A method for preparing a hydrogen-free composite modified layer on a steel surface

A compound modification and steel technology, which is applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve the problems of poor bonding performance, slow preparation speed, unfriendly environment, etc., and achieve high reliability and preparation The effect of low cost and good wear resistance

Active Publication Date: 2020-04-17
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The patent does not refer to the outer surface having a self-lubricating carbon layer
④ The spraying method can be used to deposit titanium carbide on the surface of steel-based parts. The spraying preparation methods include arc spraying, plasma spraying, supersonic spraying and other methods. The advantages of the spraying method are that the preparation speed of the coating is fast and the thickness can be between several microns and several millimeters. The time is controlled according to the actual situation, but the bonding method between the sprayed coating and the substrate is mainly mechanical bonding rather than metallurgical bonding, and the bonding performance is relatively poor
[0004] The above method is used to prepare titanium carbide in non-titanium matrix components. Although it has been applied to a certain extent, it has some shortcomings, such as the method for preparing titanium carbide by CVD is not friendly to the environment, and the method for preparing titanium carbide by physical vapor deposition is thin and single. The difference in expansion coefficient between the titanium carbide coating and the steel base, the coating is prone to failure
The method of injection infiltration is slow to prepare, and the sprayed coating obtained by the method has poor bonding performance with the substrate

Method used

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  • A method for preparing a hydrogen-free composite modified layer on a steel surface
  • A method for preparing a hydrogen-free composite modified layer on a steel surface
  • A method for preparing a hydrogen-free composite modified layer on a steel surface

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Experimental program
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Effect test

Embodiment 1

[0025] The preparation method of the present embodiment comprises the following steps:

[0026] Step 1. Pretreatment: Pickling, mechanical polishing, degreasing cleaning and drying treatment are carried out on the surface of the 316L stainless steel workpiece in sequence;

[0027] Step 2, titanium infiltration: the 316L stainless steel workpiece pretreated in step 1 is placed on the workpiece pole stage of the vacuum chamber of the double-layer glow plasma metal infiltration equipment, with the pure titanium plate as the source, the 316L stainless steel The workpiece is the working pole, the distance between the pure titanium plate and the 316L stainless steel workpiece is 10mm, and then pre-evacuated to 5×10 -2 Pa, heat the temperature of the 316L stainless steel workpiece to 400°C, keep it warm for 15 minutes, then pass argon gas into the furnace, adjust the pressure in the furnace to 20Pa, the loading voltage of the source electrode is 850V, and the loading voltage of the w...

Embodiment 2

[0036] The preparation method of the present embodiment comprises the following steps:

[0037] Step 1, pretreatment: pickling, mechanical polishing, degreasing cleaning and drying treatment are carried out sequentially on the surface of the 25# steel workpiece;

[0038] Step 2, titanium infiltration: place the pretreated 25# steel workpiece in step one on the workpiece pole stage of the vacuum chamber of the double-layer glow plasma metal infiltration equipment, and use the pure titanium plate as the source electrode, and the 25# The #steel workpiece is the working pole, and the distance between the pure titanium plate and the 25# steel workpiece is 12mm, and then pre-evacuated to 1×10 -2 Pa, heat the temperature of the 25# steel workpiece to 500°C, keep it warm for 15min, then pass argon into the furnace, adjust the pressure in the furnace to 25Pa, the loading voltage of the source electrode is 800V, and the loading voltage of the working electrode is 450V, Continue heating...

Embodiment 3

[0044] The preparation method of the present embodiment comprises the following steps:

[0045] Step 1, pretreatment: pickling, mechanical polishing, degreasing cleaning and drying treatment are carried out sequentially on the surface of the 45# steel workpiece;

[0046] Step 2, titanium infiltration: place the pretreated 45# steel workpiece in step one on the workpiece pole stage of the vacuum chamber of the double-layer glow plasma metal infiltration equipment, and use the TA1 titanium plate as the source, and the The 45# steel workpiece is the working pole, the distance between the TA1 titanium plate and the 45# steel workpiece is 20mm, and then pre-evacuated to 7×10 -2 Pa, heat the temperature of the 45# steel workpiece to 300°C, keep it warm for 20min, then feed argon gas into the furnace, adjust the pressure in the furnace to 50Pa, the loading voltage of the source electrode is 900V, and the loading voltage of the working electrode is 400V, Continue to heat the temperat...

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Abstract

The invention discloses a preparation method of a hydrogen-free compound modification layer on the surface of steel. The preparation method comprises the following steps of 1, pretreatment: performingpretreatment on the surface of a steel based workpiece; 2, inleakage of titanium: putting the steel based workpiece after pretreatment on a workpiece electrode carrying table of a vacuum chamber of double glow plasma surface alloying equipment, and performing inleakage of the titanium by taking a pure titanium plate as a source electrode and the steel based workpiece as a working electrode; and 3, carburization: after inleakage of the titanium is finished, changing the source electrode with high-purity graphite, performing carburization, stopping heating the steel based workpiece after carburization is finished, performing deposition on the steel based workpiece for 1-100min to form a carbon deposition layer, and forming the hydrogen-free compound modification layer on the surface of thesteel based workpiece finally. According to the preparation method provided by the invention, the the hydrogen-free compound modification layer which is composed of hydrogen-free titanium carbide, ferrite, carbide and free carbon is prepared on the surface of the steel based workpiece, and the hydrogen-free compound modification layer has the effects of wear resistance and reduction; and the method is environmentally friendly, can be realized by one double glow plasma surface alloying equipment and is high in reliability and low in preparation cost.

Description

technical field [0001] The invention belongs to the technical field of metal material surface treatment, and in particular relates to a method for preparing a hydrogen-free composite modified layer on the surface of steel. Background technique [0002] Titanium carbide has a high melting point, high hardness and high wear and corrosion resistance, and is widely used in various wear-resistant parts and parts, and is also widely used in the wear protection of parts and parts. For titanium parts, the main way to form the titanium carbide layer on the surface is to form titanium carbide in situ on the titanium substrate by means of diffusion and infiltration under vacuum or low pressure. In order to avoid the hidden danger of hydrogen embrittlement, "a titanium surface glow ion without In the invention patent of "carburizing process method" (publication number CN 1451779A), the method of glow plasma carburizing is used to form a hydrogen-free carburizing layer on the surface of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C12/00
CPCC23C12/00
Inventor 姬寿长李争显王彦锋畅晨阳李宏战王浩楠
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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