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Stainless steel low-temperature powder-embedded iron-aluminum co-infiltration agent and embedding infiltration process method

A powder embedding, stainless steel technology, applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve the problems of low aluminum content in the aluminized layer and low aluminum content in the outermost layer, and achieve strong bonding strength, good protection effect, good resistance to medium temperature oxidation and corrosion resistance

Inactive Publication Date: 2015-11-18
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the patent document "a low-temperature powder-embedded aluminizing agent for petroleum oil and casing (CN101165204A)" can form an aluminized layer on the surface of a workpiece to be aluminized under low temperature conditions, the obtained aluminized layer contains zinc element, the aluminized layer shows a step change, the aluminized layer contains low aluminum content, and the outermost layer has the lowest aluminum content

Method used

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  • Stainless steel low-temperature powder-embedded iron-aluminum co-infiltration agent and embedding infiltration process method
  • Stainless steel low-temperature powder-embedded iron-aluminum co-infiltration agent and embedding infiltration process method

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Experimental program
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Effect test

Embodiment 1

[0027] Aluminizing agent composition (weight):

[0028] 30% aluminum powder (Al, 200 mesh), 3% iron powder (Fe, 200 mesh), 36% iron-aluminum powder (Fe-Al, 150 mesh), 30% aluminum trichloride (AlCl 3 ), 1% lanthanum powder (La);

[0029] Processing technology:

[0030] (1) Derust and degrease the surface of the workpiece that needs iron-aluminum co-infiltration treatment, and dry it for later use;

[0031] (2) Mix the above-mentioned penetrating agent components uniformly and then dry them in a vacuum environment below the decomposition temperature of aluminum trichloride; dry the dry-treated penetrating agent with iron-aluminum co-infiltration treatment and have been carried out The pre-treated stainless steel workpieces are placed in the infiltration tank, and sealed with refractory mud mixed with water glass. After drying and solidification, iron-aluminum co-infiltration treatment is carried out in the SX2-4-10 box-type resistance furnace. The method of entering the fu...

Embodiment 2

[0034] Aluminizing agent composition (weight):

[0035] 30% aluminum powder (Al, 200 mesh), 5% iron powder (Fe, 200 mesh), 60% iron-aluminum powder (Fe-Al, 150 mesh), 5% aluminum trichloride (AlCl 3 ).

[0036] Treatment process: (1) Derust and degrease the surface of the workpiece that needs iron-aluminum co-infiltration treatment, and dry it for later use;

[0037] (2) Mix the above-mentioned penetrating agent components uniformly and then dry them in a vacuum environment below the decomposition temperature of aluminum trichloride; dry the dry-treated penetrating agent with iron-aluminum co-infiltration treatment and have been carried out The pre-treated stainless steel workpieces are placed in the infiltration tank, and sealed with refractory mud mixed with water glass. After drying and solidification, iron-aluminum co-infiltration treatment is carried out in the SX2-4-10 box-type resistance furnace. The method of entering the furnace is cold charging, and the cooling m...

Embodiment 3

[0040] Aluminizing agent composition (weight):

[0041] 30% aluminum powder (Al, 200 mesh), 7% iron powder (Fe, 200 mesh), 41% iron-aluminum powder (Fe-Al, 150 mesh), 20% aluminum trichloride (AlCl 3 ), 1% cerium trichloride (CeCl 3 ), 1% lanthanum powder (La).

[0042] Processing technology:

[0043] (1) Derust and degrease the surface of the workpiece that needs iron-aluminum co-infiltration treatment, and dry it for later use;

[0044] (2) Mix the above-mentioned penetrating agent components uniformly and then dry them in a vacuum environment below the decomposition temperature of aluminum trichloride; dry the dry-treated penetrating agent with iron-aluminum co-infiltration treatment and have been carried out The pre-treated stainless steel workpieces are placed in the infiltration tank, and sealed with refractory mud mixed with water glass. After drying and solidification, iron-aluminum co-infiltration treatment is carried out in the SX2-4-10 box-type resistance furna...

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Abstract

The invention discloses a stainless steel low-temperature powder embedding iron-aluminum co-cementation agent and a pack-cementation process method. The stainless steel low-temperature powder embedding iron-aluminum co-cementation agent is characterized in that aluminum powder is taken as main an aluminum supplying agent, iron powder is a main iron supplying agent, iron-aluminum powder is taken as active filler to replace the conventional inactive ceramic powder filler, aluminum trichloride is taken as an activating agent, and a small amount of rare earth chloride can be added to be used as a catalyst; and a process comprises the following steps of: completely and uniformly mixing the cementation agent, then putting the cementation agent and a stainless steel sample to be subjected to iron-aluminum copermeation processing into a cementation tank, mixing sodium silicate with fire clay, carrying out sealing and drying, so as to obtain an iron-aluminum compound alloy layer with the certain thickness, wherein the alumetizing temperature is 380-600 DEG C, and the temperature is kept for 10 or more than 10 hours. The stainless steel low-temperature powder embedding iron-aluminum co-cementation agent has the advantages that the process method is simple, devices required for low-temperature embedding iron-aluminum co-cementation are simple, the cost is low, the aluminum content of the surface of the obtained iron-aluminum compound alloy layer is high, the iron-aluminum compound alloy layer has a very strong binding force with a matrix and good intermediate temperate oxidation resistance and corrosion resistance and can well protect the matrix.

Description

technical field [0001] The invention relates to a stainless steel low-temperature powder-embedded iron-aluminum co-infiltration agent and an embedding infiltration process method. Background technique [0002] Stainless steel blades are the compressor steel turbine rotor blades with the largest number of applications in aero-engines. Their working conditions are surrounded by high-temperature gas, and they not only bear the centrifugal force, aerodynamic force, thermal stress and vibration stress of the blade itself when the turbine rotor rotates at high speed. It is the part with the worst working conditions inside the engine, and the erosion, oxidation and corrosion of high-temperature gas are the main reasons for blade damage. In order to effectively reduce the damage to stainless steel blades due to the above reasons, metal aluminum elements are purposely infiltrated to form an iron-aluminum compound alloy layer with high aluminum content on the surface of stainless stee...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C10/52
Inventor 周贤良许武波陈庆军李晖榕华小珍钟芳兴
Owner NANCHANG HANGKONG UNIVERSITY
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