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Tantalum carbide gradient composite coating layer and preparation method thereof

A technology of composite coating and tantalum carbide, which is applied in the direction of coating, metal material coating process, superimposed layer plating, etc., can solve the problems of easy cracking of cladding coating, poor laser absorption ability, thin reaction layer, etc. problem, to achieve the effect of easy control of the thickness of the reaction layer, improvement of mechanical properties, and simple composition

Active Publication Date: 2019-01-22
XIAN UNVERSITY OF ARTS & SCI
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  • 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 The size is too small, and the temperature of laser cladding is high, the powder is easy to gasify during the cladding process, and the powder itself has poor absorption ability to laser

Method used

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

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preparation example Construction

[0035] The preparation method of the composite wear-resistant tantalum carbide coating of the present invention comprises the following steps:

[0036] 1) After pickling the surface of the substrate sequentially, select 900 mesh Al 2 o 3 Sandpaper grinding, sandpaper rust removal, and then ultrasonic cleaning with alcohol or acetone; the metal substrate is 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 different heat treatment methods.

[0037] 2) Coat the surface of the low-carbon steel or low-carbon alloy steel after derusting and cleaning with a layer of carburizing agent with a thickness of 0.5-2mm. The carburizing agent is adjusted to a paste with alcohol or acetone and then coated on the surface of the substrate ; The recarburizer includes graphite powder, the graphite powder has a particle size of 600-1...

Embodiment 1

[0050] 1) First carry out surface derusting (pickling) on ​​the 15 steel to be surface strengthened. The first step is pickling, use 120ml / L hydrogen peroxide, and then rinse with running water; the second step is pickling, choose 240ml / L hydrogen peroxide, Rinse with running water; the third step is to polish the surface, using 900 mesh Al 2 o 3 sandpaper, and finally ultrasonically cleaned with alcohol;

[0051] 2) Then, apply a layer of graphite powder with a particle size of 600 mesh, a purity of 85%, and a thickness of 0.5mm on the surface of the 15 steel, and adjust it to a thin paste with alcohol;

[0052] 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 9%, SiO 2 Airgel slurry 8%, potassium hexatitanate whisker 0.5%, rutile TiO 2 0.5%, titanium sol 5%;

[0053] 4) Put the ...

Embodiment 2

[0063] 1) First, carry out surface derusting (pickling) on ​​the surface of 20MnV to be surface strengthened. In the first step of pickling, choose 120ml / L hydrogen peroxide, and then rinse with running water; in the second step of pickling, choose 240ml / L hydrogen peroxide, and then Rinse with running water; the third step is surface grinding, using 900 mesh Al 2 o 3 sandpaper, and finally ultrasonically cleaned with alcohol;

[0064] 2) Then apply a layer of graphite powder with a particle size of 750 mesh, a purity of 90%, and a thickness of 1mm on the surface of the low-carbon steel 15, and adjust it to a thin paste with alcohol;

[0065] 3) coating a layer of thermal insulation coating with a thickness of 1.5mm on it; the thermal insulation coating is mass ratio: 10% sodium silicate nonahydrate, 38% deionized water, nano-SiO 2 4%, hollow ceramic microspheres 14%, aluminum silicate fibers 6%, SiO 2 Airgel slurry 16%, potassium hexatitanate whisker 2%, rutile TiO 2 2%, ...

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Abstract

The invention discloses a tantalum 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 tantalum-iron powder to the surface of the metalsubstrate, pre-drying, laser scanning, multi-track-joined cladding, thermal insulation, and furnace cooling for obtaining the composite wear-resistant tantalum carbide coating layer on the surface ofthe metal substrate. The coating comprises a dense nano-TaC layer, a micro-nano and micro-TaC layer and a uniformly distributed TaC dispersion layer. The coating layer and the substrate are metallurgically bonded, and the bonding force is very strong, so the wear resistance of the surface of a low-carbon steel or low-carbon steel 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. Tantalum is a strong carbide-forming element, and metal tantalum reacts with carbon in situ to generate different types of tantalum carbides. Existing reports show that tantalum carbides mainly include TaC and Ta 2 C two chemical forms. Both have high melting points (TaC / Ta 2 C: 3950 / 3330℃), high density (TaC / Ta 2 C: 14.5 / 14.8g / cm 3 )specialty. In addition, TaC ...

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
Owner XIAN UNVERSITY OF ARTS & SCI
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