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Vanadium carbide gradient composite coating and preparation method thereof

A composite coating and vanadium carbide technology, which is applied in the coating, metal material coating process, etc., can solve the problems of thin reaction layer, strict control of type and content, and cracks in the cladding coating. The effect of simplicity, improved mechanical properties, and easy control of the thickness of the reaction layer

Active Publication Date: 2018-12-21
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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  • Vanadium carbide gradient composite coating and preparation method thereof
  • Vanadium carbide gradient composite coating and preparation method thereof

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preparation example Construction

[0036] Such as figure 1 Shown, the preparation method of vanadium carbide gradient composite coating of the present invention comprises the steps:

[0037] 1) After pickling the surface of the metal substrate sequentially, select 800 mesh Al 2 o 3 Sanding, rust removal with sandpaper, and then ultrasonic cleaning with alcohol or acetone; 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.

[0038] 2) Coat a layer of carburizer with a thickness of 0.2-1.0mm on the surface of the metal substrate after derusting 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: graphite powder is used as recarburizer, the partic...

Embodiment 1

[0052] 1) First, carry out surface derusting (pickling) on ​​the surface of 15 steel 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 Acid, then rinse with running water; the third step is surface grinding, using 600 mesh Al 2 o 3 sandpaper, and finally ultrasonically cleaned with alcohol;

[0053] 2) Coating a layer of graphite powder with a particle size of 600 mesh and a purity of 85% on the surface of 15 steel, and adjusting it to a thin paste with alcohol;

[0054] 3) Apply the recarburizing agent on the surface of 15 steel with a thickness of 0.5mm; and then coat a layer of insulation layer on it, wherein the thickness of the insulation coating is 1mm; the composition of the insulation coating is: nonahydrate silicic acid Sodium 10%, Deionized Water 40%, Nano SiO 2 2%, hollow ceramic microspheres 25%, aluminum silicate fibers 3...

Embodiment 2

[0063] 1) First, carry out surface derusting (pickling) on ​​the 20CrMn 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 600 mesh Al 2 o 3 sandpaper, and finally ultrasonically cleaned with alcohol;

[0064] 2) then coating a layer of graphite powder with a particle size of 700 mesh and a purity of 90% on the surface of 20CrMn, and adjusting it to a thin paste with acetone;

[0065] 3) Apply a layer of thermal insulation coating on it again, the thickness of the carburizing layer is 0.8mm; wherein, the thickness of the thermal insulation coating is 1.5mm;

[0066] Its thermal insulation coating composition is: sodium silicate nine hydrate 10%, deionized water 30%, nano-SiO 2 4%, hollow ceramic microspheres 20%, aluminum silicate fibers 9%, SiO 2 Airgel s...

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Abstract

The invention discloses a vanadium carbide gradient composite coating and a preparation method thereof. The metal matrix surface is treated, a carburant is prepared, the metal matrix surface is coatedwith the carburant and a thermal insulation coating, surface carburization is carried out, ferrovanadium powder is sent to the metal matrix surface, pre-drying laser scanning is carried out, multi-channel overlap cladding is carried out, heat preservation is carried out, while-furnace cooling is carried out, and the composite wear resistant vanadium carbide coating on the metal matrix surface isobtained. The coating includes a composite zone of granular-shaped and short rod-shaped carbide and a matrix, and can further includes a composite zone of granular-shaped and chrysanthemum-shaped carbide and the matrix, a composite zone of granular-shaped secondary carbide and the matrix, and a ferrite zone with less carbon and vanadium contents, the composite zone of the granular-shaped and shortrod-shaped carbide and the matrix, the composite zone of the granular-shaped and chrysanthemum-shaped carbide and the matrix, the composite zone of the granular-shaped secondary carbide and the matrix and the ferrite zone with the less carbon and vanadium contents are successively distributed in gradient, and can be applied to the metal matrix surface. According to the vanadium carbide gradient composite coating and the preparation method thereof, a complex of a metal matrix and vanadium is obtained by casting, external carbon sources are externally introduced, heating and heat preservation are carried out, and a carbide coating is formed on the metal matrix surface; and the coating is metallurgical bonded to the matrix, the binding force is high, and the wear resistant property of the metal matrix surface 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. Among them, vanadium carbide has a high melting point and high hardness, and its compatibility with iron is good, so it is an ideal wear-resistant coating component. There are many kinds of carbides of vanadium, the common ones are V 8 C 7 , V 2 C, VC, etc., the existing coatings or composite materials are all V 8 C 7 Or VC is the main wear-resistant phase compo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/74C23C24/10
CPCC21D1/74C23C24/103
Inventor 叶芳霞
Owner XIAN UNVERSITY OF ARTS & SCI
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