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A salt-bath rare earth chromium-titanium compound penetrating agent and its application process

A compound infiltration and chromium-titanium technology, which is applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of reducing the service life of the coating, excessive hardness difference of the substrate, and increasing the brittleness of the coating, etc., to achieve Improve the impact resistance, increase the service life, and reduce the effect of stress concentration

Inactive Publication Date: 2019-10-01
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The single-salt bath titanium coating has extremely high surface hardness. Since titanium atoms are much larger than iron atoms, it is difficult for titanium atoms to diffuse into the substrate, resulting in a thin coating and a large hardness difference from the substrate, which easily leads to stress. Concentration increases the brittleness of the cladding. When the cladding is subjected to a large impact load, it will crack or peel off the cladding, reducing the service life of the cladding.
A single titanium coating cannot meet the requirements of high life
The single chromized coating has low hardness and low wear resistance

Method used

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  • A salt-bath rare earth chromium-titanium compound penetrating agent and its application process
  • A salt-bath rare earth chromium-titanium compound penetrating agent and its application process
  • A salt-bath rare earth chromium-titanium compound penetrating agent and its application process

Examples

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Effect test

Embodiment 1

[0028] A salt-bath rare earth chromium-titanium compound infiltrating agent, in terms of mass percentage, the chromizing agent consists of 48% barium dichloride, 24% potassium chloride, 10% chromium trioxide, 3% aluminum powder, cerium-rich rare earth 7%, sodium fluoride 8%; titanizing agent consists of barium dichloride 48%, potassium chloride 24%, titanium dioxide 10%, aluminum powder 3%, cerium-rich rare earth 7%, sodium fluoride 8% .

[0029] An application process of a salt bath rare earth chromium-titanium compound penetrating agent, which comprises the following steps:

[0030] (1) By weight percentage, weigh barium dichloride 48%, potassium chloride 24%, dichromium trioxide 10%, aluminum powder 3%, cerium-rich rare earth 7%, sodium fluoride 8%, as chromizing 48% of barium dichloride, 24% of potassium chloride, 10% of titanium dioxide, 3% of aluminum powder, 7% of cerium-rich rare earth, and 8% of sodium fluoride were weighed again and used as titanizing agent for futu...

Embodiment 2

[0039] A salt-bath rare earth chromium-titanium compound infiltrating agent, in terms of mass percentage, the chromizing agent consists of 44% barium dichloride, 22% potassium chloride, 12% chromium trioxide, 5% aluminum powder, cerium-rich rare earth 8%, sodium fluoride 9%; titanizing agent consists of barium dichloride 44%, potassium chloride 22%, titanium dioxide 12%, aluminum powder 5%, cerium-rich rare earth 8%, sodium fluoride 9% .

[0040] An application process of a salt bath rare earth chromium-titanium compound penetrating agent, which comprises the following steps:

[0041] (1) By weight percentage, weigh barium dichloride 44%, potassium chloride 22%, chromium trioxide 12%, aluminum powder 5%, cerium-rich rare earth 8%, sodium fluoride 9%, as chromizing The agent is used for standby; weigh again 44% of barium dichloride, 22% of potassium chloride, 12% of titanium dioxide, 5% of aluminum powder, 8% of cerium-rich rare earth, and 9% of sodium fluoride, and use it as ...

Embodiment 3

[0050] A salt-bath rare earth chromium-titanium compound infiltrating agent, in terms of mass percentage, the chromizing agent consists of 49% barium dichloride, 26% potassium chloride, 8% chromium trioxide, 2% aluminum powder, cerium-rich rare earth 6%, sodium fluoride 9%; titanizing agent consists of barium dichloride 49%, potassium chloride 26%, titanium dioxide 8%, aluminum powder 2%, cerium-rich rare earth 6%, sodium fluoride 9% .

[0051] An application process of a salt bath rare earth chromium-titanium compound penetrating agent, which comprises the following steps:

[0052] (1) By weight percentage, weigh barium dichloride 49%, potassium chloride 26%, chromium trioxide 8%, aluminum powder 2%, cerium-rich rare earth 6%, sodium fluoride 9%, as chromizing Agents for standby; weigh again 49% of barium dichloride, 26% of potassium chloride, 8% of titanium dioxide, 2% of aluminum powder, 6% of cerium-rich rare earth, and 9% of sodium fluoride, and use them as titanizing ag...

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Abstract

The invention relates to a salt-bath rare earth chromium-titanium composite permeating agent. The salt-bath rare earth chromium-titanium composite permeating agent is characterized in that a chromium permeating agent comprises the following components in percentages by mass: 43-49% of barium dichloride, 20-26% of potassium chloride, 8-12% of chromium sesquioxide, 2-5% of aluminum powder, 6-8% of cerium-rich rare earth and 6-10% of sodium fluoride; and the titanium permeating agent comprises the following components in percentages by mass: 43-49% of barium dichloride, 20-26% of potassium chloride, 8-12% of titanium dioxide, 2-5% of aluminum powder, 6-8% of cerium-rich rare earth and 6-10% of sodium fluoride. A coating obtained by the invention is quite high, and has quite low friction coefficient, meanwhile, hardness of the cross section of the coating is slowly changed in a gradient manner, stress concentration of the coating is reduced, embrittlement tendency is reduced, the shock resistance of the coating is improved, and the service lives of cold work die steels or mechanical parts are greatly prolonged.

Description

technical field [0001] The invention relates to the field of chemical heat treatment, in particular to a salt-bath rare earth chromium-titanium composite penetration agent and an application process thereof. Background technique [0002] The main failure modes of tools, molds or mechanical parts during the working process are wear, corrosion and fracture. And wear is the most important form of its failure. The wear failure of tools, dies or mechanical parts mainly occurs on the surface. So improving their surface properties is the most important measure to improve their life. TD (Thermal diffusion) salt bath technology has the characteristics of simple equipment, convenient operation, low investment, and obvious strengthening effect. It is considered to be an ideal surface strengthening technology for low-temperature tools, molds or mechanical parts. TiC coating has extremely high hardness and wear resistance, and has an extremely low friction coefficient. The friction co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C10/26
Inventor 潘成刚刘笃笃冯斯琦程伟伦叶传龙周家林
Owner WUHAN UNIV OF SCI & TECH
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