Nickel-based alloy surface wear-resistant coating and preparation method thereof

A nickel-based alloy, wear-resistant coating technology, applied in metal material coating process, coating, hot dip plating process and other directions, can solve the problems of increasing the replacement frequency of parts, friction and wear of nickel-based alloys, and easy failure, etc. To achieve the effect of increasing the mechanical bonding strength, enhancing the interface bonding strength, and enhancing the wetting effect

Active Publication Date: 2022-04-12
HUAIYIN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Under the condition of reciprocating transmission, nickel-based alloys are prone to friction and wear, and it is difficult to form a film and it is very easy to fail.
Therefore, insufficient wear resistance makes it difficult to meet the requirements of the abrasive working environment, and increases the frequency of replacement of parts
At present, the wear resistance of nickel-based alloys is mainly enhanced by ceramic phases and surface modification methods: first, wear-resistant phases represented by graphite and ceramic phases are added to the nickel-based alloy matrix, and the powder metallurgy process is used to improve the wear resistance of nickel-based alloys. Forming nickel-based composite materials, but the bonding strength between the above-mentioned reinforcement phase and the nickel-base alloy interface is weak, and at the same time, it is difficult to control the distribution of the reinforcement phase in the nickel-base alloy, and it is difficult to effectively improve the wear resistance of the nickel-base alloy
On the other hand, surface modification technology provides a way to improve the wear resistance of nickel-based alloys. For example, surface chemical heat treatments such as nitriding, carburizing, and boronizing can improve the surface hardness and wear resistance of metal materials, but penetration The layer is thin, it is difficult to meet the long-term wear requirements, which limits the wide application of nickel-based alloys

Method used

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  • Nickel-based alloy surface wear-resistant coating and preparation method thereof
  • Nickel-based alloy surface wear-resistant coating and preparation method thereof
  • Nickel-based alloy surface wear-resistant coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) The Ni-Cr nickel-based alloy is polished to a mirror surface with sandpaper and diamond abrasive paste, and then corroded in a dilute hydrofluoric acid solution for 3s to obtain a rough surface;

[0028] (2) Pure aluminum with a purity of 99.5% is heated to 690°C in a vacuum furnace, and an inert argon-assisted hot-dip aluminum process is used to pour argon into the vacuum furnace until the pressure in the furnace reaches 0.1MPa. The surface of the Ni-Cr nickel-based alloy with the rough surface is immersed in pure aluminum liquid for 10 minutes to prepare an aluminum-impregnated layer with a thickness of 500 μm. A NiAl diffusion layer is formed between the base alloys;

[0029] (3) Configure 6g / L Na 2 WO 4 , 10g / L Na 2 S, 7g / L Na 3 PO 4 , 1g / L NaOH mixed aqueous solution;

[0030] (4) Use a forward current density of 2A / cm in the time range of 0-50s 3 , The reverse current density is 1.5A / cm 3 ; After 50s, use a forward current density of 3A / cm 3 , the rev...

Embodiment 2

[0033] The difference between this example and example 1 is: in step (2), pure aluminum with a purity of 99.5% is heated to 720°C in a vacuum furnace, and argon gas is injected into the vacuum furnace until the pressure in the furnace reaches 0.15MPa, and the preparation The thickness of the hot-dipped aluminum layer was 800 μm, the annealing temperature was set to 350°C, and the rest were the same as in Example 1.

[0034] From figure 2 Al can be found in 2 o 3 WS dispersed in the ceramic coating 2 Phase particles, and Al 2 o 3 Ceramic coatings are distributed with tiny pores.

Embodiment 3

[0036] The difference between this embodiment and embodiment 2 is: the nickel base alloy is Ni-Cr-Mo in the step (1); the Na in the step (3) 2 WO 4 The concentration is 8g / L, Na 2 The S concentration is 16g / L; in step 4, the forward current density is 3A / cm in the time range of 0-50s 3 , the reverse current density is 2A / cm 3 ; After 50s, use a forward current density of 4A / cm 3 ; All the other are identical with embodiment 2.

[0037] The plateau value of the friction coefficient of the wear-resistant coating on the nickel-based alloy surface prepared in Example 3 at room temperature is about 0.21, which is lower than that of MoS prepared by powder sintering 2 The optimum friction coefficient (about 0.36) of reinforced NiCr alloy is also lower than that of single Al obtained by micro-arc oxidation 2 o 3 The coefficient of friction of the coating (0.3-0.4).

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Abstract

The invention discloses a nickel-based alloy surface wear-resistant coating and a preparation method thereof, the wear-resistant coating comprises a nickel-based alloy matrix, a wear-resistant coating composed of an Al2O3 ceramic layer and WS2 particles with a lubricating function grows on the surface of the nickel-based alloy matrix in situ, and the WS2 particles are dispersed in the Al2O3 ceramic layer. The method comprises the following steps: polishing the surface of a nickel-based alloy, corroding the nickel-based alloy with acid liquor, immersing the nickel-based alloy into molten aluminum to form an aluminum-immersed layer, and annealing the nickel-based alloy in argon to form a NiAl diffusion layer; and then constant-current micro-arc oxidation treatment with sectional forward / reverse current cooperative control is carried out in a phosphate aqueous solution containing Na2WO4 and Na2S, and the wear-resistant coating compositely reinforced by the wear-resistant ceramic Al2O3 and the WS2 with the lubricating function is formed on the surface in situ. The nickel-based alloy is promoted to form a layered friction layer in the friction process through the dual effects of the NiAl diffusion layer and the sectional type forward / reverse current cooperative control constant-current micro-arc oxidation process, the friction coefficient of the nickel-based alloy is effectively reduced, and the wear resistance is improved through the strengthening effect of the ceramic phase.

Description

technical field [0001] The invention belongs to a nickel-based alloy surface coating and its preparation, in particular to a nickel-based alloy surface wear-resistant coating and a preparation method thereof. Background technique [0002] Because of its good mechanical properties and corrosion resistance, nickel-based alloys are widely used in equipment manufacturing materials in the chemical energy industry, nuclear energy industry, transportation and other fields, such as engine turbine parts, continuous casting machine rolls, extrusion dies, etc. . Under the condition of reciprocating transmission, the nickel-based alloy is prone to friction and wear, and it is difficult to form a film and is very prone to failure. Therefore, insufficient wear resistance makes it difficult to meet the requirements of the abrasive working environment, and increases the frequency of parts replacement. At present, the wear resistance of nickel-based alloys is mainly enhanced by ceramic pha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/12C23C2/02C23C2/26C22F1/02C22F1/04C25D11/06
Inventor 夏木建林岳宾李年莲刘爱辉王华玲朱雨富周广宏
Owner HUAIYIN INSTITUTE OF TECHNOLOGY
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