Novel TD method salt bath diffusion agent with rare-earth Nd

A technology of penetrating agent and salt bath, which is applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., to achieve the effect of improving bonding force, promoting diffusion and good support effect

Inactive Publication Date: 2013-02-06
SHENYANG JIANZHU UNIVERSITY
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

The salt bath penetrating agent has not been reported in the field of material surface treatment after a preliminary search, which provides a good opportunity for the application of this technology in the future

Method used

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  • Novel TD method salt bath diffusion agent with rare-earth Nd
  • Novel TD method salt bath diffusion agent with rare-earth Nd
  • Novel TD method salt bath diffusion agent with rare-earth Nd

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Experimental program
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Embodiment Construction

[0021] Rare earth Nd is added in proportion, and neodymium is added to the TD method salt bath penetration agent. The amount of neodymium added is 0.5%-2.0% of the total amount of the TD method salt bath penetration agent.

[0022] TD method salt bath infiltration agent includes base salt, vanadium donor, activator, reducing agent, its mass percentage is base salt 75%-80%, vanadium donor 8-12%, activator 8%-12%, The reducing agent is 2%-3%, and the reducing agent is aluminum powder and neodymium.

[0023] The base salt is borax, sodium chloride, barium dichloride or their mixture, the vanadium donor is vanadium pentoxide, and the activator is sodium fluoride reducing agent.

[0024] Mix the prepared salt bath formula evenly, put it into the crucible after the temperature of the heat treatment furnace reaches 800 °C, and when the salt melts evenly and reaches the treatment temperature of 950 °C, put the workpiece into the molten salt bath and keep it warm for 4 hours to obtain ...

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Abstract

The invention belongs to the field of die surface strengthening treatment. Through the TD method treatment, a vanadium carbide (VC) coating of microns or scores of microns thick can be formed on the surface of a die; the coating is uniform in thickness and compact, and has properties of high hardness, good abrasive resistance, seizure resistance and the like; and the service life of the die can be efficiently improved. Meanwhile, the binding property of the coating and a base body can directly affect the use effect of the coating and the service life of the die. Compared with the conventional TD method salt bath diffusion agent, the novel diffusion agent with rare-earth Nd can facilitate diffusion of surface elements, improve the binding force of the coating surface, and form an obvious diffusion layer between the coating and the base body. As the hardness of the diffusion layer is higher than that of the base body, the diffusion layer can play better support role for the VC coating, the probability that the coating is stripped and broken during the service process is greatly lowered, and the purposes of improving the working quality of the die and prolonging the service life can be realized.

Description

[0001] technical field [0002] The invention relates to the technical field of metal surface treatment, in particular to a novel TD method salt bath penetration agent added with rare earth Nd. Background technique [0003] TD salt bath vanadium infiltration is one of the material surface modification treatment methods, which is widely used in the surface strengthening of molds and improving the service life of molds. The method is to start the crucible with base salt and heat it to 800~1250°C, then add a certain proportion of vanadium donor, activator and reducing agent to form a molten salt; then immerse the material to be processed in a salt bath furnace for a certain period of time , to obtain the permeable layer. During this process, the reduced active vanadium atoms are deposited on the surface of the material, forming a vanadium carbide (VC) coating of several microns to tens of microns with the carbon atoms diffused from the matrix to the surface. The coating is un...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C10/24
Inventor 陈辉李世男刘丽珍于陆宁高章玉张彦杰陈丽丽秦盼盼屈震
Owner SHENYANG JIANZHU UNIVERSITY
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