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High-density titanium carbide composite wear-resisting coating and preparation method thereof

A composite coating and titanium carbide technology, which is applied in the field of composite wear-resistant carbide coating and its preparation, composite wear-resistant titanium carbide coating and its preparation, can solve the problem of thin reaction layer, strict control of type and content, Cladding coatings are prone to cracks and other problems, achieving the effect of simple composition, improved mechanical properties, and easy control of the thickness of the reaction layer

Inactive Publication Date: 2019-01-01
XIAN UNVERSITY OF ARTS & SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • High-density titanium carbide composite wear-resisting coating and preparation method thereof

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preparation example Construction

[0032] Such as figure 1 Shown, the preparation method of titanium carbide gradient composite coating of the present invention comprises the steps:

[0033] 1) After pickling the surface of the metal substrate, select 900 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.

[0034] 2) Coat a layer of recarburizer with a thickness of 0.5-1.5mm on the surface of the metal substrate after derusting and cleaning. Acetone adjusts the carburant to a fine paste.

[0035] 3) Apply a layer of thermal insulation coating with a thickness of 1.5-2.5mm on it; the thermal insulation coating is mass ratio: 10% so...

Embodiment 1

[0044] 1) First, carry out surface derusting (pickling) on ​​the surface of 20 steel to be surface strengthened. In the first step of pickling, 120ml / L hydrogen peroxide is selected, and then rinsed with running water; in the second step of pickling, 240ml / L hydrogen peroxide is selected. 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;

[0045] 2) Apply a layer of carburant HYCPC-01 with a thickness of 0.5mm on the surface of 20 steel after derusting and cleaning, and adjust it to a thin paste with alcohol;

[0046] 3) coating a layer of thermal insulation coating with a thickness of 1.5mm on it; the composition of the thermal insulation coating is 10% sodium silicate nonahydrate, 36% deionized water, nano-SiO 2 4%, hollow ceramic microspheres 25%, aluminum silicate fibers 3%, SiO 2 Airgel slurry 21%, rutile TiO 2 0.5%, titanium sol 0.5%;

[0047] 4) Put the 20 steel coa...

Embodiment 2

[0055] 1) First carry out surface derusting (pickling) on ​​the surface of 20CrMnTi to be surface strengthened. In the first step of pickling, 120ml / L hydrogen peroxide is selected, and then rinsed with running water; in the second step of pickling, 240ml / L hydrogen peroxide is selected, 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;

[0056] 2) Then apply a layer of carburizer HYCPC-02 with a thickness of 0.9mm on the surface of 20CrMnTi after derusting and cleaning, and adjust it to a thin paste with alcohol;

[0057] 3) Coating a layer of thermal insulation coating with a thickness of 2mm on it; the components of the thermal insulation coating are 10% sodium silicate nonahydrate, 30% deionized water, nano-SiO 2 2.5%, hollow ceramic microspheres 24%, aluminum silicate fibers 9%, SiO 2 Airgel slurry 16.5%, potassium hexatitanate whisker 2%, rutile TiO 2 2%, titanium...

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Abstract

The invention discloses a high-density titanium carbide composite coating and a preparation method thereof. The preparation method comprises the following steps: treating the surface of a metal matrix, preparing a recarburizing agent, smearing the recarburizing agent and a thermal insulation coating on the surface, recarburizing a surface layer, sending ferrotitanium powder onto the surface of themetal matrix, pre-drying, laser scanning, performing multi-step laser overlapping cladding, preserving the heat, cooling along with the furnace, and obtaining the composite wear-resisting titanium carbide coating on the surface of the metal matrix. The coating consists of a great amount of gray reinforcing phase particles TiC and little gray white iron matrix; and the reinforcing phase particlesTiC are uniformly distributed and are uniform in shape and are in a square or spherical shape, and have no apparent sharp angle and edges and corners. The metal matrix and titanium complex obtained byvirtue of casting is provided with an outer carbon source to be heated and thermally preserved, so that a carbide coating is formed on the surface of the metal matrix, the coating is metallurgicallycombined with the matrix, the binding force is high, and the wear resistance 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 titanium carbide coating and a preparation method thereof, in particular to a composite wear-resistant carbonization 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. Titanium is a strong carbide-forming element. The in-situ reaction between metal titanium and carbon can generate different types of titanium carbide. TiC is a face-centered structure with high thermal stability and high hardness, lattice constant and lattice type It is very close to austenite, which facilitates better combination with the matrix, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10C23C8/66
CPCC23C8/66C23C24/103
Inventor 叶芳霞
Owner XIAN UNVERSITY OF ARTS & SCI
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