Electronic beam physical vapor deposition method for large-area uniform deposition of thermal barrier coating layers

Abstract

The invention discloses an electronic beam physical vapor deposition method for large-area uniform deposition of thermal barrier coating layers. The method comprises the following steps: multiple crucibles with inner diameters of 50-70 mm are mounted; center gaps of the crucibles are set as 300-600 mm; vertical distances from the crucibles to workpieces are set as 270-660 mm; the surfaces of the workpieces are treated; the surface-cleaned workpieces are fixed on rotating shafts; the workpieces are heated; coating layer materials are injected in the crucibles; the coating layer materials in thecrucibles are heated and evaporated through electronic beams to form stable steam clouds above the middles of the crucibles; the workpieces are fed in the steam clouds; the workpieces are rotated through the rotating shafts to deposit coating layers; after the deposition of the coating layers is finished, the electronic beams are closed; the workpieces are taken out after cooling of the workpieces; and uniform thermal barrier coating layers are obtained on the surfaces of the workpieces. The method solves the difficulty of preparation of the uniform thermal barrier coating layers for large-size aero-engine turbine blades by the electronic beam physical vapor deposition technology.

Description

technical field [0001] The invention relates to the technical field of thermal barrier coatings, in particular to an electron beam physical vapor deposition method for uniformly depositing thermal barrier coatings over a large area. Background technique [0002] At present, thermal barrier coatings are generally prepared by spraying or electron beam physical vapor deposition technology. The coating structure prepared by spraying technology is lamellar, and the coating structure prepared by electron beam physical vapor deposition technology is columnar crystal structure. The two structures The thermal barrier coating is widely used on engine hot end parts. Compared with spraying technology, the thermal barrier coating prepared by electron beam physical vapor deposition technology has high stress tolerance, prolongs the thermal shock resistance of the coating, and can maintain a long life of the coating under alternating thermal shocks, but is limited Due to equipment limitat...

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Problems solved by technology

[0004] However, the above two methods have disadvantages: 1) the overlapping area of ​​the coating is not easy to control, and the uniformity of the coating cannot be guaranteed; 2) the size of the crucible cannot be infinitely increased

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