Surface treatment method for improving welding properties of Si3N4 ceramic and gamma-TiAl alloy
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A technology for surface treatment and welding performance, which is applied in the field of surface treatment to improve the welding performance of Si3N4 ceramics and γ-TiAl alloys. The effect of surface energy
Active Publication Date: 2019-01-08
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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[0008] The present invention combines double glow plasma surface metallurgy method, ion implantation method and Si 3 N 4 The combination of ceramic / γ-TiAl alloy diffusion welding effectively solves the Si 3 N 4 Difficult Welding of Ceramics and γ-TiAl Alloys
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Embodiment 1
[0046] Embodiment 1: prepare the material used for welding, process according to the following steps:
[0047] (1) Put the γ-TiAl alloy and the Ni target into the double-glow plasma surface alloying device, use the γ-TiAl alloy as the workpiece electrode, and use the pure Ni target material (99.95wt%) as the source electrode;
[0048] (2) Vacuumize to the ultimate vacuum, send in argon, start the glow, first clean the target and γ-TiAl alloy, and prepare the nickel alloy layer after cleaning, the steps are as follows:
[0049] (2a) Low-temperature bombardment of the target (plasma cleaning) for 30 minutes to remove scale and impurities on the surface of the target. The process parameters are as follows:
[0050] Target voltage: 650V;
[0051] Workpiece voltage: 0V;
[0052] Argon pressure: 20Pa;
[0053] Distance between target and workpiece: 20mm;
[0054] Cleaning time: 30min;
[0055] (2b) Adjust the voltage of the target to zero, and continue bombarding the γ-TiAl all...
Embodiment 2
[0071] Embodiment 2: prepare the material used for welding, process according to the following steps:
[0072] (1) Put the γ-TiAl alloy and the Ni target into the double-glow plasma surface alloying device, use the γ-TiAl alloy as the workpiece electrode, and use the pure Ni target material (99.95wt%) as the source electrode;
[0073] (2) Vacuumize to the ultimate vacuum, send in argon, start the glow, first clean the target and γ-TiAl alloy, and prepare the nickel alloy layer after cleaning, the steps are as follows:
[0074] (2a) Low-temperature bombardment of the target (plasma cleaning) for 30 minutes to remove scale and impurities on the surface of the target. The process parameters are as follows:
[0075] Target voltage: 750V;
[0076] Workpiece voltage: 0V;
[0077] Argon pressure: 25Pa;
[0078] Distance between target and workpiece: 15mm;
[0079] Cleaning time: 30min;
[0080] (2b) Adjust the voltage of the target to zero, and continue bombarding the γ-TiAl all...
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Abstract
The invention discloses a surface treatment method for improving the welding properties of Si3N4 ceramic and gamma-TiAl alloy. The method comprises the following steps: (1), preparing nickel alloy layer on the surface of the gamma-TiAl alloy from a Ni-Ti alloy target material by adopting a double glow plasma surface metallurgy method, wherein the nickel alloy layer comprises a nickel deposition layer and an inter-diffused layer; (2), injecting Ti ions on the surface of the Si3N4 ceramic through an ion injection method, so as to treat the surface of the Si3N4 ceramic; and (3), welding the gamma-TiAl alloy treated through the double glow plasma surface metallurgy method in the first step and the Si3N4 ceramic subjected to surface treatment in the second step in vacuum diffusion welding equipment. According to the method, the nickel alloy layer is prepared on the surface of the gamma-TiAl alloy, the Ti ions are injected to the surface of the Si3N4 ceramic through the ion injection method,and the vacuum diffusion welding between the Si3N4 ceramic and the gamma-TiAl alloy can be directly realized. The method is high in efficiency, and can greatly improve the application of vacuum diffusion welding to the welding technology of the Si3N4 ceramic and the gamma-TiAl alloy.
Description
technical field [0001] The invention relates to a ceramic material welding technology, in particular to a method for improving Si 3 N 4 Surface treatment method for welding properties of ceramics and γ-TiAl alloy. Background technique [0002] γ-TiAl alloy has the characteristics of low density, high specific strength and high specific modulus, and has high high temperature strength and stiffness as well as good creep resistance, making it an extremely heat-resistant structure for aviation, aerospace and automotive engines. Competitive materials of construction. However, with the continuous increase of thrust-to-weight ratio and vortex front temperature of aero-engines, the working conditions of engine parts become more complex and harsh. However, the high temperature oxidation resistance of γ-TiAl alloy is poor. Under high temperature and high pressure (800-950°C), the surface of γ-TiAl alloy is prone to continuous oxidation spalling, which cannot meet the service requir...
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