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Aluminum-boron nitride nanosheet composite coating and preparation method thereof

A composite coating, boron nitride technology, applied in pressure inorganic powder coating and other directions, to increase resistance, improve service life, and inhibit the infiltration of corrosive media

Pending Publication Date: 2021-02-19
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Currently widely used pure Al anti-corrosion coatings (such as patents CN104120377A, CN200510047631.X, etc.) can protect marine equipment, but there is still a lot of room for improvement in their seawater corrosion resistance

Method used

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  • Aluminum-boron nitride nanosheet composite coating and preparation method thereof
  • Aluminum-boron nitride nanosheet composite coating and preparation method thereof
  • Aluminum-boron nitride nanosheet composite coating and preparation method thereof

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preparation example Construction

[0036] A method for preparing an aluminum-boron nitride nanosheet composite coating, using Al-BNNSs composite powder as a raw material, depositing the composite powder onto a substrate by cold spraying to obtain a composite coating, and performing heat treatment on the composite coating to obtain BNNSs The evenly distributed Al-BNNSs composite coating specifically comprises the following steps:

[0037] Step 1: Perform high-energy ball milling on hexagonal boron nitride (h-BN) and then ultrasonically disperse it to prepare BNNSs;

[0038] Step 2: BNNSs and Al powder are mixed and ball-milled to prepare BNNSs / Al composite powder, and the Al particle size is 10-65 μm;

[0039] Step 3: Use BNNSs / Al as the raw material for spraying composite powder, and use a nitrogen circulation cold spray system to prepare a composite coating; add stainless steel balls to the BNNSs / Al composite powder for ball milling and mix, and use a nitrogen circulation cold spray system to prepare a composi...

Embodiment

[0043] The invention innovatively proposes an Al-BNNSs composite coating with Al as a matrix and BNNSs as a reinforcing phase, and a preparation method combining ball milling, cold spraying, in-situ micro-forging technology and heat treatment.

[0044] Composite coating preparation method of the present invention specifically comprises the following steps:

[0045] Step 1: Put the h-BN powder in the ball milling jar, put 100ml alcohol and 10g h-BN in each ball milling jar, the ratio of ball to material is 20:1, and the weight ratio of large, medium and small grinding balls is 5:3:2 respectively. The diameters of the grinding balls are 15mm, 10mm, and 5mm respectively. The material of the ball milling tank and the grinding balls are all stainless steel; the atmosphere of the ball milling is Ar gas; The running time for each time is set to 2min, and the single pause time is set to 2min; after the ball milling is completed, the ball milling liquid is taken out for ultrasonic disp...

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Abstract

The invention discloses an aluminum-boron nitride nanosheet composite coating and a preparation method thereof, and belongs to the field of materials. The thickness of the coating is 0.5-2.0 mm, aluminum (Al) particles in the coating are lamellar, and two-dimensional boron nitride nanosheets (BNNSs) are uniformly distributed in an Al deposition body. The BNNSs have the characteristics of self-lubrication and high chemical stability and can be used as a physical barrier in the coating to prevent a corrosive medium from entering a matrix, and thus the wear resistance and corrosion resistance ofthe coating can be obviously enhanced. The preparation method of the coating mainly comprises the following steps that 1, hexagonal boron nitride (h-BN) is subjected to high-energy ball milling and then is subjected to ultrasonic dispersion to prepare BNNSs; 2, the spherical Al powder and BNNSs are subjected to ball-milling and mixing to obtain composite powder; 3, the composite powder is deposited on the matrix by using a cold spraying process to obtain an Al-BNNSs composite coating with uniformly distributed BNNSs; and 4, the coating is subjected to heat treatment to further improve the performance of the composite coating. The coating is wide in application range, simple in preparation method and capable of achieving large-scale preparation, and has great application value and market prospects.

Description

technical field [0001] The invention relates to the technical field of composite material coating preparation, in particular to an aluminum-boron nitride nanosheet composite coating and a preparation method thereof. Background technique [0002] Many marine equipment, such as ships, offshore platforms, sea-crossing bridges, submarine oil and gas pipelines, etc., are facing serious corrosion problems. According to statistics, the global annual loss due to corrosion is as high as 1.4-2.2 trillion US dollars, and the total amount of scrapped steel products due to corrosion is equivalent to 1 / 3 of the steel output. Therefore, the development of marine engineering equipment with excellent seawater corrosion resistance is of great significance to the development of my country's national economy, especially the development of marine economy. Although pure Al anti-corrosion coatings widely used at present (such as patents CN104120377A, CN200510047631.X, etc.) can protect marine equ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/04B22F9/04
CPCC23C24/04B22F9/04B22F2009/043
Inventor 李瑞涛张斌张成何培瑜刘宏陈尚爽杨志涛万伟超朱奕帆
Owner JIANGSU UNIV
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