Method for directly growing nano-crystal chromium nitride film on steel products

A nanocrystalline and chromium nitride technology, applied in metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of complex technology, retention, and difficulty in industrialized mass production, and achieve low temperature and energy saving , Broaden the effect of industrial application prospects

Inactive Publication Date: 2008-03-26
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

In addition, although there are many methods for preparing nanomaterials, most of them are technically complicated and only stay in the laboratory research stage, and there are certain difficulties in industrial mass production.
Therefore, people began to study the method of nano-material surface, but so far, the method of directly growing nanocrystalline chromium nitride film on the steel surface has not been reported.

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  • Method for directly growing nano-crystal chromium nitride film on steel products

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Embodiment 1

[0039] 20 steel, after normalizing, then pre-treat the surface, polish and degrease. Then carry out ion nitriding at 540°C for 8 hours. The ion nitriding uses a bell-type furnace with a low vacuum of 50Pa and a medium of 0.5m 3 / h ammonia gas. After cooling to room temperature with the furnace, the surface is slightly cleaned, and then chromized in a salt bath at 650 ° C for 3 hours. The salt bath chromizing step is as follows: first melt the uniformly mixed base salt at about 620°C in the crucible (add CrCl at this temperature 3 ·6H 2 O, can reduce volatilization), and then gradually, in small batches, slowly add CrCl to the molten base salt 3 ·6H 2 O; to be added to all CrCl 3 ·6H 2 After adding O to the molten base salt, keep it warm until CrCl 3 ·6H 2 O and the base salt are completely melted and stirred evenly; then the temperature control is adjusted to a pretreatment temperature of 650°C, and the evenly mixed Cr powder, Fe powder and Si powder are added to the sa...

Embodiment 2

[0041] 20 steel, after normalizing, then pre-treat the surface, polish and degrease. Then carry out ion nitriding at 540°C for 8 hours. The ion nitriding uses a bell-type furnace with a low vacuum of 50Pa and a medium of 0.5m 3 / h ammonia gas. After cooling to room temperature with the furnace, the surface is slightly cleaned, and then chromized in a salt bath at 650 ° C for 6 hours. The salt bath chromizing step is as follows: first melt the uniformly mixed base salt at about 620°C in the crucible (add CrCl at this temperature 3 ·6H 2 O, can reduce volatilization), and then gradually, in small batches, slowly add CrCl to the molten base salt 3 ·6H 2 O; to be added to all CrCl 3 ·6H 2 After adding O to the molten base salt, keep it warm until CrCl 3 ·6H 2 O and the base salt are completely melted and stirred evenly; then the temperature control is adjusted to a pretreatment temperature of 650°C, and the evenly mixed Cr powder, Fe powder and Si powder are added to the s...

Embodiment 3

[0043] 20 steel, after normalizing, then pre-treat the surface, polish and degrease. Then carry out ion nitriding at 540°C for 8 hours. The ion nitriding uses a bell-type furnace with a low vacuum of 50Pa and a medium of 0.5m 3 / h ammonia gas. After cooling to room temperature with the furnace, the surface is slightly cleaned, and then chromized in a salt bath at 580 ° C for 12 hours. The salt bath chromizing step is as follows: first melt the uniformly mixed base salt at 620°C in the crucible (add CrCl at this temperature 3 ·6H 2 O, can reduce volatilization), and then gradually, in small batches, slowly add CrCl to the molten base salt 3 ·6H 2 O; to be added to all CrCl 3 ·6H 2 After adding O to the molten base salt, keep it warm until CrCl 3 ·6H 2 O and the base salt are completely melted and stirred evenly; then the temperature control is adjusted to the pretreatment temperature of 580°C, and the evenly mixed Cr powder, Fe powder and Si powder are added to the salt...

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Abstract

The process of growing nanometer crystalline chromium nitride film directly on steel includes the first nitriding and the salt bath chromizing of the nitrided steel at 500-650 deg.c after being cooled to room temperature and surface washing. The salt bath fluid for salt bath chromizing has base salt comprising NaC l20-25 wt%,BaCl2 30-35 wt% and CaCl2 40-50 wt%; and effective components including Cr powder 10-20 wt% of the base salt, Fe powder 5-10 wt% of the base salt, CrCl3.6H2O 25-50 wt% of the base salt, and Si powder 5-10 wt% of the base salt. The process grows nanometer crystalline CrN film directly on steel, and the film has great base bonding force, effect of reducing friction, fast growing speed and high suitability of steel types.

Description

Technical field: [0001] The invention relates to a material surface treatment method, in particular to a steel surface nanometerization method, that is, a method for directly growing a nanocrystalline chromium nitride film on the steel. Background technique: [0002] Since most of the failures (eg, fatigue, corrosion, wear, etc.) occur on the surface of materials, the surface modification of materials has been widely valued by researchers. Nanostructured surface is a research hotspot because of its good tensile, anti-fatigue, anti-wear and corrosion properties. According to the different synthesis mechanisms of nanomaterials, the existing nanomaterial surface nanotechnology methods can be divided into three categories: the first category is nanotechnology based on various surface coatings or deposition techniques, such as physical / chemical vapor deposition (PVD / CVD), and electroplating, etc., the key to this type of method is to ensure the firm combination between the nano...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F17/00C23C8/26C23C10/24C21D1/00
Inventor 曹辉亮伍翠兰刘江文邹敢锋罗承萍
Owner SOUTH CHINA UNIV OF TECH
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