Constant-angle speed changing device applied to vapor-phase deposition of coating of blade and control method

Abstract

The invention discloses a constant-angle speed changing device applied to vapor-phase deposition of a coating of a blade and a control method. The constant-angle speed changing device comprises a servo motor driving circuit, an additional control circuit and a cam; the cam is capable of changing the rotation speed of a blade-rotating servo driving motor, so that the rotation speed of the blade is related to the rotation angle of the blade; when the shielded surface of the blade rotates to the position which directly faces an ionic group, the rotation speed of the blade is reduced; the time for forming the coating by the ionic group is prolonged, so that the thickness of the coating is more uniform. In addition, the constant-angle speed changing device is capable of depositing the area, with unequal thickness requirement, of the blade surface coating; the residence time in the area with relatively high thickness is long; the residence time of the area with relatively low thickness is short; meanwhile, the device is used for depositing and processing the surface coatings of a turbine working blade and a turbine guide blade; the device is also applicable to the deposition coatings of multi-layer (2-5 layers) guide blades. The device is capable of depositing and processing multiple coating systems such as MCrAlY coatings, YSZ coatings, Al2O3 coatings and TiN coatings.

Description

technical field [0001] The invention belongs to electron beam physical vapor deposition technology, and is used for electron beam physical vapor deposition of MCrAlY, YSZ, Al on blade surface 2 o 3 , TiN and other coating systems, specifically a fixed-angle speed change device and control method for blade vapor deposition coating. Background technique [0002] Electron beam physical vapor deposition (EB-PVD) technology has the advantages of high deposition rate, dense coating, easy and precise control of chemical composition, columnar crystal structure, no pollution and high thermal efficiency. It can be used to prepare thermal barrier coatings, wear-resistant coatings, anti-corrosion coatings, micro-layer materials, etc. [0003] The working principle of electron beam physical vapor deposition technology is as follows: figure 1 As shown, when the blade is clamped with the workpiece shaft according to the position shown in the figure, the servo motor is started, and the s...

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Problems solved by technology

and figure 2 The blade airfoil shown in the A-A section shows that the two airfoils shield each other, and most of the plasma of the material to be plated is blocked by the outer surface of the airfoil and cannot enter the gap formed by the two airfoils

As a result, the plasma concentration in the crevice space formed by the blade body is reduced, and the coating deposition rate is lower than that of other parts of the blade

After coating for a long enough time according to the original process, the surface that is difficult to form a coating can only form a much thinner coating than other surfaces, which will affect the performance of the coating.

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