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Composite coating prepared by ion implantation after double-glow infiltration on steel surface and its method

A composite coating, steel surface technology, applied in the field of steel surface modification, can solve problems such as Al inability to deposit, reverse sputtering, and impermeable Al, and achieve the effects of improving comprehensive performance, saving energy resources, and extending service life

Active Publication Date: 2017-08-25
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem solved by the present invention is to use double-glow plasma surface metallurgy technology to infiltrate Al, which is prone to reverse sputtering phenomenon, so that Al cannot be deposited on the surface of the substrate, so it is difficult to perform Al infiltration operation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Present embodiment 1 is implemented under the following implementation conditions and technical requirements:

[0027] Firstly, the surface of low carbon steel Q235 is ground and polished to 1000#, and ethanol: acetone = 3:1 is used as cleaning agent for ultrasonic cleaning and drying;

[0028] Cr infiltration on the surface of low-carbon steel Q235 was then carried out by double-hui plasma surface metallurgy technology. The source electrode composition is Fe-Cr alloy, of which Fe: 60%, Cr: 40%, the distance between the source electrode and the workpiece electrode is 15mm, the vacuum is evacuated to 0.2Pa, and argon gas is introduced to start the glow and control The source voltage is 800V, the workpiece voltage is 450V, the working pressure is 30Pa, and the working time is 2h;

[0029] Al is then implanted by ion implantation. Put the Cr-infiltrated low-carbon steel Q235 obtained above and 99.99wt% pure Al into the vacuum chamber of the ion implanter, and evacuate to...

Embodiment 2

[0033] This embodiment 2 is implemented under the following implementation conditions and technical requirements:

[0034] First, grind the surface of 45# steel, polish it to 1200#, use ethanol: acetone = 4:1 as cleaning agent, carry out ultrasonic cleaning and then dry;

[0035] Then use Shuanghui plasma surface metallurgy technology to infiltrate Cr on the surface of 45# steel. The source electrode composition is Fe-Cr alloy, of which Fe: 70%, Cr: 30%, the distance between the source electrode and the workpiece electrode is 25mm, the vacuum is evacuated to 1.0Pa, and argon gas is introduced to start the glow and control The source voltage is 950V, the workpiece voltage is 550V, the working pressure is 40Pa, and the working time is 4h;

[0036] Al is then implanted by ion implantation. Put the above-mentioned 45# steel infiltrated with Cr on the surface and 99.99wt% pure Al into the vacuum chamber of the ion implanter, and evacuate to 2.0×10 -3 Pa; set voltage energy 80 k...

Embodiment 3

[0040] This embodiment 3 is implemented under the following implementation conditions and technical requirements:

[0041] Firstly, grind the surface of T8 steel, polish it to 1100#, use ethanol: acetone = 3.5: 1 as cleaning agent, carry out ultrasonic cleaning and then dry;

[0042] Then use Shuanghui plasma surface metallurgy technology to infiltrate Cr on the surface of T8 steel. The source electrode composition is Fe-Cr alloy, of which Fe: 65%, Cr: 35%, the distance between the source electrode and the workpiece electrode is 20mm, the vacuum is evacuated to 0.8Pa, and argon gas is introduced to start the glow and control The source voltage is 900V, the workpiece voltage is 500V, the working pressure is 35Pa, and the working time is 3h;

[0043] Al is then implanted by ion implantation. Put the Cr-infiltrated T8 steel obtained above and 99.99wt% pure Al into the vacuum chamber of the ion implanter, and evacuate to 1.5×10 -3 Pa; set voltage energy 65 kV, ion current dens...

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Abstract

The invention relates to a composite coating prepared by ion-implanting Al after double-glow infiltration of Cr on the steel surface and a method thereof, belonging to the field of steel surface modification. The preparation technology of the coating is carried out in two steps. Firstly, Cr is infiltrated by Shuanghui plasma surface metallurgy technology (Shuanghui for short), and then Al is injected by ion implantation technology. The purpose of using this composite technology is to take advantage of the respective advantages of the two surface modification technologies and make up for each other’s shortcomings, that is, to use the advantages of excellent bonding between the coating and the substrate and the gradient distribution of alloy elements obtained by the double-glow technology. Al technology avoids the phenomenon of anti-sputtering caused by the infiltration of Al in the double-glow technology, and realizes that the alloy elements can be distributed according to the expected design. The high-performance composite coating prepared on the surface of steel can greatly improve the surface strength, hardness, wear resistance, corrosion resistance and high temperature oxidation resistance of the material.

Description

technical field [0001] The invention belongs to the field of iron and steel surface modification, and in particular relates to the combination of Cr infiltration and Al ion implantation by double-glow plasma surface metallurgy technology to prepare a novel composite coating. Background technique [0002] Double-glow plasma surface metallurgy technology is an advanced technology for preparing surface coatings, which is characterized by using charged gas to bombard the source (pre-infiltrated metal) to sputter out atoms on its surface, and these atoms move to the surface of the workpiece at high speed under the action of an electric field , adsorbed on the surface of the workpiece, and diffuse into the surface of the workpiece at high temperature to form an alloy layer containing sputtering elements; at the same time, the charged particles activate the surface of the workpiece, that is, a large number of crystal defects such as vacancies are generated, and a structure with high...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C14/34C23C14/48C23C14/16
Inventor 姚正军罗西希张平则陈煜张泽磊吴小凤杨红勤林玉划姚一波周艳军
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS