Niobium carbide gradient composite coating layer and preparation method thereof

A technology of composite coating and niobium carbide, which is applied in the direction of coating, metal material coating process, superimposed layer plating, etc., can solve the problem that the type and content need to be strictly controlled, the thickness of the reaction layer is thin, and the cladding layer is prone to cracks , porosity and other problems, to achieve the effect of improving mechanical properties, simple composition, and easy control of the thickness of the reaction layer

Active Publication Date: 2019-01-22
XIAN UNVERSITY OF ARTS & SCI
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, in the cladding process, there are still the following problems that need to be solved urgently: (1) Due to the large temperature gradient between the cladding layer and the substrate, and the large performance difference between the alloy powder and the substrate material, the cladding layer is easy to Defects such as cracks and pores are generated, so the types and contents of various alloy elements in the cladding alloy powder need to be strictly controlled; (2) The thickness of the reaction layer is thin, which cannot meet the requirements of use; (3) Since the entire reaction is completed in an instant , the thickness of the reaction layer cannot be controlled

Method used

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  • Niobium carbide gradient composite coating layer and preparation method thereof
  • Niobium carbide gradient composite coating layer and preparation method thereof

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preparation example Construction

[0035] Such as figure 1 Shown, the preparation method of the niobium carbide gradient composite coating of the present invention comprises the steps:

[0036] 1) After pickling the surface of the metal substrate, select 800 mesh Al 2 o 3 Sanding, rust removal with sandpaper, and then ultrasonic cleaning with alcohol or acetone; the metal substrate is low carbon steel 15 or 20 or low carbon alloy steel 15Cr, 20Cr, 20Mn2, 20MnV, 20CrMn, 20CrMnTi, 20MnTiB, 20MnVB, 18Cr2Ni4WA, 20Cr2Ni4 or 12Cr2Ni4 ; The metal matrix structure is one or more of pearlite, martensite, ferrite, bainite, austenite and sorbite according to the different heat treatment methods.

[0037] 2) Coat a layer of recarburizer with a thickness of 0.8-2.0mm on the surface of the metal substrate after derusting and cleaning, adjust the recarburizer to a fine paste with alcohol or acetone, and then apply it on low-carbon steel or low-carbon alloy Steel surface; Carburizer chooses any one of HYCPC-01, HYCPC-02 or ...

Embodiment 1

[0051] 1) First carry out surface derusting (pickling) on ​​the 20Cr to be surface strengthened. The first step of pickling is to use 300ml / L hydrochloric acid, and then rinse with running water; the second step is to use 300ml / L hydrofluoric acid for pickling , and then washed with running water; the third step is surface grinding, using 800 mesh Al 2 o 3 sandpaper, and finally ultrasonically cleaned with alcohol;

[0052] 2) Then apply a layer of HYCPC-01 carburizer with a thickness of 0.8mm on the surface of 20Cr, and adjust it to a thin paste with alcohol;

[0053] 3) coating a layer of insulation coating with a thickness of 1mm on it; the composition of the insulation coating is 10% sodium silicate nonahydrate, 40% deionized water, nano-SiO 2 2%, hollow ceramic microspheres 25%, aluminum silicate fibers 3%, SiO 2 Airgel slurry 8%, potassium hexatitanate whisker 2%, rutile TiO 2 2%, titanium sol 8%;

[0054] 4) Put the 20Cr coated with the thermal insulation coating i...

Embodiment 2

[0064] 1) First carry out surface derusting (pickling) on ​​the 20Mn2 to be surface strengthened. The first step of pickling is to use 300ml / L hydrochloric acid, and then rinse with running water; the second step is to pickle with 300ml / L hydrofluoric acid , and then washed with running water; the third step is surface grinding, using 800 mesh Al 2 o 3 sandpaper, and finally ultrasonically cleaned with alcohol;

[0065] 2) Then apply a layer of carburant HYCPC-01 with a thickness of 1mm on the surface of 20Mn2, and adjust it to a thin paste with alcohol;

[0066] 3) coating a layer of insulation coating with a thickness of 1.2mm on it; the composition of the insulation coating is 10% sodium silicate nonahydrate, 30% deionized water, nano-SiO 2 4%, hollow ceramic microspheres 20%, aluminum silicate fibers 3%, SiO 2 Airgel slurry 28%, potassium hexatitanate whisker 1%, rutile TiO 2 1%, titanium sol 3%;

[0067] 4) Put the 20Mn2 coated with thermal insulation coating in step...

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Abstract

The invention discloses a niobium carbide gradient composite coating layer and a preparation method thereof. The preparation method comprises the following steps: surface treatment of a metal substrate, preparation of a carburant, coating of the surface with the carburant and a thermal insulation coating layer, surface layer carburetting, conveying niobium-iron powder to the surface of the metal substrate, pre-drying, laser scanning, multi-track-joined cladding, thermal insulation, and furnace cooling for obtaining the composite wear-resistant niobium carbide coating layer on the surface of the metal substrate. The coating layer comprises a dense micro-nano and micro-NbC layer and a uniformly-distributed near-spherical and cuboidal NbC particle dispersion layer, and the uniformly-distributed near-spherical and cuboidal NbC particle dispersion layer is sequentially arranged in a gradient. The coating layer can be applied to the surface of the metal substrate. The carbide coating layer is formed on the surface of the metal substrate through introduction of an external carbon source to a metal substrate and vanadium complex, obtained through laser cladding, heating and thermal insulation, the coating layer and the substrate are metallurgically bonded, and the bonding force is very strong, so the wear resistance of the surface of the metal substrate is greatly improved.

Description

technical field [0001] The invention relates to a wear-resistant coating and a preparation method thereof, in particular to a composite wear-resistant carbide coating and a preparation method thereof, in particular to a composite wear-resistant carbide applied to the surface of low-carbon steel or low-carbon alloy steel Coatings and their preparation methods. Background technique [0002] Carbide has the characteristics of high hardness and excellent wear resistance. Covering the surface of the metal alloy substrate by coating can improve the wear resistance and life of the parts made of the substrate material. Niobium is a strong carbide forming element. The in-situ reaction between metal niobium and carbon can generate different kinds of niobium carbides. The Nb element dissolved in austenite combines with the C element in the matrix to form the second phase reinforcement of niobium carbide. The particles are evenly distributed in the austenite grain or grain boundary, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10C23C8/66C23C28/00
CPCC23C8/66C23C24/10C23C28/341C23C28/36
Inventor 叶芳霞李苗苗
Owner XIAN UNVERSITY OF ARTS & SCI
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