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Method for coating workpiece with complex inner cavity structure

A technology for workpieces and inner chambers, applied in the field of coating preparation, can solve the problems of inability to protect and complicate the coating of cooling channels in hollow complex structures, achieve low production costs, high production efficiency, and improve corrosion resistance and high temperature resistance performance effect

Active Publication Date: 2014-08-20
北京九州新科科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the complexity and concealment of the structure of the high-efficiency air-cooled hollow structure cavity, common coating technologies such as physical vapor deposition (PVD) and plasma spraying (PS) cannot be used to protect the cooling channel of the hollow complex structure cavity.

Method used

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  • Method for coating workpiece with complex inner cavity structure

Examples

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Effect test

Embodiment 1

[0032] A method suitable for coating a workpiece with a complex inner cavity structure, the workpiece uses a nickel-based alloy as a substrate, and AlCr particles with an average diameter of 10 mm are used as a donor material.

[0033] The inner and outer surfaces of the nickel-based alloy substrate are treated by particle flow process and sandblasting respectively, and then the nickel-based alloy substrate is purified by ultrasonic cleaning; the nickel-based alloy substrate is placed in the half-height center of the reaction tank; Place AlCr particles with an average diameter of 10mm on the bottom of the nickel-based alloy substrate; vacuumize the reaction tank, and the pressure of the tank is about 1 to 2 mbar; after the reaction tank is heated to 200 ° C, the wet moisture absorbent is completely dried; The independent air guide tube of the tank is filled with hydrogen and HCl gas with a ratio of 4:1, and the tank pressure is kept at 900 mbar; the temperature is raised to 108...

Embodiment 2

[0035] The content of this embodiment is basically the same as that of Embodiment 1, and its difference mainly lies in:

[0036] 1) Donate materials with 90wt.% Si powder and 10wt.% AlCr particles.

[0037] 2) Obtain an Al-rich Al-Si co-infiltrated layer (the mass fraction of Al is more than 30%) in the inner and outer layers of the complex structure of the nickel-based alloy, and the thickness is about 30 μm.

[0038] 3) The infiltrated Al and Si react with Ni to form NiAl(Si) ternary intermetallic compound.

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Abstract

The invention relates to a method for coating a workpiece with a complex inner cavity structure, which sequentially comprises the following steps: cleaning internal and external surfaces of the workpiece, and putting the cleaned workpiece and a donator material into a reaction tank, wherein the donator material is AlCl granules or a Si powder-AlCl granule mixture; vacuumizing the reaction tank, and charging argon into the reaction tank until the pressure is 1-2 millibars; preheating the reaction tank, and charging hydrogen and hydrogen chloride gas into the reaction tank until the pressure in the reaction tank is 800-1000 millibars; and heating the reaction tank to 900-1100 DEG C, and keeping the temperature for 1-2 hours to form the Al infiltration layer or Al-Si co-infiltration layer on the surface of the workpiece, thereby obtaining the coating. The hydrogen chloride and Al-containing donator material react to obtain the aluminum-rich coating, thereby enhancing the corrosion resistance and high temperature resistance of the workpiece; and the method is simple to operate, and has the advantages of low production cost and high production efficiency.

Description

technical field [0001] The invention belongs to the technical field of coating preparation, and in particular relates to a method suitable for coating workpieces with complex inner cavity structures. Background technique [0002] A large number of hollow complex structures, such as aero-engine blades with complex cooling air passages in the inner cavity, have been used for a long time. Scouring, thermal corrosion, high temperature oxidation and thermal cycling, but the corrosion caused first by the inner cavity channel of the complex structure is a significant feature that limits the life of the complex structure of the coating. Therefore, sufficient attention must be paid to the effective protection of the inner cavity, so as to effectively ensure the service life and reliability of the complex structure with high power output and high efficiency. [0003] Applying a protective coating on the surface of the inner cavity of a complex structure to reduce the corrosion rate o...

Claims

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Application Information

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IPC IPC(8): C23C10/28
Inventor 邵玲王广欣赵学义
Owner 北京九州新科科技有限公司
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