Rapid QPQ (Quench-Polish-Quench) treatment method of application electric field and equipment thereof

A processing method and technology of processing equipment, applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve problems such as being unfavorable to improve wear resistance, corrosion resistance, thin infiltration layer, etc., and reduce composite processing. effect of time, reducing nitriding temperature, increasing concentration and activity

Inactive Publication Date: 2013-07-10
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional QPQ treatment technology has a thin permeated layer, which cannot meet the needs of workpieces that are subject to friction and wear and require good corrosion resistance.
Although increasing the nitriding temperature and holding time can increase the thickness of the infiltrated layer to a certain extent, it will make the infiltrated layer loose, which is not conducive to improving its wear resistance and corrosion resistance.

Method used

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  • Rapid QPQ (Quench-Polish-Quench) treatment method of application electric field and equipment thereof
  • Rapid QPQ (Quench-Polish-Quench) treatment method of application electric field and equipment thereof
  • Rapid QPQ (Quench-Polish-Quench) treatment method of application electric field and equipment thereof

Examples

Experimental program
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Effect test

Embodiment 1）

[0031] A fast QPQ processing method for applying an electric field, the method may further comprise the steps:

[0032] 1) Smooth the surface of sample 5 to be treated with 400#~2000# SiC sandpaper in sequence;

[0033] 2) Use absolute ethanol or acetone to perform ultrasonic cleaning on the sample 5 to be treated for 15 minutes to remove oil and impurities on the surface of the sample 5 to be treated, and dry it for use;

[0034] 3) Put the sample 5 to be treated into the resistance furnace for pre-oxidation for 20~30min;

[0035] 4) Heat the pit furnace 3 to 450-500°C for heat preservation, and heat up to the nitriding temperature after the nitriding base salt in the crucible 4 is fully melted;

[0036] 5) Using the base salt as the nitriding agent, place a plate-shaped electrode 6 designed according to the layman’s design of the sample 5 to be treated in the salt bath, use this electrode as the positive electrode, and the sample 5 to be processed as the negative electrode,...

Embodiment 2）

[0042] 1) Smooth the surface of sample 5 to be treated with 400#~2000# SiC sandpaper in sequence;

[0043] 2) Use absolute ethanol or acetone to perform ultrasonic cleaning on the sample 5 to be treated for 15 minutes to remove oil and impurities on the surface of the sample 5 to be treated, and dry it for use;

[0044] 3) Put the sample 5 to be treated into the resistance furnace for pre-oxidation for 20~30min;

[0045] 4) Heat the pit furnace 3 to 450-500°C for heat preservation, and heat up to the nitriding temperature after the nitriding base salt in the crucible 4 is fully melted;

[0046]5) Use the base salt as the nitriding agent, place a plate-shaped electrode 6 designed according to the shape of the sample to be treated in the salt bath, use the plate-shaped electrode 6 as the positive electrode, and use the part as the negative electrode. The two electrodes are parallel to each other. The distance between the electrode 6 and the sample 5 to be treated is 20mm, and t...

Embodiment 3）

[0051] 1) Smooth the surface of sample 5 to be treated with 400#~2000# SiC sandpaper in sequence;

[0052] 2) Use absolute ethanol or acetone to perform ultrasonic cleaning on the sample 5 to be treated for 15 minutes to remove oil and impurities on the surface of the sample 5 to be treated, and dry it for use;

[0053] 3) Put the sample 5 to be treated into the resistance furnace for pre-oxidation for 20~30min;

[0054] 4) Heat the pit furnace 3 to 450-500°C for heat preservation, and heat up to the nitriding temperature after the nitriding base salt in the crucible 4 is fully melted;

[0055] 5) Using the base salt as the nitriding agent, place a plate-shaped electrode 6 designed according to the shape of the sample 5 to be treated in the salt bath, use the electrode as the positive electrode, and the sample 5 to be processed as the negative electrode, and the two electrodes are parallel to each other. The distance between the shape electrode 6 and the sample 5 to be treate...

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Abstract

The invention relates to a metal surface chemical thermal treatment process and equipment, and in particular relates to a rapid QPQ (Quench-Polish-Quench) treatment method and equipment thereof for improving the surface property of a metal by adding a direct current electric field. The method comprises the following steps of: taking a profiling plate electrode which is arranged parallel to a surface (of a part) to be nitrided in a salt bath nitriding agent as the anode of the electric field, taking a metal piece to be nitrided as the cathode, putting the anode and the cathode into a pit furnace with the salt bath, heating the anode and the cathode, and at the same time applying the direct current electrode field to the metal piece to be nitrided and the anode so as to realize rapid nitridation. Compared with an ordinary QPQ technique, the method can increase the nitridation speed, reduce the nitridation temperature and improve the utilization rate of the nitriding agent at different temperatures within the range of 510 DEG C to 580 DEG C. Therefore, the method can take the place of multiple processes of high-frequency quenching cemented quenching, tempering, blackening (chroming) and the like, and the strength of automobiles and industrial dies can be remarkably improved when the method is applied to the industries, so that the service lives of the automobiles and industrial dies are greatly prolonged, and the production cost is lowered.

Description

technical field [0001] The invention relates to a metal surface chemical heat treatment process and equipment, in particular to a fast QPQ treatment method and equipment for improving metal surface properties by adding a direct current electric field. Background technique [0002] QPQ compound salt bath treatment technology is a new metal surface chemical heat treatment technology, which mainly includes two processes of salt bath nitriding and salt bath oxidation. First, decompose the nitride-based salt at a certain temperature to form active nitrogen atoms, thereby forming a high-concentration nitrogen potential area in the salt bath, nitrogen atoms diffuse to the metal surface and participate in the reaction on the surface to form wear resistance and corrosion resistance. Excellent compound layer, and then put the nitrided workpiece into the oxidation salt bath for oxidation treatment. The QPQ composite treatment technology is evolved from the salt bath nitriding technolog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/58
Inventor 胡静周正寿沈志远解后润
Owner CHANGZHOU UNIV
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