powders of 45Ni55Fe, 55Ni45Fe, 65Ni35Fe, 85Ni15Fe with an average particle size of 120 microns in the electric spark heat flow impingement spraying equipment according to the mass percentage of nickel from low to high. #Steel substrate is sprayed with four layers of nickel-iron coating in sequence, electric spark is used to generate instant high energy and transfer to the sprayed powder, the heat flow is preheated nitrogen, the temperature is 470℃, the nitrogen flow required for the four layers of nickel-iron layer is 350ml / sec. , 360ml / sec, 400ml / sec, 410ml / sec, the nitrogen flow rate is 220 m / sec, 210 m / sec, 180 m / sec, 180 m / sec, respectively, to obtain the prestressed gradient nickel-iron coating;

[0024](2) Using aluminum oxide cutting element iron-based powder to perform surface magnetic polishing on the prestressed gradient nickel-iron coating to obtain a surface roughness of 0.1μm coating, and finally use a dual ...

Embodiment 2

[0026](1) Put the four-component nickel-iron atomized pre-alloyed powders of 45Ni55Fe, 55Ni45Fe, 65Ni35Fe, 85Ni15Fe with an average particle size of 130 microns in the electric spark heat flow impact spraying equipment according to the mass percentage of nickel from low to high. #Steel substrate is sprayed with four layers of nickel-iron coatings in sequence. The electric spark is used to generate instant high energy and transfer to the sprayed powder. The heat flow is preheated nitrogen, the temperature is 480℃, and the nitrogen flow required for the four layers of nickel-iron is 360ml / sec. , 370ml / sec, 410ml / sec, 420ml / sec, the nitrogen flow rate is 230m / sec, 220m / sec, 190m / sec, 180m / sec, to obtain the prestressed gradient nickel-iron coating;

[0027](2) Using alumina cutting element iron-based powder to perform surface magnetic polishing on the prestressed gradient nickel-iron coating to obtain a surface roughness 0.2μm coating, and finally use a dual evaporation source microalloy ...

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Abstract

The invention discloses a preparing method of a prestressed low-temperature-resisting gradient film composite coating. Ferro-nickel atomized prealloyed powder with four kinds of components is sequentially placed in an electric spark hot flow impact spraying device from low to high according to the mass percent of nickel, a 45# steel substrate is sequentially sprayed with four layers of ferro-nickel coatings, an obtained prestressed gradient ferro-nickel coating is subjected to surface magnetic polishing treatment, finally, a dual-evaporation-source microalloy ion plating device is used for carrying out tungsten film plating, and finally, the prestressed low-temperature-resisting gradient film composite coating is obtained. The method has the advantages of being high in film thickness control precision, and high in process stability and repeatability, and the strong interface and the ultra-low-temperature strength of the film composite coating can be achieved.

Description

Technical field[0001]The invention relates to the technical field of film composite coating preparation, in particular to a method for preparing a prestressed low-temperature resistant gradient film composite coating.Background technique[0002]The ultra-low temperature (≤-196℃) toughness and wear resistance of tank ball valves used to store high-pressure combustible gases such as liquefied natural gas, petroleum gas and coal gas are important guarantees for the safe use of high-pressure combustible gases. The wear resistance and high cost of pure metals or alloy materials are the key factors that limit their wide application. Coating technology is an effective means to reduce the cost of ball valves and improve wear resistance, but the coating is prone to fall off, cracks, and surface peeling at low temperatures. The film layer composite method can improve the problem of simple coating through the buffering effect of the intermediate coating and the strong wear resistance of the film...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C14/32C23C24/08C23C28/02C23C14/02C23C14/16C22C38/08C22C19/03
CPCC22C19/03C22C38/08C23C14/025C23C14/028C23C14/16C23C14/32C23C24/085C23C28/021
Inventor 李文生翟海民何东青汤鹏君李旭强
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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