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Infiltrating agent and method for vapor phase aluminizing of blades

A blade and aluminizing technology, which is applied in the field of vapor phase aluminizing agent for blades, can solve the problems of inability to aluminize the inner cavity, poor spray uniformity, and shorten the service life of the blade, so as to improve the resistance to high temperature oxidation and corrosion, and improve the resistance to Oxidation and corrosion resistance, the effect of improving depth uniformity

Active Publication Date: 2016-09-21
CHINA HANGFA SOUTH IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the solid aluminizing process has disadvantages such as heavy operation and the use of dust harmful to health, which limits its application
The slurry aluminizing process has disadvantages such as complicated procedures, inability to accurately control the spraying thickness, poor spraying uniformity and poor quality of the aluminized layer, which limits its application
The most important thing is that these two aluminizing methods are contact aluminizing technology, which makes these two methods have the following disadvantages: one is that the aluminizing of the blade surface can only be achieved, and the inner cavity cannot be aluminized; Easy to bond, block the inner cavity and blind hole of parts with air holes
However, the depth distribution of the aluminized layer formed by this process is uneven, and the aluminized layer contains defects such as cracks and inclusions, and the depth of the aluminized layer cannot be accurately controlled, thereby reducing the high-temperature oxidation and corrosion resistance of the blade. And further reduce the service life of the blade
For the above problems, there is currently no effective solution

Method used

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  • Infiltrating agent and method for vapor phase aluminizing of blades
  • Infiltrating agent and method for vapor phase aluminizing of blades
  • Infiltrating agent and method for vapor phase aluminizing of blades

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Embodiment 1

[0044] This embodiment provides an infiltration agent and method for vapor phase aluminizing of blades. Among them, the penetrating agent is composed of metal aluminum powder, alumina powder and ammonium chloride powder. 200 mesh, and the metal aluminum powder accounts for 20% of the total weight of the aluminum powder and the alumina powder, and the weight of ammonium chloride accounts for 1% of the weight sum of the metal aluminum powder and the alumina powder.

[0045] The method includes the following steps:

[0046] Step 1, pre-treatment: the blades are cleaned by sand blowing process to remove the dirt on the blades;

[0047] Step 2. Furnace loading: Clamp the cleaned leaves in the birdcage fixture in the furnace tank, and place the infiltration agent on the material tray under the birdcage fixture, and then vacuumize the furnace tank to 0.5KPa. And through the argon to exhaust the air;

[0048] Step 3. Aluminizing: After heating the retort to 950°C under the conditio...

Embodiment 2

[0052] This embodiment provides an infiltration agent and method for vapor phase aluminizing of blades. Among them, the penetrating agent is composed of metal aluminum powder, alumina powder and ammonium chloride powder. 200 mesh, and the metal aluminum powder accounts for 25% of the total weight of the aluminum powder and the alumina powder, and the weight of ammonium chloride accounts for 2% of the weight sum of the metal aluminum powder and the alumina powder.

[0053] The method includes the following steps:

[0054] Step 1, pre-treatment: the blades are cleaned by sand blowing process to remove the dirt on the blades;

[0055] Step 2. Furnace loading: clamp the cleaned leaves in the birdcage fixture in the furnace tank, and place the infiltration agent on the material tray under the birdcage fixture, and then vacuumize the furnace tank to 0.8KPa. And through the argon to exhaust the air;

[0056] Step 3. Aluminizing: After heating the furnace tank to 950°C under the co...

Embodiment 3

[0060] This embodiment provides an infiltration agent and method for vapor phase aluminizing of blades. Among them, the penetrating agent is composed of metal aluminum powder, alumina powder and ammonium chloride powder. 230 mesh, and the metal aluminum powder accounts for 30% of the total weight of the aluminum powder and the alumina powder, and the weight of ammonium chloride accounts for 1.5% of the weight sum of the metal aluminum powder and the alumina powder.

[0061] The method includes the following steps:

[0062] Step 1, pre-treatment: the blades are cleaned by sand blowing process to remove the dirt on the blades;

[0063] Step 2. Furnace loading: Clamp the cleaned leaves in the birdcage fixture in the furnace tank, place the infiltration agent on the material tray under the birdcage fixture, and then vacuum the furnace tank to 0.75KPa, And through the argon to exhaust the air;

[0064] Step 3. Aluminizing: After heating the retort to 950°C under the condition of...

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Abstract

The invention discloses an infiltrating agent and method for vapor phase aluminizing of blades. Wherein, the penetrating agent includes metallic aluminum powder, aluminum oxide powder and ammonium chloride powder in a weight ratio of 1:1.5-4:0.025-0.1. The method comprises the following steps: cleaning the blades; placing the cleaned blades in a furnace tank, and placing the penetrating agent provided by the application at the position below the blades in the furnace tank; vacuumizing the furnace tank to 0.5- 1KPa; after heating the retort to 940-960°C, turn on the circulating fan in the retort, and conduct heat preservation treatment to form an aluminized layer on the surface and inner cavity of the blade; cool the retort to below 100°C, and turn on The furnace can be used to remove the blade; the blade containing the aluminized layer is soaked in hot water. The infiltration agent and method improve the uniformity of the depth distribution of the aluminized layer, thereby improving the high-temperature oxidation and corrosion resistance of the blade, and increasing the service life of the blade.

Description

technical field [0001] The invention relates to the technical field of blade aluminizing, in particular to an infiltrating agent and a method for gas-phase aluminizing of blades. Background technique [0002] In the field of surface protection of engine turbine components, it is necessary to aluminize the blades to improve the high temperature oxidation resistance and thermal corrosion resistance of the blades. Analysis of the Ni-Al phase diagram shows that the aluminizing treatment is mainly to make the active [Al] react with [Ni] on the surface of the nickel-based superalloy blade to obtain the β-(Ni-Al) phase. Commonly used aluminizing processes mainly include solid aluminizing process and slurry aluminizing process. Solid aluminizing is to embed the part of the blade to be aluminized in the infiltration agent and heat it, and then diffuse it through a vacuum furnace to form an aluminized layer. Slurry aluminizing is to apply aluminized slurry on the surface of the blad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C10/08C23C10/60
Inventor 李克王国奇张莉张正义
Owner CHINA HANGFA SOUTH IND CO LTD