Gamma-TiAl alloy surface high temperature oxidation resistance and wear resistance coat, and preparation method thereof
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A high-temperature oxidation-resistant and wear-resistant technology, applied in chemical instruments and methods, metal material coating processes, coatings, etc., can solve the problems of poor high-temperature oxidation resistance and wear resistance
Active Publication Date: 2012-10-17
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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[0007] Technical problem: In view of the shortcomings of the high-temperature oxidation resistance and poor wear resistance of γ-TiAl alloys and the problems existing in the prior art, the present invention combines the double-glow plasma surface metallurgy technology and the plasma ion oxygen penetration technology to provide a γ-TiAl alloy The high-temperature oxidation-resistant and wear-resistant coating on the surface of the alloy and its preparation method greatly improve the high-temperature oxidation resistance and wear resistance of the γ-TiAl alloy
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Embodiment 1
[0034] (1) Put the γ-TiAl alloy and Cr-Ni alloy targets into the double-glow plasma surface alloying device, use the titanium alloy as the workpiece electrode, and use the Cr-Ni alloy target as the source electrode. The composition ratio of the Cr-Ni alloy target material is as follows: Cr accounts for 80 wt%, and Ni accounts for 20 wt%.
[0035] (2) Vacuumize to the ultimate vacuum degree, and send in argon. Start Glow, and adjust the process parameters to the following values:
[0036] Target voltage: 700 V;
[0037] Workpiece voltage: 400 V;
[0038] Argon pressure: 42 Pa;
[0039] Distance between target and workpiece: 10 mm;
[0040] (3) Stop the glow after 4 hours, cut off the power, and break the vacuum to atmospheric pressure.
[0041] (4) Open the device and take out the Cr-Ni alloy target.
[0042] (5) Close the device, evacuate to the ultimate vacuum, and send in argon and oxygen. Start Glow, and adjust the process parameters to the following values:
[0043...
Embodiment 2
[0051] (1) Put the γ-TiAl alloy and Cr-Ni alloy targets into the double-glow plasma surface alloying device, use the γ-TiAl alloy as the workpiece electrode, and use the Cr-Ni alloy target as the source electrode. The composition ratio of the Cr-Ni alloy target material is as follows: Cr accounts for 60 wt%, and Ni accounts for 40 wt%.
[0052] (2) Vacuumize to the ultimate vacuum degree, and send in argon. Start Glow, and adjust the process parameters to the following values:
[0053] Target voltage: 800 V;
[0054] Workpiece voltage: 500 V;
[0055] Argon pressure: 65 Pa;
[0056] Distance between target and workpiece: 15 mm;
[0057] (3) Stop the glow after 4 hours, cut off the power, and break the vacuum to atmospheric pressure.
[0058] (4) Open the device and take out the Cr-Ni alloy target.
[0059] (5) Close the device, evacuate to the ultimate vacuum, and send in argon and oxygen. Start Glow, and adjust the process parameters to the following values:
[0060] ...
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Abstract
The invention relates to a gamma-TiAl alloy surface high temperature oxidation resistance and wear resistance coat. According to the coat, the surface of the coat is an oxide film layer comprising Cr2O3 and NiO2, wherein the thickness is 2-3 mum; the middle of the coat is a Cr-Ni alloy layer, wherein the thickness is 2-4 mum; and a Cr-Ni-Ti-Al interdiffusion layer is arranged between the coat and a substrate to achieve metallurgical collection, wherein the thickness of the Cr-Ni-Ti-Al interdiffusion layer is 4-6 mum. According to the present invention, the Cr2O3 and NiO2 oxide film on the surface of the coat has characteristics of compact structure and strong antioxidant capacity; the Cr-Ni alloy layer in the middle of the coat has characteristics of uniform structure and high hardness so as to greatly improve wear resistance of the gamma-TiAl alloy; the metallurgical collection of the coat and the substrate is achieved through the Cr-Ni-Ti-Al interdiffusion layer, and the combination strength is high; and a double glow plasma surface metallurgy technology and a plasma oxygen permeation technology are firstly combined in the coat preparation process of the present invention, special plasma oxygen permeation equipment is not required, the coat can be directly prepared in 5 hours by adopting double glow plasma surface metallurgy equipment, the process is simple, and the efficiency is high.
Description
technical field [0001] The invention belongs to the technical field of high-temperature oxidation-resistant and wear-resistant coatings, and in particular relates to a high-temperature oxidation-resistant and wear-resistant coating on the surface of a γ-TiAl alloy and a preparation method thereof. Background technique [0002] The proportion of γ-TiAl alloy is about 50% of that of nickel-based superalloy, and its main high-temperature mechanical properties are close to or better than nickel-based superalloy, but it has higher specific strength and specific elastic modulus than nickel-based superalloy. Therefore, γ-TiAl alloy is a new and important weight-reducing material used in high-temperature components of industrial steam turbines, advanced automobiles or aero-engines instead of nickel-based alloys. However, an important defect of γ-TiAl alloy is poor high-temperature oxidation resistance, and the surface is prone to continuous oxidation and spalling at normal pressure ...
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