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Boronizing method and device for inner surface of tubular component by using direct-current electric field enhanced powder method

A DC electric field and inner surface technology, applied in metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of low utilization rate of penetrating agent, high processing temperature, long processing time, etc., and shorten the heat preservation time, reduce the temperature of boronizing, and the effect of simple device

Inactive Publication Date: 2011-08-17
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Since the generation of active boron atoms in the current solid powder boronizing is caused by the thermal decomposition of the infiltrating agent under the action of high temperature and the chemical reaction with each other, its concentration is related to the boronizing temperature, the content of boron-donating agent and activator in the infiltrating agent, etc. Direct relationship, the diffusion of boron to the surface of the part also mainly depends on the thermal diffusion of the temperature effect, so there are disadvantages such as high processing temperature, long processing time, low utilization rate of infiltrating agent, high cost, etc.

Method used

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  • Boronizing method and device for inner surface of tubular component by using direct-current electric field enhanced powder method
  • Boronizing method and device for inner surface of tubular component by using direct-current electric field enhanced powder method

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Material to be infiltrated: seamless steel pipe made of 08Cr2AlMo steel, the outer diameter of the steel pipe is 25mm, the inner diameter is 20mm, and the length is 30mm; boronizing agent composition: boron donor (boron carbide, content 2%), activator and infiltration agent (sodium fluoroborate , 2%), bulking agent (charcoal, 2%), filler and activator (silicon carbide, balance);

[0021] Fill the solid powder boronizing agent 8 composed of the above materials into the steel pipe sample 6 to be boronized on the inner wall, place the cylindrical electrode 4 in the boronizing agent, the distance between the cylindrical electrode 4 and the inner wall of the steel pipe 6 to be infiltrated is 8mm, and the two ends of the steel pipe 6 Install sealing cover 5 and insulating cover 3 at both ends of cylindrical electrode 4, and seal with refractory mud sealing material 10 again. The cylindrical electrode 4 is used as the positive pole, the steel pipe 6 is used as the negative pol...

Embodiment 2

[0024] Material to be infiltrated: seamless steel pipe made of 08Cr2AlMo steel, the outer diameter of the steel pipe is 25mm, the inner diameter is 20mm, and the length is 30mm; the composition of boronizing agent: boron supply agent (iron boron, content 5%), activator and infiltration agent (potassium fluoroborate , 5%; ammonium chloride, 2%), loosening agent (charcoal, 5%), filler and activator (silicon carbide, balance);

[0025] The boronizing method and device are the same as in Example 1, the boronizing temperature: 850°C, the boronizing time is 4 hours, the distance between the cylindrical positive electrode and the infiltrated steel pipe sample (negative electrode) is 8mm, and 35mm is applied between the cylindrical positive electrode and the infiltrated steel pipe Volts of DC electric field. Test results: 170μm boronizing layer was obtained on the inner wall of 08Cr2AlMo steel pipe, and its hardness was 1200~1700HV 0.1 ; while adopting the same infiltrating agent for...

Embodiment 3

[0027] Material to be infiltrated: seamless steel pipe made of 08Cr2AlMo steel, the outer diameter of the steel pipe is 25mm, the inner diameter is 20mm, and the length is 30mm. , 5%; ammonium chloride; 1%), loosening agent (charcoal, 5%), filler and activator (silicon carbide, balance);

[0028] The boronizing method and device are the same as in Example 1, the boronizing temperature is 700°C, the boronizing time is 4 hours, the distance between the cylindrical positive electrode and the infiltrated steel pipe sample (negative electrode) is 8mm, and the distance between the cylindrical positive electrode and the infiltrated steel pipe sample is Apply a DC electric field of 40 volts. Test results: 70μm boronizing layer was obtained on the inner wall of 08Cr2AlMo steel pipe, and its hardness was 1200~1500HV 0.1 ; while using the same infiltration agent formula, using the existing conventional powder boronizing process, the same boronizing at 700 ° C × 4 hours, the thickness of...

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Abstract

The invention discloses a boronizing method and device for the inner surface of a tubular component by using a direct-current electric field enhanced powder method. In the method, a powdery boronizing agent is filled in the tubular component to be treated; a columnar electrode is arranged in the center of the boronizing agent; two ends of the tubular component are sealed and insulated; the columnar electrode is used as a positive electrode, the tubular component is used as a negative electrode, and the two electrodes are parallel to each other; the tubular component (comprising the columnar electrode) and an anti-oxidizing filler are sealed in a boronizing box together; the boronizing box is arranged in a box type furnace for heating; meanwhile, a direct-current electric field is applied between the tubular component and the positive electrode, so that rapid boronizing on the inner surface of the tubular component can be realized. Compared with the conventional method, the method has the advantage that: the boronizing speed can be at least increased by 0.5 to 2 times at different temperatures within a range of between 550 and 950 DEG C. Therefore, the boronizing speed of the powder method on the inner surface of the metal tubular component can be increased, the boronizing temperature can be reduced, and the utilization rate of the boronizing agent can be increased by adopting the method and the device.

Description

technical field [0001] The invention belongs to a method and device for chemical heat treatment on the surface of metal parts, in particular to a method and device for boronizing the inner surface of a tubular metal part and improving the wear resistance and corrosion resistance of the inner surface by a DC electric field enhanced powder method . Background technique [0002] The inner surfaces of some tubular metal parts (such as extrusion barrels of biomaterial molding machines and pump barrels in oil extraction) are aged in ways such as wear and corrosion. It is important to improve the wear resistance and corrosion resistance of the inner surfaces by boronizing. It is a very effective and important means to improve the performance and prolong the service life of these tubular parts. [0003] The chemical heat treatment process of infiltrating boron into the surface of parts is called boronizing. The boronizing layer has high hardness, high wear resistance and certain h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/68
Inventor 谢飞潘建伟
Owner CHANGZHOU UNIV
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