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Preparation method for in-situ synthesized nano-crystalline NiAl/Ni3Al intermetallic compound coating

An in-situ synthesis, nanocrystalline technology, applied in the direction of pressure inorganic powder coating, etc., can solve the problems of low fracture resistance and high temperature strength, poor temperature plasticity, stress cracking, etc., and achieve the effect of good coating density and good bonding.

Active Publication Date: 2018-11-23
XINYU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

NiAl intermetallic compound is recognized as an important high-temperature protective coating material because of its high strength, high temperature oxidation resistance, sulfidation resistance, molten salt corrosion and wear resistance. However, due to the poor room temperature plasticity and fracture of NiAl intermetallic compound coating Insufficiencies such as resistance and high-temperature strength limit its use as a high-temperature structural coating, and there are problems in the preparation process of NiAl coatings such as changes in composition and structure caused by phase transformation, defects, and stress cracks caused by differences in thermal expansion coefficients.

Method used

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  • Preparation method for in-situ synthesized nano-crystalline NiAl/Ni3Al intermetallic compound coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Select NiAl powder with a particle size of 50nm and Ni powder with a particle size of 30nm, and obtain agglomerated and coated NiAl / Ni composite powder with a volume fraction of nano-NiAl of 20vol.% through mechanical alloying technology, wherein the ball-to-material ratio is 10: 1. The rotation speed is 250rpm, and the ball milling time is 18h. After the 316L stainless steel and Al plate are subjected to sandblasting and roughening treatment, the agglomerated coated NiAl / Ni composite powder obtained after passing the sieving is used as the spraying material, and the cold spray system is used to deposit NiAl / Ni on the surface of the 316L stainless steel and Al plate. Composite coatings, where the spray gas uses N 2 , the acceleration gas pressure is 2.0MPa, the powder feeding gas pressure is 2.2MPa, the spraying temperature is 300°C, the spraying distance is 10mm, and the coating thickness is 200μm. Put the sprayed coating into an electric furnace protected by an inert...

Embodiment 2

[0025] Select NiAl powder with a particle size of 20nm and Ni powder with a particle size of 10nm, and obtain agglomerated and coated NiAl / Ni composite powder with a volume fraction of nano-NiAl of 40vol.% through mechanical alloying technology, wherein the ball-to-material ratio is 15: 1. The rotation speed is 180rpm, and the ball milling time is 20h. After the 316L stainless steel and Al plate are subjected to sandblasting and roughening treatment, the agglomerated coated NiAl / Ni composite powder obtained after sieving is used as the spraying material, and the NiAl / Ni composite coating is deposited on the surface by a cold spray system. Among them, the spray gas uses N 2 , the acceleration gas pressure is 2.0MPa, the powder feeding gas pressure is 2.2MPa, the spraying temperature is 250°C, the spraying distance is 10mm, and the coating thickness is 250μm. After spraying, the coating is placed in an electric furnace protected by inert gas for heat treatment, and the temperat...

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Abstract

The invention discloses a preparation method for an in-situ synthesized nano-crystalline NiAl / Ni3Al intermetallic compound coating. The preparation method comprises the following steps of preparing NiAl / Ni composite powder with the NiAl content of 20 vol.%-40 vol.% by using nano-structure NiAl and Ni powder under the inert gas protection through a mechanical alloying technology, screening the NiAl / Ni composite powder, and collecting the NiAl / Ni composite powder with the size of 30-50 [mu]m; performing sand blasting and coarsening pretreatment to base materials, and then preparing a NiAl / Ni composite coating with the thickness of 200 [mu]m-300 [mu]m through deposition on the surface of the pretreated base materials with a cold spraying system; and then placing the coating in inert gas environment for heat treatment for 5-15 hours. The preparation method benefits control over interparticle bonding, particle size and distribution of intermetallic compounds; and the compactness of the prepared coating is high; and the preparation method is easy to operate and lower in cost, and is especially suitable for industrial application and promotion.

Description

technical field [0001] The invention relates to the field of coating preparation, in particular to an in-situ synthesized nanocrystalline NiAl / Ni 3 Preparation method of Al double intermetallic compound coating. Background technique [0002] High temperature protective coatings applied to aerospace engine turbine blades and guide vanes need to have good high temperature oxidation resistance and certain strength and toughness. However, in the existing high-temperature protective coatings, the diffusion aluminized layer has problems such as low service temperature (<900°C), low plasticity, and easy peeling off. To modify the aluminide coating to improve its high temperature oxidation resistance, but the process control is more complicated. During the oxidation process of MCrAlY coating, the formation and growth of thermally grown oxide (TGO) and the MCrAlY bottom layer and ceramic layer (ZrO 2 ~8%Y 2 o 3 ) The increase in internal stress caused by the difference in the...

Claims

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Application Information

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IPC IPC(8): C23C24/04
CPCC23C24/04
Inventor 陈枭胡瑶李承娣张小伟
Owner XINYU UNIV
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