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Composite coating on steel surface with hole array and preparation method thereof

A technology of surface compounding and hole array, applied in the direction of coating, metal material coating process, etc., can solve the problems of high wear amount, large friction coefficient, small hardness of coating structure, etc. The effect of layer structure optimization

Active Publication Date: 2020-10-16
SHAANXI SCI TECH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In the traditional steel coating preparation process, a single alloy coating or ceramic coating is used as a functional modification coating to improve the wear resistance of steel, but the prepared coating structure has low hardness, high friction coefficient and high wear.

Method used

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  • Composite coating on steel surface with hole array and preparation method thereof

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preparation example Construction

[0029] The invention provides a method for preparing a composite coating on a hole array steel surface, comprising the following steps:

[0030] Process the steel surface to obtain surface steel holes distributed in parallel arrangement of dot matrix;

[0031] Ti powder, Cr powder, Al powder and Cr 3 C 2 After the powders are mixed, sintered to obtain (Ti x ,Cr 1-x ) 3 AlC 2 Solid solution composite powder;

[0032] The (Ti x ,Cr 1-x ) 3 AlC 2 The solid solution composite powder was etched with corrosive solution to obtain (Ti x ,Cr 1-x ) 3 C 2 Powder;

[0033] After mixing Ti powder and Si powder, sintering to obtain Ti-Si pre-alloyed powder;

[0034] will Ni 9 Cr 5 Al 5 Mo powder, (Ti x ,Cr 1-x ) 3 C 2 Powder, Ni powder wrapped MoS 2 The powder is mixed with the Ti-Si pre-alloyed powder and the B powder to obtain a mixed powder;

[0035] The mixed powder is pre-placed on the surface steel hole with an adhesive, followed by laser cladding and heat trea...

Embodiment 1

[0074] according to figure 1 As shown, the surface of Q235 low carbon steel is wire-cut into a sample with a size of 80mm×80mm×10mm, and then the surface steel holes with round holes arranged in parallel arrangement of dot matrix are processed. The diameter of round holes is 1.5mm, the depth is 0.9mm, The center distance of the round hole is 6mm, the surface is polished to remove the surface oxide film, and cleaned with ethanol;

[0075] By atomic ratio (Ti 0.65 ,Cr 0.35 ) 3 AlC 2 Calculate and weigh Ti powder, Cr powder, Al powder, Cr 3 C 2 Powder, mixed by dry ball milling for 2 hours, the ball milling equipment is a planetary ball mill, the spindle speed of the ball mill is 350r / min, the filling factor is 0.4, the ball grinding material is agate balls, the ball milling tank is a nylon ball milling tank, protected by argon, and then the balls are ground The powder was put into a graphite crucible covered with graphite paper, and sintered in a vacuum furnace at 1380 °C ...

Embodiment 2

[0083] according to figure 1 As shown, the surface of Q235 low-carbon steel was wire-cut into a sample with a size of 80mm×80mm×10mm, and then the surface steel holes with round holes arranged in parallel in lattice were processed. The diameter of the round holes was 1.0mm, the depth was 0.7mm, The center distance of the round hole is 5mm, the surface is polished to remove the surface oxide film, and cleaned with ethanol;

[0084] By atomic ratio (Ti 0.5 ,Cr 0.5 ) 3 AlC 2 Calculate and weigh Ti powder, Cr powder, Al powder, Cr 3 C 2 Powder, mixed by dry ball milling for 0.5h, the ball milling equipment is a planetary ball mill, the spindle speed of the ball mill is 4500r / min, the filling factor is 0.4, the ball milling material is agate balls, the ball milling pot is a nylon ball milling pot, protected by argon, and then the balls are ground The powder was put into a graphite crucible covered with graphite paper, and sintered in a vacuum furnace at 1350°C for 3 hours to ...

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Abstract

The invention provides a hole array steel surface composite coating and a preparation method thereof, and belongs to the technical field of metal surface engineering and high temperature coating preparation. By means of the hole array steel surface composite coating, two-dimensional carbide and sulfide which have good friction performance are double lubricating phases, the two-dimensional carbideis subjected to solid solution modification, the sulfide is subjected to encapsulation modification, and Fe-Ni, Ti-Ni, Ti-Si Fe-Si and TiB2 are used as combined reinforcing phases. Through the synergistic effect between functional unit phases, the self-lubricating wear resistance of steel is improved, the microhardness of the coating is improved, and the friction coefficient and the wear amount are reduced. Data of the embodiment show that the microhardness HV0.2 of the hole array steel surface composite coating prepared through the method is 850.6-894.7, and the friction coefficient is 0.3562-0.4277.

Description

technical field [0001] The invention relates to the technical field of metal surface engineering and high-temperature coating preparation, in particular to a composite coating on a steel surface with hole arrays and a preparation method thereof. Background technique [0002] With the development of modern industry, the performance requirements of mechanical products are getting higher and higher in the production process. The long-term stable operation of products under high parameters (such as high temperature, high pressure, high speed, etc.) Higher requirements are put forward for strength, wear resistance and corrosion resistance. All kinds of mechanical equipment, instruments and meters, metal parts in metallurgical parts, and various tools and molds are often damaged and invalidated from the surface first during use, and a large part of the reason for the damage is caused by surface wear. Therefore, as long as the surface of the part is strengthened, the performance r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/10
Inventor 刘芳
Owner SHAANXI SCI TECH UNIV
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