Titanium alloy surface high temperature oxidation resistance and wear resistance oxide gradient coat, and preparation method thereof
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A technology of high temperature oxidation resistance and gradient coating, applied in metal material coating process, coating, ion implantation plating and other directions, can solve the problem of poor high temperature oxidation resistance, etc. The effect of improving wear resistance
Active Publication Date: 2012-10-17
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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[0007] Technical problem: Aiming at the shortcomings of titanium alloy's poor high-temperature oxidation resistance and wear resistance and the problems existing in the prior art, the present invention uses double-glow plasma surface metallurgy technology and ion oxygen penetration technology as means to provide a titanium alloy surface with high temperature resistance Oxidation and wear-resistant gradient coating of various oxide systems and its preparation method, greatly improving the high-temperature oxidation resistance and wear resistance of titanium alloys
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Embodiment 1
[0036] (1) Put the titanium alloy TC4 and Al-Cr-Ni alloy targets into the double-glow plasma surface alloying device, use the titanium alloy TC4 as the workpiece pole, and use the Al-Cr-Ni alloy target as the source. The composition ratio of Al-Cr-Ni alloy target material is: Al accounts for 50%, Cr accounts for 40%, and Ni accounts for 10%.
[0037] (2) Vacuumize to the ultimate vacuum degree, and send in argon. Start Glow, and adjust the process parameters to the following values:
[0038] Target voltage: 600 V;
[0039] Workpiece voltage: 400 V;
[0040] Argon pressure: 37 Pa;
[0041] Distance between target and workpiece: 10 mm;
[0042] (3) Stop the glow after 4 hours, cut off the power, and break the vacuum to atmospheric pressure.
[0043] (4) Open the device and take out the Al-Cr-Ni alloy target.
[0044] (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: ...
Embodiment 2
[0053] (1) Put the titanium alloy TC11 and the Al-Cr-Ni alloy target into the double-glow plasma surface alloying device, use the titanium alloy TC11 as the workpiece pole, and use the Al-Cr-Ni alloy target as the source. The composition ratio (mass ratio) of the Al-Cr-Ni alloy target material is: Al accounts for 40%, Cr accounts for 30%, and Ni accounts for 30%.
[0054] (2) Vacuumize to the ultimate vacuum degree, and send in argon. Start Glow, and adjust the process parameters to the following values:
[0055] Target voltage: 700 V;
[0056] Workpiece voltage: 500 V;
[0057] Argon pressure: 52 Pa;
[0058] Distance between target and workpiece: 15 mm;
[0059] (3) Stop the glow after 4 hours, cut off the power, and break the vacuum to atmospheric pressure.
[0060] (4) Open the device and take out the Cr-Ni alloy target.
[0061] (5) Close the device, evacuate to the ultimate vacuum, and send in argon and oxygen. Start Glow, and adjust the process parameters to the ...
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Abstract
The invention relates to a titanium alloy surface high temperature oxidation resistance and wear resistance oxide gradient coat. According to the coat, the surface of the coat is an oxide film layer comprising Al2O3, Cr2O3 and NiO2, wherein the thickness is 4-6 mum; the middle of the coat is an Al-Cr-Ni alloy layer, wherein the thickness is 2-4 mum; and an Al-Cr-Ni-Ti interdiffusion layer is arranged between the coat and a substrate to achieve metallurgical collection, wherein the thickness of the Al-Cr-Ni-Ti interdiffusion layer is 4-6 mum. According to the present invention, the oxide film layer on the surface of the coat has characteristics of compactness, flatness and strong antioxidant capacity; the Al-Cr-Ni alloy layer in the middle of the coat has characteristics of compact structure and high hardness so as to greatly improve wear resistance of the titanium alloy; the metallurgical collection of the coat and the substrate is achieved through the Al-Cr-Ni-Ti interdiffusion layer, and the combination strength is high; and a double glow plasma surface metallurgy technology is adopted to prepare the Al-Cr-Ni alloy layer on the surface of the titanium alloy, and then a plasma oxygen permeation treatment is performed on the Al-Cr-Ni alloy layer to prepare the high temperature oxidation resistance and wear resistance coat, such that the efficiency is high, and the process is simple.
Description
technical field [0001] The invention belongs to the field of preparation of high-temperature oxidation-resistant and wear-resistant coatings, in particular to a high-temperature oxidation-resistant and wear-resistant oxide gradient coating on the surface of a titanium alloy and a preparation method thereof. Background technique [0002] Titanium alloy has the advantages of low density, high specific strength, and corrosion resistance, and is widely used in aerospace, marine engineering, petrochemical, medical and health and other fields. However, titanium alloys have poor resistance to high temperature oxidation. Usually, titanium alloys will undergo severe oxidation spalling at 500-800 °C, and their mechanical properties will drop sharply. This greatly limits the scope of use of titanium alloys. At the same time, the tribological properties of titanium alloy are poor, and when it is used as a sliding part, there is a serious tendency of adhesive wear and fretting wear. ...
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