Composite pretreatment process for improving ion nitriding efficiency

A technology of ion nitriding and pretreatment, applied in metal material coating process, coating, solid diffusion coating and other directions, can solve the problems of slow infiltration rate and shallow infiltration layer, etc., to increase the thickness of the infiltration layer and improve the nitriding The effect of speed and compound layer thickness improvement

Inactive Publication Date: 2018-10-02
CHANGZHOU UNIV
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is: based on the problems of slow permeation speed and shallow permeation layer of the existing ion nitriding technology, the present invention provides a composite pretreatment process for improving the efficiency of ion nitriding. Composite pretreatment increases the diffusion channel of nitrogen atoms and effectively improves the efficiency of ion nitriding

Method used

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  • Composite pretreatment process for improving ion nitriding efficiency
  • Composite pretreatment process for improving ion nitriding efficiency
  • Composite pretreatment process for improving ion nitriding efficiency

Examples

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Embodiment 1

[0027] (1) Process the raw steel into a sample with a size of 10mm×10mm×5mm;

[0028] (2) Refining and tempering the sample, first raising the temperature to 860°C for 12 minutes, then oil cooling, then raising the temperature to 600°C for 30 minutes, then air cooling to room temperature;

[0029] (3) Grind the sample with 500#~2000# SiC sandpaper to the mirror surface, wash with deionized water and soak in 20ml of acetone, perform ultrasonic cleaning for 15min to remove oil, and dry it for use;

[0030] (4) Clamp the sample on the laser shock strengthening test platform, set the laser wavelength to 1064nm, the pulse width to 10ns, the laser energy to 3J, the shape of the spot to be circular, the diameter of the spot to be 3mm, and the overlapping rate of the spot to be 50%; the laser passes through the transparent flowing water The layer acts on the black tape coating coated on the surface of the sample. The black tape coating absorbs the laser energy and induces high-intensi...

Embodiment 2

[0034] (1) Process the raw steel into a sample with a size of 10mm×10mm×5mm;

[0035] (2) Refining and tempering the sample, first raising the temperature to 860°C for 12 minutes, then oil cooling, then raising the temperature to 600°C for 30 minutes, then air cooling to room temperature;

[0036] (3) Grind the sample with 500#~2000# SiC sandpaper to the mirror surface, wash with deionized water and soak in 20ml of acetone, perform ultrasonic cleaning for 15min to remove oil, and dry it for use;

[0037] (4) Clamp the sample on the laser shock strengthening test platform, set the laser wavelength to 1064nm, the pulse width to 30ns, the laser energy to 10J, the shape of the spot to be circular, the diameter of the spot to be 3mm, and the overlapping rate of the spot to be 50%; the laser passes through the transparent flowing water The layer acts on the black tape coating coated on the surface of the sample. The black tape coating absorbs the laser energy and induces high-intens...

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Abstract

The invention relates to a composite pretreatment process for improving ion nitriding efficiency. The process comprises the following steps: original-state steel is machined and cut as a sample; the sample is thermally refined and polished for ultrasonic cleaning in organic solvent and drying; the sample is impacted by laser, and is positioned in an ion nitriding furnace for vacuumizing; hydrogenis introduced for sputtering; preoxidation and ion nitriding are performed in succession; and the sample is cooled to the room temperature along with the furnace. The process has the following beneficial effects: through the first phase of laser impact, grains on the surface layer of a material are refined, the dislocation density is increased, and an ideal channel is provided for dispersion of nitrogen atoms; in the second phase, a thin layer of oxide film is formed on the surface of the material, and the oxide film is gradually reduced by hydrogen in the ion nitriding process to form a looseporous dispersion channel, so that the catalytic permeation effect is further achieved; and through laser impact and pre-oxidation compound pretreatment, the nitriding efficiency and the permeation layer thickness can be greatly improved within shorter time, so that prominent efficiency and energy saving advantages are achieved.

Description

technical field [0001] The invention relates to a compound pretreatment process for improving ion nitriding efficiency. Background technique [0002] As a widely used chemical heat treatment process, ion nitriding has the advantages of small workpiece deformation, stable quality of the permeated layer, and environmental protection, and has been widely recognized in the field of surface modification. However, the obvious shortcomings of the existing ion nitriding technology are: slow permeation speed and shallow permeation layer. In order to obtain the infiltrated layer thickness that meets the performance requirements, the time required is still very long. In order to achieve the purpose of rapid and deep nitriding, it is necessary to further explore and improve the nitriding process to improve the efficiency of ion nitriding. [0003] Laser shock is a new surface treatment technology that has emerged in recent years. It forms high-density dislocations and grain refinement...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/38C23C8/02C21D10/00C21D1/25C21D1/78
Inventor 胡静唐磊贾蔚菊
Owner CHANGZHOU UNIV
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