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Method for preparing TiC/TiB wear-resisting coating in in-situ manner through laser cladding

A technology of laser cladding and wear-resistant coating, which is applied in coating, metal material coating process, etc., can solve the problems of coarse coating grain, easy cracking of coating, poor bonding strength between coating and substrate, etc., to achieve Improvement of wear resistance, effect of improving hardness and wear resistance

Active Publication Date: 2020-04-14
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide an in-situ laser cladding method to solve the shortcomings of the coatings prepared in the prior art, such as easy cracking of the coating, coarse grains in the coating, and poor bonding strength between the coating and the substrate. The method of TiC / TiB wear-resistant coating

Method used

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  • Method for preparing TiC/TiB wear-resisting coating in in-situ manner through laser cladding
  • Method for preparing TiC/TiB wear-resisting coating in in-situ manner through laser cladding
  • Method for preparing TiC/TiB wear-resisting coating in in-situ manner through laser cladding

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Experimental program
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Effect test

Embodiment 1

[0045] The mass percent of the cladding material used in the wear-resistant coating is: 85% pure titanium powder with a particle size of 1-3 μm; 15% boron carbide powder with a particle size of 3 μm.

[0046] Cladding substrate pretreatment. Use 80-mesh, 120-mesh, 240-mesh, 320-mesh and 600-mesh sandpaper in sequence to polish the surface of the substrate, then ultrasonically clean it with water and ethanol for 10 minutes, and dry it for later use.

[0047] Mixing of cladding materials. Boron carbide powder (mass fraction 15%, particle size 3 μm) and pure titanium powder (mass fraction 85%, particle size 1-3 μm) were mixed for 3 hours by mass ratio through a planetary ball mill at a speed of 200 rpm to make a uniform Mix powder.

[0048] Laser cladding. Mix the mixed powder into a suspension state with a polyvinyl alcohol aqueous solution, the ratio of the mixed powder to the polyvinyl alcohol aqueous solution = 0.34g: 1.5g, apply it on the polished substrate, and dry to ob...

Embodiment 2

[0051] The mass percentage of the cladding material used in the wear-resistant coating is: 60% pure titanium powder with a particle size of 1-3 μm; 40% boron carbide powder with a particle size of 500nm.

[0052] Cladding substrate pretreatment. Use 80-mesh, 120-mesh, 240-mesh, 320-mesh and 600-mesh sandpaper in sequence to polish the surface of the substrate, then ultrasonically clean it with water and ethanol for 10 minutes, and dry it for later use.

[0053] Mixing of cladding materials. Boron carbide powder (mass fraction 40%, particle size 500nm) and pure titanium powder (mass fraction 60%, particle size 1-3μm) were mixed for 3 hours by mass ratio through a planetary ball mill at a speed of 200rpm to make a uniform Mix powder.

[0054] Laser cladding. The mixed powder is mixed into a suspension state by polyvinyl alcohol aqueous solution, the ratio of mixed powder to polyvinyl alcohol aqueous solution=0.4g:2g, coated on the polished substrate, dried to obtain a preset ...

Embodiment 3

[0057] The mass percentage of the cladding material used in the wear-resistant coating is: 70% pure titanium powder with a particle size of 1-3 μm; 30% boron carbide powder with a particle size of 3 μm.

[0058] Cladding substrate pretreatment. Use 80-mesh, 120-mesh, 240-mesh, 320-mesh and 600-mesh sandpaper in sequence to polish the surface of the substrate, then ultrasonically clean it with water and ethanol for 10 minutes, and dry it for later use.

[0059] Mixing of cladding materials. Boron carbide powder (mass fraction 30%, particle size 3 μm) and pure titanium powder (mass fraction 70%, particle size 1-3 μm) were mixed by mass ratio for 3 hours through a planetary ball mill at a speed of 200 rpm to make a uniform Mix powder.

[0060] Laser cladding. The mixed powder is mixed into a suspension state by polyvinyl alcohol aqueous solution, the ratio of mixed powder to polyvinyl alcohol aqueous solution=0.3g:1g, coated on the ground substrate, dried to obtain a preset co...

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Abstract

The invention belongs to the technical field of material surface reinforcing and particularly relates to a method for preparing a TiC / TiB wear-resisting coating in an in-situ manner through laser cladding. According to the method, mixed powder is used as a raw material, the raw material is manufactured into slurry and then coats on a substrate, drying is carried out, and then the TiC / TiB wear-resisting coating is generated on the substrate in an in-situ manner through laser cladding. The mixed powder comprises the following components including, by mass percentage, 10%-40% of boron carbide powder and 60%-90% of pure titanium powder. The obtained coating is compact in texture, reinforced phase distribution is compact, and the coating shows good metallurgical bonding with a base material. The micro-hardness value can reach about 900-1100 HV0.2, and the wear-resisting performance is improved remarkably.

Description

technical field [0001] The invention belongs to the technical field of material surface strengthening, and in particular relates to a method for preparing TiC / TiB wear-resistant coating in situ by laser cladding. Background technique [0002] Titanium alloy has the characteristics of high specific strength, low elastic modulus, excellent corrosion resistance and good biocompatibility, and is widely used in aerospace, petrochemical, biomedical engineering and other fields. However, titanium alloy has low hardness, low plastic shear resistance, large friction coefficient and poor friction and wear performance, which limit its application. [0003] In order to ensure the excellent mechanical properties of titanium alloys while improving wear resistance, some surface modification methods, such as micro-arc oxidation, plasma spraying, physical vapor deposition, etc., can be used to treat the surface of titanium alloys. However, the wear-resistant coatings obtained by these metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10
CPCC23C24/10
Inventor 刘德福李文鹏陈涛
Owner CENT SOUTH UNIV
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