A method for preparing metal matrix composite coating on stainless steel surface

Abstract

The invention discloses a method for preparing a metal-based composite coating on the surface of stainless steel. The method is to prepare a TiBCN coating on the surface of the stainless steel by means of synchronous powder feeding under the condition of an inert gas, and then use a strong current pulse to prepare a TiBCN coating. Electron beam technology uniformly polishes the laser cladding layer, and finally uses micro-arc oxidation technology to prepare an alumina ceramic layer with uniform thickness, so as to achieve high hardness and good wear resistance of the coating.

Description

technical field

[0001] The invention relates to a method for preparing a metal-based composite coating, in particular to a method for preparing a metal-based composite coating on the surface of stainless steel, and belongs to the technical field of surface modification. Background technique

[0002] 304 stainless steel (304ss) is currently considered to be one of the most important structural materials and is widely used in various high temperature environments due to their excellent mechanical properties and relatively high corrosion resistance. However, in order to extend their service life while maintaining high structural integrity, there is a growing need for increased hardness, improved wear resistance and pitting resistance.

[0003] So far, the preparation of functional coatings on the surface of 304 stainless steel is an effective method to improve its hardness, wear resistance and corrosion resistance. However, there are currently a variety of materials and deposi...

Examples

Embodiment 1

[0040] The following examples are only preferred technical solutions of the present invention, and are not intended to limit the present invention. Various modifications and variations of the present invention are possible for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

[0041] Example 1

[0042] Grind the 304 stainless steel substrate with 180#, 500#, and 1000# sandpaper in turn to obtain 304 stainless steel with a smooth surface, and then put the 304 stainless steel substrate in a muffle furnace to preheat to 600 ℃ and keep it for 1h to reduce the damage caused by the substrate and the Coating cracking due to stress caused by differences in thermal expansion between coating materials.

[0043] The TiBCN powder was dried in a vacuum drying oven at 80 °C for 1 h and kept for 12 h to obtain

[0044] P...

Embodiment 2

[0056] Grind the 304 stainless steel substrate with 180#, 500# and 1000# sandpaper in turn to obtain 304 stainless steel with a smooth surface, and then put the 304 stainless steel substrate in a muffle furnace to preheat to 600 ° C, and keep it for 1h to reduce the damage caused by the substrate and the Coating cracking due to stress caused by differences in thermal expansion between coating materials.

[0057] The TiBCN powder was dried in a vacuum drying oven at 100 °C for 1 h and kept for 12 h to obtain a powder with better fluidity.

[0058] Using laser cladding technology, the above TiBCN powder is put into the powder feeding tank, and argon gas is used as the carrier gas to carry the TiBCN powder to the laser nozzle. The laser power is 1400W and the scanning speed is 5mm / s, the powder feeding rate is 280mg / s.

[0059] Polish the prepared laser cladding coating with 180#, 500#, and 1000# sandpaper on a polishing machine to remove the surface oxide layer and unmelted pa...

Embodiment 3

[0068] Grind the 304 stainless steel substrate with 180#, 500# and 1000# sandpaper in turn to obtain 304 stainless steel with a smooth surface, and then put the 304 stainless steel substrate in a muffle furnace to preheat to 600 ° C, and keep it for 1h to reduce the damage caused by the substrate and the Coating cracking due to stress caused by differences in thermal expansion between coating materials.

[0069] The TiBCN powder was dried in a vacuum drying oven at 120 °C for 1 h and kept for 12 h to obtain

[0070] Powder with better flow.

[0071] Using laser cladding technology, the above TiBCN powder is put into the powder feeding tank, and argon is used as the carrier gas to carry the TiBCN powder to the laser nozzle. The laser power is 1300W and the scanning speed is 6mm / s, the powder feeding rate is 250mg / s.

[0072] Polish the prepared laser cladding coating with 180#, 500#, and 1000# sandpaper on a polishing machine to remove the surface oxide layer and unmelted pa...

technical field

[0001] The invention relates to a method for preparing a metal-based composite coating, in particular to a method for preparing a metal-based composite coating on the surface of stainless steel, and belongs to the technical field of surface modification. Background technique

[0002] 304 stainless steel (304ss) is currently considered to be one of the most important structural materials and is widely used in various high temperature environments due to their excellent mechanical properties and relatively high corrosion resistance. However, in order to extend their service life while maintaining high structural integrity, there is a growing need for increased hardness, improved wear resistance and pitting resistance.

[0003] So far, the preparation of functional coatings on the surface of 304 stainless steel is an effective method to improve its hardness, wear resistance and corrosion resistance. However, there are currently a variety of materials and deposi...

Examples

Embodiment 1

[0040] The following examples are only preferred technical solutions of the present invention, and are not intended to limit the present invention. Various modifications and variations of the present invention are possible for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

[0041] Example 1

[0042] Grind the 304 stainless steel substrate with 180#, 500#, and 1000# sandpaper in turn to obtain 304 stainless steel with a smooth surface, and then put the 304 stainless steel substrate in a muffle furnace to preheat to 600 ℃ and keep it for 1h to reduce the damage caused by the substrate and the Coating cracking due to stress caused by differences in thermal expansion between coating materials.

[0043] The TiBCN powder was dried in a vacuum drying oven at 80 °C for 1 h and kept for 12 h to obtain

[0044] P...

Embodiment 2

[0056] Grind the 304 stainless steel substrate with 180#, 500# and 1000# sandpaper in turn to obtain 304 stainless steel with a smooth surface, and then put the 304 stainless steel substrate in a muffle furnace to preheat to 600 ° C, and keep it for 1h to reduce the damage caused by the substrate and the Coating cracking due to stress caused by differences in thermal expansion between coating materials.

[0057] The TiBCN powder was dried in a vacuum drying oven at 100 °C for 1 h and kept for 12 h to obtain a powder with better fluidity.

[0058] Using laser cladding technology, the above TiBCN powder is put into the powder feeding tank, and argon gas is used as the carrier gas to carry the TiBCN powder to the laser nozzle. The laser power is 1400W and the scanning speed is 5mm / s, the powder feeding rate is 280mg / s.

[0059] Polish the prepared laser cladding coating with 180#, 500#, and 1000# sandpaper on a polishing machine to remove the surface oxide layer and unmelted pa...

Embodiment 3

[0068] Grind the 304 stainless steel substrate with 180#, 500# and 1000# sandpaper in turn to obtain 304 stainless steel with a smooth surface, and then put the 304 stainless steel substrate in a muffle furnace to preheat to 600 ° C, and keep it for 1h to reduce the damage caused by the substrate and the Coating cracking due to stress caused by differences in thermal expansion between coating materials.

[0069] The TiBCN powder was dried in a vacuum drying oven at 120 °C for 1 h and kept for 12 h to obtain

[0070] Powder with better flow.

[0071] Using laser cladding technology, the above TiBCN powder is put into the powder feeding tank, and argon is used as the carrier gas to carry the TiBCN powder to the laser nozzle. The laser power is 1300W and the scanning speed is 6mm / s, the powder feeding rate is 250mg / s.

[0072] Polish the prepared laser cladding coating with 180#, 500#, and 1000# sandpaper on a polishing machine to remove the surface oxide layer and unmelted pa...

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