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A salt-bath rare earth chromium-titanium co-penetration agent and its application process

A technology of co-infiltration agent and chromium-titanium, which is applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., can solve the problem of low hardness of a single chromizing coating, excessive hardness difference of the substrate, and reducing the use of the coating Life and other issues, to achieve the effect of reducing operation complexity and processing time, reducing equipment costs and processing costs, and improving impact resistance

Inactive Publication Date: 2019-05-24
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 co-penetration agent and its application process
  • A salt-bath rare earth chromium-titanium co-penetration agent and its application process
  • A salt-bath rare earth chromium-titanium co-penetration agent and its application process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A salt-bath rare-earth chromium-titanium co-penetrating agent, which consists of 46% of barium dichloride, 23% of potassium chloride, 10% of titanium dioxide, 2% of chromium trioxide, 4% of aluminum powder, and cerium-rich Rare earth 7%, sodium fluoride 8%.

[0029] A kind of application technique of salt bath rare earth chromium-titanium infiltration agent, it comprises the steps:

[0030] (1) By weight percentage, weigh barium dichloride 46%, potassium chloride 23%, titanium dioxide 10%, chromium oxide 2%, aluminum powder 4%, cerium-rich rare earth 7%, sodium fluoride 8% ,spare;

[0031] (2) According to the above ratio, add barium dichloride and potassium chloride into the crucible, wait until the barium dichloride and potassium chloride melt and heat up to 850°C, then add the mixed titanium dioxide, chromium trioxide and fluoride sodium. When the temperature rises to 900°C, add a small amount of aluminum powder mixed with barium dichloride and potassium chloride ...

Embodiment 2

[0038] A salt-bath rare-earth chromium-titanium co-penetrating agent, which consists of 44% barium dichloride, 22% potassium chloride, 12% titanium dioxide, 3% chromium trioxide, 5% aluminum powder, and cerium-rich Rare earth 8%, sodium fluoride 6%.

[0039] A kind of application technique of salt bath rare earth chromium-titanium infiltration agent, it comprises the steps:

[0040] (1) By weight percentage, weigh barium dichloride 44%, potassium chloride 22%, titanium dioxide 12%, chromium oxide 3%, aluminum powder 5%, cerium-rich rare earth 8%, sodium fluoride 6% ,spare;

[0041] (2) According to the above ratio, add barium dichloride and potassium chloride into the crucible, wait until the barium dichloride and potassium chloride melt and heat up to 850°C, then add the mixed titanium dioxide, chromium trioxide and fluoride sodium. When the temperature rises to 900°C, add a small amount of aluminum powder mixed with barium dichloride and potassium chloride and cerium-rich...

Embodiment 3

[0048]A salt-bath rare-earth chromium-titanium co-penetrating agent, which consists of 48% barium dichloride, 24% potassium chloride, 8% titanium dioxide, 1% chromium trioxide, 3% aluminum powder, and cerium-rich Rare earth 6%, sodium fluoride 10%.

[0049] A kind of application technique of salt bath rare earth chromium-titanium infiltration agent, it comprises the steps:

[0050] (1) By weight percentage, weigh barium dichloride 48%, potassium chloride 24%, titanium dioxide 8%, chromium oxide 1%, aluminum powder 3%, cerium-rich rare earth 6%, sodium fluoride 10% ,spare;

[0051] (2) According to the above ratio, add barium dichloride and potassium chloride into the crucible, wait until the barium dichloride and potassium chloride melt and heat up to 850°C, then add the mixed titanium dioxide, chromium trioxide and fluoride sodium. When the temperature rises to 900°C, add a small amount of aluminum powder mixed with barium dichloride and potassium chloride and cerium-rich ...

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Abstract

The invention relates to a salt bath rare earth chromium titanium co-penetration agent. The salt bath rare earth chromium titanium co-penetration agent is characterized by comprising the following components in percentage by weight: 43-49% of barium chloride, 20-26% of potassium chloride, 8-12% of titanium dioxide, 1-3% of chromium sesquioxide, 3-5% of aluminum powder, 6-8% of cerium-rich rare earth and 6-10% of sodium fluoride. The salt bath rare earth chromium titanium co-penetration agent has the beneficial effects that a coating obtained by using the salt bath rare earth chromium titanium co-penetration agent has extremely high hardness and extremely low friction coefficients, and meanwhile, the cross section of the coating changes gradually in a gradient manner; the stress concentration of the coating is reduced; the brittle fracture tendency of the coating is reduced; the shock resistance of the coating is improved; and the service life of cold-work die steel or mechanical parts is 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 infiltration 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 coefficient...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C10/26
CPCC23C10/26
Inventor 潘成刚冯斯琦刘笃笃程伟伦叶传龙周家林
Owner WUHAN UNIV OF SCI & TECH
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