Preparation method of iron-based vanadium carbide coating

A technology of vanadium carbide and coating, which is applied in the direction of coating, metal material coating technology, etc., can solve the problems of strict process control, complex process, and difficulty in product defect control, so as to achieve simple process, reduce incomplete reaction, The effect of improving mechanical properties

Inactive Publication Date: 2020-05-19
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method first needs to pre-deposit a layer of diamond coating with a certain thickness on the surface of the coating substrate, and use the coating as an intermediate medium. The second step of vacuum evaporation will make the metal adhere to the coating surface, or with the The coating undergoes a secondary reaction to generate metal carbides, and finally forms a diamond / metal carbide composite coating. The process is complex and the process is strictly controlled, which greatly affects the difficulty of product defect control.

Method used

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Examples

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preparation example Construction

[0022] Specifically, the invention provides a method for preparing an iron-based vanadium carbide coating. The method comprises the steps of:

[0023] a. Vaporizing vanadium chloride into gaseous vanadium chloride at 300-500°C;

[0024] b. Under argon or helium with a purity ≥ 99.99%, mix gaseous vanadium chloride with CH 4 The molar ratio of the gas is 1:0.8~2.5, and the spraying pressure is controlled by the spray gun to be 1.0~5.0MPa to spray out and gather on the surface of the iron substrate with a preheating temperature of 500~1000°C;

[0025] c. Turn on the laser beam and control the energy density of the laser beam to 80-250J / mm 3 , the surface of the iron substrate is melted, the carbonization reaction generates vanadium carbide, and the vanadium carbide adheres to the surface of the molten iron substrate to form an iron-based vanadium carbide coating.

[0026] In step a of the present invention, the vanadium chloride is VCl 4 , VCl 3 or VCl 2 at least one of th...

Embodiment 1

[0034] Rapidly vaporize vanadium chloride with a purity of 99.5% at 300°C, and gaseous vanadium chloride and CH 4 The gas is sprayed to the surface of the metal iron substrate with a preheating temperature of 500°C at a molar ratio of 1:0.9. Turn on the laser beam, while the laser energy density is 80J / mm 3 Under certain conditions, the surface temperature of the iron substrate is controlled to be ≥ 1500°C for carbonization reaction, and the reaction produces vanadium carbide that adheres to the surface of the molten iron substrate to form an iron-based vanadium carbide coating. The thickness of the obtained vanadium carbide coating is 16 μm, and the relative density of the coating is is 5.69, the oxygen content of the coating is 0.10%, and the primary utilization rate of vanadium chloride is 34.4%.

Embodiment 2

[0036] Rapidly vaporize vanadium chloride with a purity of 99.8% at 450°C, and gaseous vanadium chloride and CH 4 The gas is sprayed to the surface of the metal iron substrate with a preheating temperature of 600°C at a molar ratio of 1:1.3. Turn on the laser beam, when the laser energy density is 130J / mm 3 Under certain conditions, the surface temperature of the iron substrate is controlled to be ≥ 1500°C for carbonization reaction, and the reaction produces vanadium carbide which adheres to the surface of the molten iron substrate to form an iron-based vanadium carbide coating. The single layer thickness of the obtained vanadium carbide coating is 30 μm, and the relative density of the coating is 5.70, the oxygen content of the coating is 0.10%, and the primary utilization rate of vanadium chloride is 65.2%.

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Abstract

The invention belongs to the technical field of metallurgy, specifically relates to a preparation method of an iron-based vanadium carbide coating and aims at providing a method capable of quickly preparing the iron-based vanadium carbide coating. The method includes the following steps that a, vanadium chloride is gasified into gaseous vanadium chloride; b, in a protective atmosphere, the gaseousvanadium chloride and CH4 gas are sprayed out through a spray gun and gathered to the preheated surface of an iron matrix; and c, a laser beam is started, the energy density of the laser beam is controlled between 80 j/mm3 and 250 j/mm3, the surface of the iron matrix is melted, a carbonization reaction happens to generate vanadium carbide, the vanadium carbide is attached to the molten surface of the iron matrix, and the iron-based vanadium carbide coating is formed. By the adoption of the method, the vanadium carbide coating can be quickly prepared at one time, carbide of the prepared iron-based vanadium carbide coating can be further precipitated at a fixed point in iron and iron alloy through a thermal treatment technology, and therefore the mechanical property of steel and corresponding vanadium-contained microalloyed steel is improved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a preparation method of an iron-based vanadium carbide coating. Background technique [0002] Vanadium carbide has the general characteristics of transition metal carbides such as high hardness, melting point and high temperature strength, as well as good electrical and thermal conductivity. It is widely used in iron and steel metallurgy, hard alloys, electronic products, catalysts and high temperature coating materials. Has a wide range of applications. As a common additive in steel, vanadium carbide can improve the comprehensive properties of steel such as wear resistance, corrosion resistance, toughness, strength, ductility and thermal fatigue resistance; at the same time, because of its high activity, selectivity, stability Vanadium carbide has also been widely used as a new type of catalyst because of its high performance and ability to resist "catalyst poiso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C26/00
CPCC23C26/00
Inventor 余彬叶明峰景涵师启华
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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