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Positive pressure atmosphere aluminizing reinforcing method for nickel-based alloy, nickel-based alloy workpiece and application

A nickel-based alloy and atmosphere technology, which is applied in metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of reducing aluminized quality, hindering aluminized, metal surface oxidation, etc., and achieve the quality of aluminized layer High efficiency, easy operation and low equipment cost

Inactive Publication Date: 2018-07-03
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are problems such as aluminizing agent and metal surface oxidation in aluminizing in the atmospheric environment, which hinder the progress of aluminizing and reduce the quality of aluminizing

Method used

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  • Positive pressure atmosphere aluminizing reinforcing method for nickel-based alloy, nickel-based alloy workpiece and application
  • Positive pressure atmosphere aluminizing reinforcing method for nickel-based alloy, nickel-based alloy workpiece and application
  • Positive pressure atmosphere aluminizing reinforcing method for nickel-based alloy, nickel-based alloy workpiece and application

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preparation example Construction

[0046] Preferably, the preparation method of the aluminizing agent comprises: according to the composition of the aluminizing agent, taking aluminum powder, NH 4 Cl and Al 2 o 3 Mix and ball mill, mix well and set aside. Wherein, the rotating speed of the ball mill is 100-200r / min, and the ball milling time is 5-20h.

[0047] In some preferred embodiments, the aluminizing strengthening method includes: keeping the pressure of the protective atmosphere at 0.03-0.05 MPa during the aluminizing process.

[0048] Preferably, the protective atmosphere is selected from an inert gas atmosphere, such as an Ar atmosphere.

[0049] In some preferred embodiments, the aluminized strengthening method includes:

[0050] The nickel-based alloy substrate is completely covered with aluminizing agent, and then vacuum-dried,

[0051] After that, put the nickel-based alloy substrate covered with aluminizing agent into the vacuum furnace, and then seal and vacuum the inner cavity of the vacuum f...

Embodiment 1

[0073] The Ni-Al strengthening layer on the surface of the nickel-based alloy in this example is composed of dense Ni with a thickness of 87 μm. 2 Al 3 Composed of the coating, the aluminized strengthening layer is a metallurgical bonding layer. Compared with the nickel-based alloy, the hardness is increased by 4 times, the wear resistance is increased by 1.7 times, and the corrosion resistance is increased by 1.8 times. Figure 1-Figure 6 It is the performance parameter diagram of the nickel-based alloy surface aluminized strengthening layer of this embodiment and the performance comparison diagram with the nickel-based alloy substrate.

[0074] The positive pressure atmosphere aluminizing strengthening method of the Ni-Al strengthening layer on the surface of the nickel-based alloy can be carried out according to the following steps:

[0075] (1) Ultrasonic cleaning of the nickel-based alloy substrate, preparation of the nickel-based alloy sample to be processed, with a bri...

Embodiment 2

[0083] The Ni-Al strengthening layer on the surface of the nickel-based alloy in this embodiment is composed of a dense Ni2Al3 coating with a thickness of 98 μm. The aluminized layer is a metallurgical bonding layer. Compared with the nickel-based alloy, the hardness is increased by 4.3 times, and the wear resistance is increased by 1.5. times, corrosion resistance increased by 2 times.

[0084] The positive pressure atmosphere aluminizing strengthening method of the Ni-Al strengthening layer on the surface of the nickel-based alloy is carried out according to the following steps:

[0085] (1) Ultrasonic cleaning of the nickel-based alloy substrate, preparation of the nickel-based alloy sample to be processed, with a bright surface and no oxide layer, and then ultrasonic cleaning of the sample to remove surface grease, etc. The cleaning agents are ethanol and acetone;

[0086] (2) prepare aluminizing agent, wherein the weight percent of aluminizing agent is: 20% aluminum powde...

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Abstract

The invention discloses a positive pressure atmosphere aluminizing reinforcing method for a nickel-based alloy, a nickel-based alloy workpiece and application. The aluminizing reinforcing method comprises the following steps: placing a nickel-based alloy matrix with the local surface covered with an aluminizing agent at least in protective atmosphere, aluminizing at the temperature of 900-1100 DEGC, and enabling the protective atmosphere to be at positive pressure in an aluminizing process, wherein a surface metallurgically bonded Ni-Al reinforcing layer with high hardness, high abrasion resistance and high corrosion resistance can be obtained by controlling technological conditions such as aluminizing temperature and aluminizing time. The method disclosed by the invention has the advantages that influence of oxygen and the like on an aluminizing layer is isolated, aluminizing rate and aluminizing layer quality are obviously improved, and corrosion resistance and oxidation resistanceof the aluminizing layer can be guaranteed; meanwhile, the limit of the method on shape and size of a workpiece is low, a nickel-based alloy surface reinforced layer with the characteristics of high hardness, high abrasion resistance and high corrosion resistance can be obtained, the surface protection of the nickel-based alloy is effectively realized, and the performance of the nickel-based alloymatrix is hardly damaged.

Description

technical field [0001] The invention relates to a positive pressure atmosphere aluminizing strengthening method for a nickel-based alloy, in particular to a surface chemical heat treatment strengthening technology for a positive pressure atmosphere aluminizing of a nickel-based alloy, a nickel-based alloy workpiece and its application, and belongs to the material surface protection treatment technology field. Background technique [0002] Nickel-based alloys refer to alloys that use nickel as the matrix and have certain comprehensive properties such as high-temperature strength. According to their properties, they can be divided into heat-resistant alloys, corrosion-resistant alloys, wear-resistant alloys, precision alloys, and shape memory alloys. Among various nickel-based alloys, Monel 400 alloy is a nickel-based corrosion-resistant alloy with large consumption, wide application and excellent comprehensive performance. It is used in marine heat exchangers, seawater desali...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C10/30
CPCC23C10/30
Inventor 曾志翔马付良刘二勇王刚蒲吉斌王立平
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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