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NbC reinforced nanocrystalline wear-resistant coating with hardness gradient and preparation method thereof

A technology of wear-resistant coating and hardness gradient, applied in the field of nanocrystalline wear-resistant coating and its preparation, can solve the problem that the nanocrystalline wear-resistant coating has not been published publicly, etc., and is beneficial to comprehensive mechanical properties and wear resistance. , Improve wear resistance and avoid longitudinal cracks

Active Publication Date: 2020-11-03
HUNAN UNIV OF HUMANITIES SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is still no public report on the preparation of NbC-strengthened nanocrystalline wear-resistant coatings with hardness gradients on the surface of alloy die steel by EDM.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Surface treatment of the alloy die steel base material to be used for EDM deposition, including derusting, degreasing, and if there are cracks on the surface, turning to eliminate the crack layer first;

[0019] (2) The mass fraction of carbon is 0.6%, and the steel material with cementite as the strengthening phase is used as the electrode material for EDM deposition on the surface of the alloy die steel. During the deposition process, an inert gas is used for protection. The specific process parameters of the deposition For: the output power is 2000W, the output voltage is 300V, the deposition rate is 5min / cm 2 .

[0020] (3) Use pure Nb rods as the electrode material for EDM deposition on the surface of the coating prepared in step (2), and use inert gas for protection during the deposition process. The specific process parameters for deposition are: output power 3000W, output The voltage is 300V, the deposition rate is 10min / cm 2 .

[0021] (4) Use carbon wit...

Embodiment 2

[0028] (1) Surface treatment of the alloy die steel base material to be used for EDM deposition, including derusting, degreasing, and if there are cracks on the surface, turning to eliminate the crack layer first;

[0029] (2) The mass fraction of carbon is 0.3%, and the steel material with cementite as the strengthening phase is used as the electrode material for EDM deposition on the surface of the alloy die steel. During the deposition process, an inert gas is used for protection. The specific process parameters of the deposition For: the output power is 3000W, the output voltage is 200V, the deposition rate is 8min / cm 2 .

[0030] (3) Use pure Nb rods as the electrode material for EDM deposition on the surface of the coating prepared in step (2), and use inert gas for protection during the deposition process. The specific process parameters for deposition are: output power 500W, output The voltage is 100V, the deposition rate is 10min / cm 2 .

[0031] (4) The carbon mass...

Embodiment 3

[0040] (1) Surface treatment of the alloy die steel base material to be used for EDM deposition, including derusting, degreasing, and if there are cracks on the surface, turning to eliminate the crack layer first;

[0041] (2) The mass fraction of carbon is 0.5%, and the steel material with cementite as the strengthening phase is used as the electrode material for EDM deposition on the surface of the alloy die steel. During the deposition process, an inert gas is used for protection. The specific process parameters of the deposition For: the output power is 1500W, the output voltage is 250V, the deposition rate is 10min / cm 2 .

[0042] (3) Use pure Nb rods as the electrode material for EDM deposition on the surface of the coating prepared in step (2), and use inert gas for protection during the deposition process. The specific process parameters for deposition are: output power 2000W, output The voltage is 210V, the deposition rate is 5min / cm 2 .

[0043] (4) EDM deposition...

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Abstract

The invention discloses an NbC reinforced nanocrystalline wear-resistant coating with hardness gradient and a preparation method thereof, and belongs to the field of wear-resistant coatings. The coating comprises an NbC phase and a solid solution phase of Nb in Fe, and the grain sizes of the two phases are both nanoscale. The preparation process of the coating comprises the following steps of carrying out surface treatment on an alloy die steel matrix, taking a pure Nb rod and a steel material taking cementite as a strengthening phase as electrode materials, carrying out alternate deposition on the surface of a matrix material by adopting electric spark deposition, and achieving preparation of the nanocrystalline wear-resistant coating with the hardness gradient by controlling components of the steel electrode materials and deposition process parameters. According to the coating and the preparation method, a carbon element for forming the high-hardness NbC phase comes from the steel electrode materials, and the nanocrystalline coating is obtained through the fast cooling rate of electric spark deposition, so that the defect-free large-thickness coating with the hardness gradient can be formed, and the coating has the advantages of excellent wear resistance and the like.

Description

technical field [0001] The invention relates to a wear-resistant coating and a preparation method thereof, in particular to a nanocrystalline wear-resistant coating strengthened by NbC and having a hardness gradient and a preparation method thereof. Background technique [0002] Surface engineering technology can prepare a coating or coating on the surface of a material that is different from the base material and has special properties such as excellent wear resistance and corrosion resistance. It can change the shape of the material surface and the near-surface area in the most economical and effective way. The chemical composition and organizational structure can realize the strengthening, modification, repair and remanufacturing of the material surface. This technology has been widely used in practice and has created huge economic benefits. [0003] The EDM process is a surface treatment technology that uses EDM to melt the electrode material and transfer it to the surf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C26/02B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C23C26/02
Inventor 魏祥杨泽壬陈志国郝鹏磊
Owner HUNAN UNIV OF HUMANITIES SCI & TECH
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