Uniform preheating method of complex molded surface workpiece for PS-PVD

Abstract

The invention discloses a uniform preheating method for a complex molded surface workpiece for PS-PVD, and aims to solve the technical problems that a complex molded surface workpiece is difficult to uniformly preheat by adopting a traditional high-energy beam jet flow, and the operation is difficult and the cost is high in engineering practice by adopting an external heating body for heating. A work piece heating device is designed and three anode plates are arranged around a workpiece; arc striking is carried out before spraying, so that a spray gun cathode and the three anode plates in a preheating system generate transfer ion arcs, and the high temperature of the multiple transfer ion arcs and the anode plates is adopted to carry out uniform radiation heating on a complex molded surface workpiece. In-situ uniform heating of the surfaces of workpieces with complex shapes and different sizes can be achieved before spraying, the uniformity of coatings on the surfaces of the workpieces is improved, and the production cost is greatly reduced.

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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