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Method for diffusing and plating aluminum on surface of titanium-aluminium intermetallic compound

An intermetallic compound and aluminum-based technology, applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of easy peeling off of hard coating, hydrogen embrittlement, and decline in oxidation resistance, and achieve anti-oxidation Strong thermal shock resistance, ensuring effectiveness and durability, and outstanding engineering value

Inactive Publication Date: 2012-07-18
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional hard coating is easy to peel off, the oxidation resistance of the alloy coating decreases rapidly due to interdiffusion during long-term service at high temperature, and the traditional chemical heat treatment easily leads to hydrogen embrittlement.

Method used

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  • Method for diffusing and plating aluminum on surface of titanium-aluminium intermetallic compound
  • Method for diffusing and plating aluminum on surface of titanium-aluminium intermetallic compound
  • Method for diffusing and plating aluminum on surface of titanium-aluminium intermetallic compound

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Aluminum infiltration on the surface of γ-TiAl alloy sample

[0026] (1) Sample pretreatment . Clean and dry the surface of the sample, if necessary, polish and then clean.

[0027] (2) Furnace . according to figure 2 Place the seepage source and the workpiece in the layout method shown, and adjust the electrode spacing within the range of 10~50mm.

[0028] (3) Vacuum . Close the air inlet, turn on the vacuum pump, and pump the air pressure in the furnace to 10 -1 Below Pa, then pass argon to the working pressure of 30Pa.

[0029] (4) Plasma cleaning samples . Start the power supply, first turn on the workpiece power supply, apply -400V voltage, and use the plasma beam generated by glow discharge to bombard the workpiece for about 30 minutes. On the one hand, the sample is further cleaned, and on the other hand, the surface is activated to facilitate the adsorption of active atoms. .

[0030] (5) Plating . After the pre-bombardment, the source voltag...

Embodiment 2

[0035] Ti 2 AlNb Alloy Sample Surface Plated with Aluminum

[0036] (1) Sample pretreatment . Clean and dry the surface of the sample, if necessary, polish and then clean.

[0037] (2) Furnace . according to figure 2 Place the seepage source and the workpiece in the layout method shown, and adjust the electrode spacing within the range of 10~50mm.

[0038] (3) vacuuming. Close the air inlet, turn on the vacuum pump, and pump the air pressure in the furnace to 10 -1 Below Pa, then pass argon to the working pressure of 30Pa.

[0039] (4) Plasma cleaning samples. Start the power supply, first turn on the workpiece power supply, apply -400V voltage, and use the plasma beam generated by glow discharge to bombard the workpiece for about 30 minutes. On the one hand, the sample is further cleaned, and on the other hand, the surface is activated to facilitate the adsorption of active atoms. .

[0040] (5) Plating . After the pre-bombardment, the source voltage -600V ...

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Abstract

The invention relates to a method for diffusing and plating aluminum on the surface of a titanium-aluminium intermetallic compound, comprising the following steps of: placing a pure aluminium product in a conductive crucible to form a diffusing-plating source electrode, and then placing the crucible into a vacuum chamber, placing a titanium-aluminium intermetallic compound workpiece above the crucible and filling argon into the vacuum chamber, applying direct current negative voltage to smelt an aluminium product in the source electrode and keeping a discharging and sputtering state, and then, applying negative voltage to the titanium-aluminium intermetallic compound workpiece to raise the temperature of the workpiece to 700-1200 DEG C, keeping the temperature for 0.5-8 hours to complete diffusing and plating operation. The surface of a diffused and plated workpiece is provided with a high-temperature antioxidant protective layer with a settled layer and a diffusion layer, and 3-10mu m compact Al on the outer layer can give alloy to have sufficient oxidation resistance, and a 50-200mu m of diffusion layer below the settled layer can preventing Al atoms of the settled layer from diffusing rapidly to a matrix when in long-time high-temperature service and enhance the bonding force of the functional settled layer and the matrix.

Description

[0001] technical field [0002] The invention designs a surface protection technology of aero-engine parts, specifically a surface anti-high temperature oxidation protection technology of plasma plating Al on the surface of a Ti-Al intermetallic compound. [0003] Background technique [0004] Ti-Al intermetallic compounds (γ-TiAl, Ti 3 Al, Ti 2 AlNb, etc.) have high high temperature yield strength, high creep resistance and fracture toughness, and low notch sensitivity. High temperature structural materials. However, at high temperatures exceeding 700 °C, the oxidation resistance of Ti-Al intermetallic compounds drops sharply. At the same time, due to the infiltration of N and O atoms at high temperature, the alloy is prone to subsurface embrittlement. Therefore, the current effective use temperature of Ti-Al intermetallic compounds cannot meet the working requirements of the hot end parts of the engine. [0005] Under normal oxidation conditions, the main constituent ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C10/00C23C10/08
Inventor 梁文萍缪强张平则姚正军任蓓蕾徐一李龙杨晶晶
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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