A kind of nbc/fe2b composite gradient wear-resistant coating and preparation method thereof

Abstract

The invention discloses a NbC / Fe 2 The invention discloses a composite gradient wear-resistant coating and a preparation method thereof, belonging to the field of wear-resistant coatings. The coating described in the present invention contains NbC and Fe 2 B Two kinds of hard phases, in which NbC wear-resistant coating is located on the outside of the composite coating, Fe 2 The B wear-resistant coating is located between the NbC wear-resistant coating and the base material. The preparation process includes selecting the steel material (0.3%≤C wt%≤1.2%) with cementite as the strengthening phase as the base material, and performing surface treatment on it, using pure Nb rod as the electrode material, and adopting the electric spark deposition process first A NbC strengthened nanocrystalline coating is prepared, and then the coating is subjected to solid boronizing treatment. The coating prepared in the present invention forms a gradient structure of microstructure and mechanical properties on the cross section of the workpiece, which can significantly improve the comprehensive performance of the coating. The nanocrystalline coating deposited by electric discharge contains a large number of grain boundaries and dislocations, which can Greatly lower the boronizing temperature and shorten the boronizing time.

Description

technical field

[0001] The invention relates to a wear-resistant coating and a preparation method thereof, in particular to a NbC / Fe 2 B Composite gradient wear-resistant coating and its preparation method. 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 surface of the base material to form a coating...

Examples

Embodiment 1

[0017] For NbC / Fe 2 B Composite gradient wear-resistant coating prepared steel materials with cementite as the strengthening phase (the mass fraction of carbon is 0.3%) for surface treatment, including rust removal, oil removal, and if there are cracks on the surface, first turn to eliminate cracks layer;

[0018] Pure Nb rods are used as electrode materials for EDM deposition to obtain NbC strengthened nanocrystalline coatings. During the deposition process, inert gas is used for protection. The specific process parameters of deposition are: output power 1500W, output voltage 200V, deposition rate 7min / cm 2 .

[0019] The workpiece obtained in the previous step is boronized by solid boronizing process, wherein the boronizing agent is LSB-II type boronizing agent, and the boronizing process parameters are: boronizing temperature 850°C, boronizing holding time is 300min .

[0020] The composite gradient wear-resistant coating finally prepared contains NbC and Fe 2 B Two ki...

Embodiment 2

[0023] For NbC / Fe 2 B The iron and steel material with cementite as the strengthening phase prepared by the composite gradient wear-resistant coating (the mass fraction of carbon is 1.2%) is subjected to surface treatment, including rust removal, oil removal, and if there are cracks on the surface, first turn to eliminate cracked layer;

[0024] Pure Nb rods are used as electrode materials for EDM deposition to obtain NbC-strengthened nanocrystalline coatings. During the deposition process, inert gas is used for protection. The specific process parameters of deposition are: output power 3000W, output voltage 300V, deposition rate 0.5min / cm 2 .

[0025] The workpiece obtained in the previous step is boronized by solid boronizing process, wherein the boronizing agent is LSB-II type boronizing agent, and the boronizing process parameters are: boronizing temperature 1000°C, boronizing holding time is 100min .

[0026] The composite gradient wear-resistant coating finally prepa...

Embodiment 3

[0028] For NbC / Fe 2 B The iron and steel material with cementite as the strengthening phase prepared by the composite gradient wear-resistant coating (the mass fraction of carbon is 0.8%) is subjected to surface treatment, including rust removal, oil removal, and if there are cracks on the surface, first turn to eliminate cracked layer;

[0029] Pure Nb rods are used as electrode materials for EDM deposition to obtain NbC strengthened nanocrystalline coatings. During the deposition process, inert gas is used for protection. The specific process parameters of deposition are: output power 2000W, output voltage 250V, deposition rate 8min / cm 2 .

[0030] The workpiece obtained in the previous step is boronized by solid boronizing process, wherein the boronizing agent is LSB-II type boronizing agent, and the boronizing process parameters are: boronizing temperature 1100°C, boronizing holding time is 500min .

[0031] The composite gradient wear-resistant coating finally prepare...

technical field

[0001] The invention relates to a wear-resistant coating and a preparation method thereof, in particular to a NbC / Fe 2 B Composite gradient wear-resistant coating and its preparation method. 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 surface of the base material to form a coating...

Examples

Embodiment 1

[0017] For NbC / Fe 2 B Composite gradient wear-resistant coating prepared steel materials with cementite as the strengthening phase (the mass fraction of carbon is 0.3%) for surface treatment, including rust removal, oil removal, and if there are cracks on the surface, first turn to eliminate cracks layer;

[0018] Pure Nb rods are used as electrode materials for EDM deposition to obtain NbC strengthened nanocrystalline coatings. During the deposition process, inert gas is used for protection. The specific process parameters of deposition are: output power 1500W, output voltage 200V, deposition rate 7min / cm 2 .

[0019] The workpiece obtained in the previous step is boronized by solid boronizing process, wherein the boronizing agent is LSB-II type boronizing agent, and the boronizing process parameters are: boronizing temperature 850°C, boronizing holding time is 300min .

[0020] The composite gradient wear-resistant coating finally prepared contains NbC and Fe 2 B Two ki...

Embodiment 2

[0023] For NbC / Fe 2 B The iron and steel material with cementite as the strengthening phase prepared by the composite gradient wear-resistant coating (the mass fraction of carbon is 1.2%) is subjected to surface treatment, including rust removal, oil removal, and if there are cracks on the surface, first turn to eliminate cracked layer;

[0024] Pure Nb rods are used as electrode materials for EDM deposition to obtain NbC-strengthened nanocrystalline coatings. During the deposition process, inert gas is used for protection. The specific process parameters of deposition are: output power 3000W, output voltage 300V, deposition rate 0.5min / cm 2 .

[0025] The workpiece obtained in the previous step is boronized by solid boronizing process, wherein the boronizing agent is LSB-II type boronizing agent, and the boronizing process parameters are: boronizing temperature 1000°C, boronizing holding time is 100min .

[0026] The composite gradient wear-resistant coating finally prepa...

Embodiment 3

[0028] For NbC / Fe 2 B The iron and steel material with cementite as the strengthening phase prepared by the composite gradient wear-resistant coating (the mass fraction of carbon is 0.8%) is subjected to surface treatment, including rust removal, oil removal, and if there are cracks on the surface, first turn to eliminate cracked layer;

[0029] Pure Nb rods are used as electrode materials for EDM deposition to obtain NbC strengthened nanocrystalline coatings. During the deposition process, inert gas is used for protection. The specific process parameters of deposition are: output power 2000W, output voltage 250V, deposition rate 8min / cm 2 .

[0030] The workpiece obtained in the previous step is boronized by solid boronizing process, wherein the boronizing agent is LSB-II type boronizing agent, and the boronizing process parameters are: boronizing temperature 1100°C, boronizing holding time is 500min .

[0031] The composite gradient wear-resistant coating finally prepare...

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