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Method for performing surface modification on metal by ultrasonic nano-welding

A technology of surface modification and welding method, which is applied in the field of ultrasonic nano-welding for metal surface modification and ultrasonic nano-processing. No problem, poor bonding strength of the coating, etc., to achieve the effect of easy control of welding parameters, no cracks and pores, and good interface wettability

Active Publication Date: 2012-06-20
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] After searching the documents of the prior art, it is found that the Chinese patent "Nano-coating process for metal surfaces" (application number: 200510061928.1, publication number: CN 1807685A) introduces a nano-coating process for metal surfaces. The patent reads as "Select the laser beam of the corresponding spot according to the coating area for cladding treatment, and at the same time provide synchronous inert gas protection for the laser cladding treatment area." Using this method, the performance of key components of mechanical equipment can be improved and the perishable and easy-to-wear scraps can be achieved Repair and recycling of parts, but the high-power, high-energy laser beams described are difficult and expensive to obtain
The Chinese patent "A Method for Metal Surface Modification" (Application No.: 200810055540.4, Publication No.: CN 101338429A) discloses the process of magnetophoretic deposition of a carbon nanotube suspension layer on a metal surface, and obtaining modified metals through steps such as rolling and cold embedding. method, but the interfacial wettability of carbon nanotubes and metals is not good, and the bonding strength is low
Other metal surface modification methods, such as high-speed arc spraying, nano-plating, electrochemical composite plating, physical and chemical vapor deposition, etc., most of the methods are to mechanically mix nanoparticles into the coating, which has complex technical means and coating Problems such as poor bonding strength and insignificant performance improvement

Method used

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  • Method for performing surface modification on metal by ultrasonic nano-welding
  • Method for performing surface modification on metal by ultrasonic nano-welding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Step 1, using ethanol to clean the surface of the aluminum sheet (purity is 99.99%, thickness is 500 microns);

[0034] Step 2, using the screen printing method to evenly coat silicon carbide particles on the surface of the aluminum sheet, the particle size is about 500nm, and the printing paste uses ethyl cellulose solution mixed with silicon carbide particles, the concentration is: 10% (weight), The coating thickness is 5 microns. After coating, anneal and dry the sample at 200°C for 3 hours;

[0035] Step 3, the dried screen printing sample is subjected to ultrasonic nano-welding method, the ultrasonic frequency is 20kHz, the pressure is 0.4MPa, the ceramic welding head is used, and the welding power is 10W. After welding, a modified silicon carbide surface is obtained.

[0036] After testing, the silicon carbide surface microhardness of the aluminum sheet after the surface modification treatment increases from 70HV before treatment to 130HV after treatment.

Embodiment 2

[0038] Step 1, using acetone to clean the surface of the aluminum alloy (thickness is 300 microns);

[0039] Step 2: Uniformly coat aluminum oxide particles on the surface of the aluminum alloy by spin coating, with a particle size of about 400nm. First, ultrasonically disperse the aluminum oxide particles in acetone for 10 minutes, and then use a glue shaker set at 1000rpm to disperse the dispersed particles. The acetone solution of alumina is dropped on the surface of the cleaned aluminum alloy, so that the alumina particles are evenly distributed on the surface of the aluminum alloy, and the coating thickness is 2 microns. After coating, the samples were dried at 150°C and annealed for 5 hours.

[0040] Step 3, the dried spin-coated sample is subjected to ultrasonic nano-welding method, the ultrasonic frequency is 100kHz, the pressure is 0.6MPa, the ceramic welding head is used, and the welding power is 200W. After welding, a modified silicon carbide surface is obtained.

...

Embodiment 3

[0043] Step 1, using ethanol to clean the surface of the titanium sheet (purity: 90%, thickness: 400 microns);

[0044] In step 2, silicon carbide particles are uniformly coated on the surface of the titanium sheet by screen printing, the particle size is about 300 nm, and the coating thickness is 10 microns. The printing paste uses ethyl cellulose solution mixed with silicon carbide particles, the concentration is: 10% by weight. After coating, anneal and dry the sample at 300°C for 2 hours;

[0045] Step 3, the dried titanium sheet sample is subjected to ultrasonic nano-welding method, the ultrasonic frequency is 1000kHz, the pressure is 0.9MPa, the carbide welding head, the welding power is 2000W, and the modified silicon carbide surface is obtained after welding.

[0046] After testing, the silicon carbide surface microhardness of the titanium sheet obtained after the surface modification treatment increases from 90HV before treatment to 150HV after treatment.

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Abstract

The invention relates to a method for performing surface modification on a metal by ultrasonic nano-welding and belongs to the technical field of nanomaterials. The method comprises the following steps: cleaning a to-be-treated region of the surface of the metal, coating a nanopowder material on the metal surface after cleaning, and performing ultrasonic nano-welding process on the nanopowder material on the metal surface to obtain a modified metal surface. The method is simple to operate and has controllable welding parameters. The nanomaterial and the welding region of the metal substrate form a local miscible body, leading to good interface infiltration, which enhances mechanical bonding effect and gives full play to reinforcement function of the nanomaterial. The nanomaterial is distributed densely and uniformly on the metal surface, and the surface is smooth and clean and has no cracks or air hole.

Description

technical field [0001] The invention relates to an ultrasonic nano-processing technology, in particular to a method for modifying the surface of a metal by using an ultrasonic nano-welding method, which belongs to the technical field of nano-materials. Background technique [0002] The development of modern industry has increasingly stringent requirements on metal materials, especially high-strength, friction-resistant metal surfaces have very important applications in aerospace and military industries. In addition, the oxidation and corrosion of metal surfaces not only cause damage to equipment and waste of materials, but also cause environmental pollution. Due to the characteristics of wear resistance, corrosion resistance and high hardness, nano-ceramic materials have broad application prospects in the modification of metal materials. Through surface modification of traditional metals, the strength, hardness, friction resistance and corrosion resistance of metals are sig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/10B23K20/24
Inventor 张亚非赵波张耀中徐东魏浩
Owner SHANGHAI JIAO TONG UNIV
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