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NiCrAIY coating for nickel base high temperature alloy and preparation method thereof

A nickel-based superalloy and coating technology, applied in metal material coating process, coating, solid-state diffusion coating, etc. The effect of low production cost, improved service life, and improved thermal corrosion resistance

Active Publication Date: 2011-07-06
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The invention makes up for the deficiencies of the existing NiCrAlY coating preparation method: the problem of uneven thickness and non-dense coating on the surface of complex-shaped workpieces caused by line-of-sight effects; its manufacturing cost is more than 8 times higher than that of traditional thermal diffusion methods

Method used

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  • NiCrAIY coating for nickel base high temperature alloy and preparation method thereof
  • NiCrAIY coating for nickel base high temperature alloy and preparation method thereof
  • NiCrAIY coating for nickel base high temperature alloy and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0043] NiCrAlY co-infiltration coating was prepared by thermal diffusion method with Ni-based superalloy K417G as substrate. The implementation process is as follows: First, remove the oxide layer on the surface of the superalloy, grind it to 800# with SiC sandpaper to obtain a flat surface, clean it with acetone and ultrasonic waves, and dry it. The treated substrate was sprayed with Y-rich slurry (20% Y (wt)), the slurry thickness was 0.8mm, and dried at 100°C. Secondly, the parts that have been sprayed with Y slurry are embedded in Cr-containing powder, and the powder components are Cr, Ni, Al 2 o 3 and NH 4 Cl. Diffusion at 1050°C for 1 hour in an argon-protected atmosphere. Finally, put the parts containing Y-Cr coating into FeAl powder and NH 4 In the mixed powder of Cl, in the atmosphere of argon protection, diffuse at 1000°C for 4 hours to obtain NiCrAlY co-infiltration coating. The coating microstructure is as figure 1 shown. After 300 hours of high temperatur...

Embodiment 2

[0045] NiCrAlY co-infiltration coating was prepared by thermal diffusion method with Ni-based superalloy K438G as substrate. Implementation technique is as embodiment 1. After 300 hours of high temperature oxidation test at 1000℃, the weight gain of the coating is 0.88mg / cm 2 , a uniform aluminum oxide film was formed on the surface. The coating is coated with 25%NaCl+75%Na 2 SO 4 (wt%) salt, the amount of salt applied is 1.0-1.5mg / cm 2 , after 900 ℃ hot corrosion test for 100h, a dense aluminum oxide film was formed on the surface, and the remaining 55% of the coating remained unchanged.

Embodiment 3

[0047] NiCrAlY co-infiltration coating was prepared by thermal diffusion method with Ni-based superalloy GH4037 as substrate. Implementation technique is as embodiment 1. After 1000℃ high temperature oxidation test for 300 hours, the weight gain of the coating is 0.95mg / cm 2 , a uniform aluminum oxide film was formed on the surface. The coating is coated with 25%NaCl+75%Na 2 SO 4 (wt%) salt, the amount of salt applied is 1.0-1.5mg / cm 2 , after 900 ℃ hot corrosion test for 100h, a dense aluminum oxide film was formed on the surface, and the remaining 70% of the coating remained unchanged.

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Abstract

The invention relates to a NiCrAIY coating for nickel base high temperature alloy. The NiCrAIY coating for the nickel base high temperature alloy is characterized by comprising the following components by weight: 8-25 percent of Cr, 30-40 percent of Al and 0.3-1.5 percent of Y. The NiCrAIY coating and the preparation method thereof can effectively prolong the service life of high temperature alloy components. The inoxidizability of a matrix can be effectively improved under the environment with the temperature below 1100 DEG C; and the hot corrosion resistance of the matrix can be improved under the Cl-containing hot corrosion environment with the temperature below 900 DEG C. The equipment investment and the production cost of the thermal diffusion preparation method are far lower than the existing methods such as thermal spraying, vacuum physical vapor deposition, and the like. Therefore, the NiCrAIY coating and the preparation method thereof have foreseeable tremendous economic value and social value.

Description

Technical field: [0001] The invention relates to the technical field of surface coatings, and in particular provides a NiCrAlY coating for a new nickel-based superalloy with excellent thermal corrosion resistance and high temperature oxidation resistance and a thermal diffusion preparation method thereof. Background technique: [0002] In the prior art, Ni-based superalloys have good creep properties and high high-temperature durable strength, and are widely used in hot end parts of gas turbines. In order to improve its service life, measures such as applying high-temperature protective coatings are generally adopted. [0003] At present, MCrAlY cladding coating is the most widely used high-temperature protective coating on superalloy turbine blades of aero-engines and gas turbine generator sets. Its typical phase structure is: the main phase is γ-Ni phase, including β-NiAl phase and γ′-Ni 3 Al phase [see literature 1: Sims CT, Stoloff NS, Hagel WC. Superalloys II. New Yor...

Claims

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Application Information

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IPC IPC(8): C23C10/58
Inventor 朱圣龙王福会鲁金涛辛丽王文
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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