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Nickel-base superalloy alitizing method and product and nickel-base superalloy surface aluminum- chromium-silicon solid powder aluminizing agent

A nickel-based superalloy, surface aluminizing technology, applied in solid diffusion coating, metal material coating process, coating and other directions, can solve the problems of high aluminizing temperature, cracking, oxide layer peeling, etc., to improve the diffusion efficiency , shorten the process, the effect of cooling prevention

Active Publication Date: 2018-08-31
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process is the most widely used aluminizing method so far. However, the traditional embedding aluminizing process has problems such as long processing time, high aluminizing temperature, uneven thickness of the aluminizing layer, and easy peeling and cracking of the oxide layer. question

Method used

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  • Nickel-base superalloy alitizing method and product and nickel-base superalloy surface aluminum- chromium-silicon solid powder aluminizing agent
  • Nickel-base superalloy alitizing method and product and nickel-base superalloy surface aluminum- chromium-silicon solid powder aluminizing agent
  • Nickel-base superalloy alitizing method and product and nickel-base superalloy surface aluminum- chromium-silicon solid powder aluminizing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Preparation of aluminizing agent: according to the ratio of chromium powder (Cr) 1.5-2.5%, alumina (Al2O3) 79-80%, aluminum-silicon alloy powder 18-18.5%, weigh 300g with an electronic balance with an accuracy of 0.1mg , and then put it into a V-type mixer and stir for 6 hours; surface treatment before aluminizing: Ni-based alloys are obtained by wire cutting to obtain 20mm*20mm*3mm flake samples, which are sequentially used with 600 mesh, 800 mesh, 1000 mesh, 1500 mesh mesh, 2000-mesh water abrasive paper and then polished to a mirror surface with 0.5 diamond; then ultrasonically cleaned the Ni-based alloy with 99.99% alcohol for 10-15 minutes, and then dried in a vacuum oven at 100°C for 20 minutes; 300g aluminized The graphite mould, then loaded with the standard Ni-based alloy flakes in turn, was rapidly raised to 1000°C at a rate of 100°C / min, kept in a discharge plasma furnace for 30min, and a pulse current of 8 / 2 was used; cleaned after removal, and sprayed with c...

Embodiment 2

[0032] Preparation of aluminizing agent: 1.5-2.5% of chromium powder (Cr), 79-80% of aluminum oxide (Al2O3), 18-18.5% of aluminum-silicon alloy powder, weigh 300g with an electronic balance with an accuracy of 0.1mg, and then Put it into a V-shaped mixer and stir for 6 hours; Surface treatment before aluminizing: Ni-based alloys are cut into 20mm*20mm*3mm flake samples by wire cutting, and then used 600 mesh, 800 mesh, 1000 mesh, 1500 mesh, Grind with 2000-mesh water abrasive paper and then polish to the mirror surface with 0.5 diamond; then use 99.99% alcohol to ultrasonically clean the Ni-based alloy for 10-15 minutes, and then put it in a vacuum drying oven for 20 minutes at 100°C; mix 300g of aluminizing agent and The standard Ni-based alloy flakes are loaded into graphite molds one by one, rapidly raised to 1000°C at a speed of 100°C / min, kept in a discharge plasma furnace for 30min, and a pulse current of 12 / 2 is used; after taking it out, clean it and blast it with corun...

Embodiment 3

[0034]Preparation of aluminizing agent: 1.5-2.5% of chromium powder (Cr), 79-80% of aluminum oxide (Al2O3), 18-18.5% of aluminum-silicon alloy powder, weigh 300g with an electronic balance with an accuracy of 0.1mg, and then Put it into a V-shaped mixer and stir for 6 hours; Surface treatment before aluminizing: Ni-based alloys are cut into 20mm*20mm*3mm flake samples by wire cutting, and then used 600 mesh, 800 mesh, 1000 mesh, 1500 mesh, Grind with 2000-mesh water abrasive paper and then polish to the mirror surface with 0.5 diamond; then use 99.99% alcohol to ultrasonically clean the Ni-based alloy for 10-15 minutes, and then put it in a vacuum drying oven for 20 minutes at 100°C; mix 300g of aluminizing agent and Standard Ni-based alloy flakes are loaded into graphite molds one by one, rapidly raised to 1000°C at a speed of 100°C / min, kept in a discharge plasma furnace for 30 minutes, and a pulse current of 6 / 2 is used; cleaned after removal, and sandblasted with corundum. ...

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Abstract

The invention discloses a nickel-base superalloy alitizing method and product and a nickel-base superalloy surface aluminum-chromium-silicon solid powder aluminizing agent. The method comprises the steps that a discharge plasma sintering method is adopted, nickel-base alloy and the aluminizing agent are placed into a graphite die, the temperature is rapidly increased to 1000 DEG C, and heat insulation is carried out for 30 min in a discharge plasma furnace. The aluminizing agent is prepared from 1.5-2.5% of chromium powder, 79-80% of aluminum oxide and 18-18.5% of aluminum-silicon alloy powder. Atomic diffusion is accelerated through a temperature field, an electric field and a magnetic field of discharge plasma sintering, and an ideal aluminizing layer can be rapidly obtained. The discharge plasma sintering advantages are combined, grains are refined, a large number of grain boundaries are obtained, and the grain boundaries can achieve a reinforcing effect and also can provide a rapiddiffusion channel and improve diffusion efficiency. The product has the high temperature oxidation resistance and thermal corrosion resistance, and the thickness of an alitizing layer can be adjustedby changing the sintering temperature, heat insulation time and pulse current.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, and in particular relates to a method and product for aluminizing the surface of a nickel-based superalloy, and an aluminum-chromium-silicon solid powder aluminizing agent for the surface of a nickel-based superalloy. Background technique [0002] Nickel-based alloys are mainly used in engine blades in the aerospace field. At present, the gas inlet temperature of advanced gas turbines can reach 1600°C, and the operating temperature of the blades can reach 1000-1200°C. Therefore, the engine blade materials must have excellent high-temperature performance. Nickel-based superalloys not only have good high temperature oxidation and hot corrosion resistance, but also have high high temperature deformation strength and fracture strength, so they are widely used in turbine engine blades and other fields; this alone cannot meet the demand; it must Surface modification technology is used ...

Claims

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Application Information

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IPC IPC(8): C23C10/48
CPCC23C10/48
Inventor 李瑞迪蒋俊袁铁锤牛朋达
Owner CENT SOUTH UNIV
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