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Preparation method of nickel-chromium chromium carbide wear-resistant coating

A wear-resistant coating and chromium carbide technology, which is applied in the coating, metal material coating process, fusion spraying, etc., can solve the problems of inapplicability in the production of large batches or large parts, inconvenient operation of equipment, and cracks in the coating. , to achieve the effects of ease of automation, energy concentration, and reduction of internal defects

Inactive Publication Date: 2019-08-02
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the cost of laser remelting equipment is high, and the operation of the equipment is inconvenient, so it is not suitable for the production of large batches or large parts
And the energy of the laser is too high, the difference between the workpiece and the room temperature after remelting is too large, and the molten coating during the cooling process is prone to cracks due to too much supercooling

Method used

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  • Preparation method of nickel-chromium chromium carbide wear-resistant coating
  • Preparation method of nickel-chromium chromium carbide wear-resistant coating
  • Preparation method of nickel-chromium chromium carbide wear-resistant coating

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preparation example Construction

[0034] A kind of preparation method of nickel-chromium carbide wear-resistant coating of the present invention comprises the following steps:

[0035] In the first step, the NiCr and Cr 3 C 2The powder is mixed evenly according to the ratio, and the powder particle size is 25-30 μm. After sintering, the nickel-chromium chromium carbide powder is obtained. The sintering temperature is 1400 degrees Celsius.

[0036] The second step is to prepare nickel-chromium chromium carbide (NiCr-Cr 3 C 2 ) remelted coating:

[0037] 1) Sand blasting pretreatment of the surface of the substrate;

[0038] 2) Plasma spraying the sandblasted substrate;

[0039] 3) Preheat the coating sample after plasma spraying before remelting, then use tungsten argon arc welding machine (YC-300WX welding machine) for TIG remelting treatment, and then perform heat preservation after remelting, Finally, a nickel-chromium carbide wear-resistant remelting coating is obtained; argon is used as a protective ...

Embodiment 1

[0047] This embodiment adopts nickel chromium carbide (NiCr-Cr 3 C 2 ) powder is proportioned according to the mass distribution ratio of 3:7. 30% NiCr and 70% Cr 3 C 2 The powders were mixed in a ball mill mixer for 24 hours, dispersed and bonded in a mixing tank after mixing, and then spray-dried. 30% NiCr-Cr after drying 3 C 2 The powder particles were sintered at 1400°C for 2 hours in an atmosphere protection furnace, taken out and crushed, and sieved with a 500-mesh standard sieve. Get 25-30μm nickel-chromium chromium carbide (30%NiCr-Cr 3 C 2 )powder.

[0048] Nickel-chromium carbide (NiCr-Cr 3 C 2 ) The main steps of coating preparation include: Spraying corundum sand on the substrate 45 steel so that the surface roughness (Ra) of the substrate is 3.2-6.4μm → feeding in the arcing ion gas → power supply to the spraying equipment → arcing of the plasma spray gun → arcing to the The spray powder is sent into the plasma stream to spray the surface of the workpie...

Embodiment 2

[0061] This embodiment also adopts nickel-chromium carbide (NiCr-Cr 3 C 2 ) powder with a particle size of 25-30 μm. Relative to embodiment 1, change powder NiCr and Cr 3 C 2 The composition ratio of NiCr is adjusted from 30% to 25%, while Cr 3 C 2 The proportion is adjusted from 70% to 75%.

[0062] The other steps are the same as in Example 1, and the resulting coating has more internal cracks. The metallographic images of the coating section of embodiment 1 and embodiment 2 are as follows: Figure 10 As shown in (a) and (b), the increase in cracks in Example 2 is due to the high content of ceramics, which makes the coating easy to crack, but the overall is still metallurgical bonding.

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Abstract

The invention provides a preparation method of a nickel-chromium chromium carbide wear-resistant coating. The preparation method includes the following steps that 1, powder of NiCr and Cr3C2 is mixedto be uniform in proportion, and after the mixture is sintered, nickel-chromium chromium carbide powder is obtained; and 2, a nickel-chromium chromium carbide (NiCr-Cr3C2) remelted coating is prepared, wherein 1), the surface of a matrix is subjected to sand blasting pretreatment; 2), the matrix obtained after sand blasting treatment is subjected to plasma spraying; 3), a coating sample obtained after plasma spraying is subjected to preheating treatment before remelting, then a tungsten electrode argon arc welding machine is adopted for TIG remelting treatment, then heat insulation treatment after remelting is carried out, and finally the nickel-chromium chromium carbide wear-resistant remelted coating is obtained; argon is adopted as shielding gas in the TIG remelting process, wherein theTIG remelting current is 85-100 A, the argon arc length is 2 mm, the argon flow is 10 L / min, the remelting speed is 200 mm / min, and the step length is 1.5 mm. The preheating temperature and the heatinsulation temperature are both 300 DEG C, and the time is 2 hours. By means of the method, mechanical bonding between the coating and the matrix is converted into metallurgical bonding, and the mechanical performance and the wear-resistant performance of the coating are improved.

Description

technical field [0001] The invention relates to the technical field of wear-resistant coatings, in particular to a nickel-chromium carbide (NiCr-Cr 3 C 2 ) Preparation method of wear-resistant coating. Background technique [0002] Wear, corrosion and fracture are the three main failure modes of mechanical engineering parts. Among them, the cases of workpiece failure due to material wear are the most, and the annual economic loss related to wear accounts for about 2% to 7% of my country's GDP, and the fields involved include metallurgy, mining, chemical industry, building materials, and aerospace. As we all know, the wear and corrosion of materials mostly occur on the surface of the workpiece. Under most working conditions, the two show a mutual promotion relationship, and this synergistic relationship will aggravate the failure of the material. In practical engineering applications, people usually use reasonable surface protection measures to improve the wear resistance ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/06C23C4/18
CPCC23C4/06C23C4/134C23C4/18
Inventor 李国禄袁静敏石佳东董天顺付彬国刘金海
Owner HEBEI UNIV OF TECH
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