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A salt-bath niobium-chromium co-penetration agent and its application process

A technology of co-penetration agent and salt bath, which is applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of reducing coating life, increasing coating brittleness, low wear resistance, etc., to achieve brittleness The effect of reducing cracking tendency, reducing stress concentration of cladding, and improving impact resistance of cladding

Inactive Publication Date: 2015-09-30
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A single niobium layer has extremely high surface hardness and cold wear resistance, but the hardness gap between the coating and the substrate is too large. This sharp change in hardness will cause stress concentration, increase the brittleness of the coating, reduce the life of the coating, and carbonize Niobium has poor high temperature oxidation resistance
Single chromizing has good high temperature oxidation resistance, but low wear resistance

Method used

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  • A salt-bath niobium-chromium co-penetration agent and its application process
  • A salt-bath niobium-chromium co-penetration agent and its application process

Examples

Experimental program
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Effect test

Embodiment 1

[0025] A salt-bath niobium-chromium co-penetrating agent, which comprises 55% borax, 12% niobium pentoxide, 12% chromium trioxide, 6% boron carbide, 12% sodium fluoride, rare earth silicon magnesium 3% composition;

[0026] A kind of application process of salt bath niobium chromium co-penetration agent, it comprises the steps:

[0027] (1) By weight percentage, weigh 55% of borax, 12% of niobium pentoxide, 12% of chromium trioxide, 6% of boron carbide, 12% of sodium fluoride, and 3% of rare earth silicon magnesium, and set aside;

[0028] (2) According to the above ratio, add borax into the crucible, first add a small amount (such as 1 / 5 of borax) of borax, after the borax is melted, then slowly add a small amount of borax, and proceed step by step until all the borax is melted; then add Niobium pentoxide, chromium trioxide, sodium fluoride, and rare earth silicon magnesium are fully stirred until they are completely melted, and finally boron carbide is added to melt to form...

Embodiment 2

[0041] A salt-bath niobium-chromium co-penetrating agent, which comprises 68% of borax, 6% of niobium pentoxide, 10% of chromium trioxide, 4% of boron carbide, 10% of sodium fluoride, rare earth silicon magnesium 2% composition;

[0042] A kind of application process of salt bath niobium chromium co-penetration agent, it comprises the steps:

[0043] (1) By weight percentage, weigh 68% of borax, 6% of niobium pentoxide, 10% of chromium trioxide, 4% of boron carbide, 10% of sodium fluoride, and 2% of rare earth silicon magnesium for later use;

[0044](2) According to the above ratio, add borax to the crucible, first add a small amount of borax, after the borax is melted, then slowly add a small amount of borax, and proceed step by step until all the borax is melted; then add niobium pentoxide, Chromium, sodium fluoride, and rare earth silicon magnesium are fully stirred until they are all melted, and finally boron carbide is added to melt to form a salt bath, and kept for 1 h...

Embodiment 3

[0050] A salt-bath niobium-chromium co-penetrating agent, which comprises 70% of borax, 10% of niobium pentoxide, 8% of chromium trioxide, 3% of boron carbide, 8% of sodium fluoride, rare earth silicon magnesium 1% composition;

[0051] A kind of application process of salt bath niobium chromium co-penetration agent, it comprises the steps:

[0052] (1) By weight percentage, weigh 70% of borax, 10% of niobium pentoxide, 8% of chromium trioxide, 3% of boron carbide, 8% of sodium fluoride, and 1% of rare earth silicon magnesium for later use;

[0053] (2) According to the above ratio, add borax to the crucible, first add a small amount of borax, after the borax is melted, then slowly add a small amount of borax, and proceed step by step until all the borax is melted; then add niobium pentoxide, Chromium, sodium fluoride, and rare earth silicon magnesium are fully stirred until they are all melted, and finally boron carbide is added to melt to form a salt bath, and kept for 1 ho...

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Abstract

The invention relates to a salt bath niobium-chromium co-permeation agent. The salt bath niobium-chromium co-permeation agent is characterized by comprising the following components in percentage by weight: 55-70% of borax, 6-12% of niobium pentoxide, 6-12% of chromium sesquioxide, 3-6% of boron carbide, 8-12% of sodium fluoride and 1-3% of rare earth silicon and magnesium. According to a covering layer obtained by the invention, the disadvantage of large hardness gradient of a monometallic covering layer can be overcome, and meanwhile, high-hardness, high-abrasion-performance and low-fragility co-permeation gradient tissues are provided so as to meet a requirement for bearing large-load service conditions of a workpiece, so that the application range of a mold is expanded, and the service life of the mold is improved by a large margin.

Description

Technical field [0001] The invention is a chemical heat treatment field, which involves a salt bath co -seepage and its application process. Background technique [0002] Most of the machine parts or work molds affect life due to surface wear, oxidation or corrosion, so improving surface performance can significantly improve their service life.Reinforcement technology on the surface of the salt bath is good for salt bath, stable process, good treatment effect, low price, no handling process, and the osmotic layer formed has good stability, abrasion resistance, resistance to stickiness at room temperature at normal temperatureThe advantages of higher surface hardness and use of stable performance are considered to be the ideal surface enhancement technology of the industrial mold.A single seepage layer has extremely high surface hardness and cold abrasion resistance, but the gap between the cover and the substrate hardness is too large. The sharp changes in this hardness will prod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C10/26
Inventor 王华君张文杰王华昌徐德鑫李爱农孙启坤赵堃
Owner WUHAN UNIV OF TECH