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Tungsten carbide gradient composite coating and preparation method thereof

A technology of tungsten carbide coating and composite coating, which is applied in the direction of coating, metal material coating process, superimposed layer plating, etc., which can solve the problems of easy cracking of cladding coating, thin reaction layer thickness, type and content Strict control is required to achieve the effect of easy control of the thickness of the reaction layer, simple composition and improved mechanical properties

Inactive Publication Date: 2018-12-18
XIAN UNVERSITY OF ARTS & SCI
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  • Summary
  • Abstract
  • Description
  • 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 coating and the substrate, and the large performance difference between the alloy powder and the substrate material, the cladding coating The layer is prone to defects such as cracks and pores, so the types and contents of various alloying elements in the cladding alloy powder need to be strictly controlled; (2) The thickness of the reaction layer is relatively thin, which cannot well meet the requirements of use; (3) Due to the overall reaction Complete in an instant, the thickness of the reaction layer cannot be controlled

Method used

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  • Tungsten carbide gradient composite coating and preparation method thereof
  • Tungsten carbide gradient composite coating and preparation method thereof

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preparation example Construction

[0035] The preparation method of tungsten carbide composite coating of the present invention comprises the steps:

[0036] 1) After pickling the surface of the metal substrate sequentially, select 1000 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 carburizer with a thickness of 0.2-1.2mm on the surface of the metal substrate after rust removal and cleaning, adjust the carburizer to a fine paste with alcohol or acetone, and then coat it on low-carbon steel or low-carbon alloy Steel surface; Carburizer chooses any one of HYCPC-01, HYCPC-02 or HYCPC-03.

[0038] 3) co...

Embodiment 1

[0052] 1) First carry out surface derusting (pickling) on ​​the 20 steel to be surface strengthened. The first step of pickling is to use 60ml / L phosphoric acid, and then rinse with running water; the second step is to pickle with 200ml / L sulfuric acid. Rinse with running water; the third step is to polish the surface, using 1000 mesh Al 2 o 3 sandpaper, and finally ultrasonically cleaned with alcohol;

[0053] 2) Then apply a layer of carburizing agent HYCPC-01 with a thickness of 0.2mm on the surface of 20 steel, and adjust it to a thin paste with alcohol;

[0054] 3) coating a layer of thermal insulation coating with a thickness of 2mm on it; the composition of the thermal insulation coating is mass ratio: 10% sodium silicate nonahydrate, 30% deionized water, nano-SiO 2 4%, hollow ceramic microspheres 25%, aluminum silicate fibers 9%, SiO 2 Airgel slurry 21%, potassium hexatitanate whisker 0.2%, rutile TiO 2 0.3%, titanium sol 0.5%;

[0055] 4) Put the 20 steel coated...

Embodiment 2

[0064] 1) First carry out surface derusting (pickling) on ​​the 15Cr to be surface strengthened. In the first step of pickling, choose 60ml / L phosphoric acid, and then rinse with running water; in the second step of pickling, choose 200ml / L sulfuric acid, and then Rinse with running water; the third step is surface grinding, using 1000 mesh Al 2 o 3 sandpaper, and finally ultrasonically cleaned with alcohol;

[0065] 2) Then apply a layer of carburizer HYCPC-01 with a thickness of 0.6mm on the surface of 15Cr, and adjust it to a thin paste with alcohol;

[0066] 3) coating a layer of thermal insulation coating with a thickness of 3mm on it; the composition of the thermal insulation coating is mass ratio: 10% sodium silicate nonahydrate, 37% deionized water, nano-SiO 2 3%, hollow ceramic microspheres 22%, aluminum silicate fibers 8%, SiO 2 Airgel slurry 8%, potassium hexatitanate whisker 2%, rutile TiO 2 2%, titanium sol 8%;

[0067] 4) Put the 15Cr coated with the thermal...

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Abstract

The invention discloses a tungsten carbide gradient composite coating and a preparation method thereof. The method comprises the steps: surface treatment is performed on a metal substrate; a carburantis prepared; the surface is coated with the carburant and a thermal insulation coating; surface layer recarburization is performed; a ferrotungsten powder is fed to the surface of the metal substrate; pre-drying laser scanning is performed; multi-pass lap welding is performed; heat preservation is performed; and cooling with the furnace is performed to obtain a composite wear-resistant tungsten carbide coating on the surface of the metal substrate. The coating is a tungsten carbide dense ceramic layer that can be applied to the surface of a low carbon steel or low carbon alloy steel substrate. A composite of the low carbon steel or low carbon alloy steel substrate and the ferrotungsten powder obtained by laser cladding is subjected to heating and heat preservation, thereby forming a carbide coating on the surface of the low carbon steel or low carbon alloy steel substrate; the coating and the substrate are subjected to metallurgical bonding; and the bonding force is large, greatly improving the wear resistance of the surface of low carbon steel or low carbon alloy steel substrate.

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. Tungsten is a strong carbide-forming element. Metal tungsten reacts with carbon in situ to generate different types of carbonization. WC has a high melting point (2870°C), high hardness (microhardness of 17800MPa) and good stability. At the same time, carbonization Tungsten particles are completely wetted by molten steel (wetting angle is zero), which is more readily...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10C23C8/66C23C28/00
CPCC23C8/66C23C24/106C23C28/341
Inventor 叶芳霞
Owner XIAN UNVERSITY OF ARTS & SCI
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