Repair method of superalloy single crystal blade tip based on eb-pvd
A single crystal blade, superalloy technology, applied in metal material coating process, vacuum evaporation coating, coating and other directions, can solve the problem of not suitable for single crystal blade tip repair and so on
Active Publication Date: 2022-05-17
BEIHANG UNIV
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Problems solved by technology
However, as far as the current EB-PVD equipment is concerned, it is basically developed for various thin films and coatings, and its heating method is basically from above the workpiece, which is not suitable for the repair of single crystal blade tips.
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[0056] The following will clearly and completely describe the technical solutions in specific embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0057] Such as figure 1 Shown, a kind of EB-PVD device comprises:
[0058] Vacuum unit for providing a vacuum working environment for electron beam evaporation;
[0059] 4 first electron guns 1, installed above the surface to be deposited 4, for evaporating and depositing the target material 3;
[0060] 1 second electron gun 2, installed below the surface to be deposited 4, for heating the surface to be deposited 4 from below;
[0061] A cathode power supply unit, loaded on both ends of the cathode of the electron gun, is us...
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Abstract
The invention discloses an EB‑PVD device and an alloy workpiece repair method, and is especially suitable for repairing the wear of the tip of a high-temperature alloy single crystal blade. The electron beam is used to heat the deposition surface from below. During the deposition process, the electron beam interacts with the atoms or atomic clusters of the deposited coating to increase the energy of the coating particles, which is conducive to improving the bonding force between the coating and the substrate interface and the deposition. The compactness of the coating; secondly, the electron beam heating from the repaired end face of the blade can form a temperature field in which the temperature gradually decreases from the deposition surface to the single crystal substrate, which is conducive to the directional growth of the coating; finally, the electron beam can be heated by controlling the deposition parameters. The range is limited to a specific area to avoid damage to the single crystal substrate. Applying EB‑PVD equipment with lower heating function to repair single crystal blades can avoid the replacement of expensive nickel-based single crystal blades only due to wear and tear, greatly reducing engine operating costs, improving engine efficiency and extending service life.
Description
technical field [0001] The invention belongs to the technical field of repairing alloy workpieces, and in particular relates to a repairing device and method for a superalloy single crystal blade tip based on electron beam physical vapor deposition (EB-PVD). Background technique [0002] Turbine blades are now generally made of high-strength, high-temperature-resistant Ni-based superalloys, and more and more rare metals and refractory metal elements are added, which is expensive. At the same time, the complex internal cooling structure of the turbine blade further increases the manufacturing cost of the blade. According to statistics, the cost of a single crystal guide vane is between 40,000 and 100,000 US dollars. During engine operation, turbine rotor blades and guide vane components are severely damaged, including thermal fatigue cracks, surface oxidation, creep, thermal corrosion or degradation caused by erosion, among which the service environment of turbine rotor blad...
Claims
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IPC IPC(8): C23C14/30C23C14/16
CPCC23C14/30C23C14/16
Inventor 孙井永彭王强
Owner BEIHANG UNIV