Method for diffusion coating of LaTaAlY alloy layer on surface of gamma-TiAl alloy

A kind of alloy layer and alloy technology, applied in metal material coating process, coating, sputtering plating, etc., can solve the problems of oxidation resistance decline, hydrogen embrittlement, hard coating easy to peel off, etc., and achieve outstanding engineering value , to ensure effectiveness and durability, to enhance the effect of the effect

Active Publication Date: 2015-03-04
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 diffusion coating of LaTaAlY alloy layer on surface of gamma-TiAl alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Furnace loading: place the LaTaAlY target on the source frame, and place the γ-TiAl alloy workpiece 25mm below the source frame.

[0023] 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 30Pa.

[0024] Workpiece surface activation: turn on the cooling water, turn on the power supply of the workpiece, apply a voltage of -400V, and use the plasma beam generated by glow discharge to bombard the workpiece for about 30 minutes. On the one hand, the workpiece is further cleaned, and on the other hand, the surface of the workpiece is activated for on the adsorption of active atoms.

[0025] Plating: apply source power -600V, until the LaTaAlY target is slightly melted, then adjust the voltage to -350V ~ -400V to maintain. Then add the workpiece voltage to -1100V to make the temperature of the workpiece reach 950°C, and then adjust it to -800~-950V to maintain the temperature.

[0026] Coo...

Embodiment 2

[0030] Furnace loading: place the LaTaAlY target on the source frame, and place the γ-TiAl alloy workpiece 25mm below the source frame.

[0031] 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 30Pa.

[0032] Workpiece surface activation: turn on the cooling water, turn on the power supply of the workpiece, apply a voltage of -400V, and use the plasma beam generated by glow discharge to bombard the workpiece for about 30 minutes. On the one hand, the workpiece is further cleaned, and on the other hand, the surface of the workpiece is activated for on the adsorption of active atoms.

[0033]Plating: Apply source voltage -600V until the LaTaAlY target is slightly melted, then adjust the voltage to -350~-400V to maintain. Then add the workpiece voltage to -1000V to make the temperature of the workpiece reach 900°C, and then adjust it to -800~-900V to maintain the temperature.

[0034] Coolin...

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Abstract

The invention discloses a method for diffusion coating of a LaTaAlY alloy layer on the surface of gamma-TiAl alloy. The method comprises the following steps: heating a gamma-TiAl alloy workpiece and an LaTaAlY target material by utilizing glow discharge of two hollow cathodes; putting the LaTaAlY target material on a source electrode rack, heating to melt the LaTaAlY target material under bombardment of plasmas generated by glow discharge, so as to form evaporation and sputtering, depositing on the surface of the workpiece and diffusing inwards; and forming an LaTaAlY deposition layer which is 3-10 mu m and an LaTaAlY diffusion layer which is 5-10 mu m on the surface of the workpiece by regulating and controlling the working pressure, the source electrode voltage, the workpiece voltage and the source electrode-workpiece distance. By adopting the method, a diffusion coating treatment is carried out on the surface of the gamma-TiAl alloy workpiece, an excellent oxidation resistance can be given to the gamma-TiAl alloy workpiece under a high-temperature long-term service condition, and moreover the gamma-TiAl alloy workpiece has reliable bonding strength and excellent thermal shock resistance due to the existence of the diffusion layer with gradient compositions.

Description

technical field [0001] The invention relates to the technical field of surface protection of aero-engine parts, in particular to a method for infiltrating a LaTaAlY alloy layer on the surface of a γ-TiAl alloy. Background technique [0002] γ-TiAl alloy has high high temperature yield strength, high creep resistance and fracture toughness, and low notch sensitivity. Compared with traditional nickel-based superalloys, it has higher specific strength and is ideal for aerospace and aerospace vehicles. New high temperature structural materials. However, at high temperatures exceeding 750 °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 effective use temperature of the current γ-TiAl alloy cannot meet the working requirements of the hot end parts of the engine. [0003] Under normal oxidation conditions, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/34C23C14/16
CPCC23C10/14C23C14/16C23C14/32
Inventor 梁文萍徐一缪强张志刚蒋穹任蓓蕾崔世宇夏金娇
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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