A uniform preheating method for complex surface workpieces for ps-pvd

Abstract

The invention discloses a uniform preheating method for PS‑PVD workpieces with complex profiles. In order to solve the problem of uniform preheating of workpieces with complex profiles by traditional high-energy beam jets, an external heating body is used for heating in engineering practice. Due to the technical problem of difficult operation and high cost, by designing the workpiece preheating device, three anode plates are set around the workpiece, and the arc is struck before spraying, so that the cathode of the spray gun and the three anode plates in the preheating system generate a transferred ion arc. The high temperature of the transferred ion arc and the anode plate radiates and uniformly heats the workpiece with complex profiles. Before spraying, the surface of workpieces with complex shapes and different sizes can be evenly heated in situ, which improves the uniformity of the coating on the surface of the workpiece and greatly reduces the production cost.

Description

technical field [0001] The invention belongs to the technical field of plasma physical vapor deposition preparation of thermal barrier coatings, and in particular relates to a uniform preheating method for PS-PVD workpieces with complex profiles. Background technique [0002] Thermal barrier coatings (TBCs for short) is a high-temperature thermal protection technology that uses high-temperature resistant, low thermal conductivity, and corrosion-resistant ceramic materials to compound with alloys in the form of coatings to reduce the surface temperature of alloys in high-temperature environments. The use of TBCs on engine blades can significantly increase the operating temperature of the engine, thereby increasing the working efficiency and thrust of the engine, and at the same time can reduce the working temperature of the turbine blade alloy by 30~150°C, thereby greatly improving the life and reliability of the engine. [0003] The development of preparation technology has ...

AI Technical Summary

Problems solved by technology

[0005] At present, there are generally two preheating methods in the process of preparing coatings by plasma physical vapor deposition. One is to use plasma jets to preheat directly. The wall thickness of each part of the complex workpiece is very different. During the heating process, the temperature difference between different parts of the same workpiece can reach 50-100 ℃. The temperature cannot meet the spraying requirements

The other is to use an external heating body such as a heating furnace for preheating. Limited by the size of the furnace body, the preheating cost for large and complex workpieces is high, and it is difficult for the heating body to heat the workpiece in a high vacuum environment in engineering practice.

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