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Method for diffusing and plating aluminum on surface of titanium-aluminium intermetallic compound
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A technology of infiltration and surface cleaning, applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve the problems of easy peeling of hard coatings, decreased oxidation resistance, hydrogen embrittlement, etc. Strong seismicity, outstanding engineering value, ensuring effectiveness and durability
Inactive Publication Date: 2014-08-13
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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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.
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Embodiment 1
[0021] Aluminum infiltration on the surface of γ-TiAl alloy sample
[0022] (1) Sample pretreatment . Clean and dry the surface of the sample, if necessary, polish and then clean.
[0023] (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.
[0024] (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.
[0025] (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. .
[0026] (5) Plating . After the pre-bombardment, the source voltag...
Embodiment 2
[0031] Ti 2 AlNb Alloy Sample Surface Plated with Aluminum
[0032] (1) Sample pretreatment . Clean and dry the surface of the sample, if necessary, polish and then clean.
[0033] (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.
[0034] (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.
[0035] (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. .
[0036] (5) Plating. After the pre-bombardment, the source voltage -600V ...
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Abstract
A method for plating aluminum on the surface of a titanium-aluminum intermetallic compound, comprising the following steps: placing a pure aluminum material in a crucible, the crucible conducts electricity to form a plating source, and then putting the crucible into a vacuum chamber, and the titanium-aluminum system Place the intermetallic compound workpiece above the crucible and fill the vacuum chamber with argon gas, apply a DC negative voltage to melt the aluminum in the source and maintain the discharge sputtering state, and then apply a negative voltage to the titanium-aluminum intermetallic compound workpiece to heat the workpiece To 700~1200℃, keep warm for 0.5~8h to complete the penetration plating. The surface of the permeated workpiece has a high-temperature anti-oxidation protective layer with a structure of a deposition layer and a diffusion layer. The dense Al deposition layer of 3-10 μm in the outer layer can endow the alloy with sufficient oxidation resistance. The 50-200 μm diffusion layer below it can hinder the rapid diffusion of Al atoms in the deposition layer into the matrix during long-term high-temperature service, and enhance the bonding force between the functional deposition layer and the substrate.
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. Background technique [0003] 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. [0004] Under normal oxidation conditions, the main constituent phase of t...
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