Method for controlling atmospheric plasma spraying of easily-oxidized coating under atmosphere open environment

Abstract

The invention discloses a method for controlling atmospheric plasma spraying of an easily-oxidized coating under the atmosphere open environment. According to the method, in the plasma spraying process, powder can be effectively prevented from being oxidized, the purity and the property of the coating are ensured, the oxidation-resisting property and the ablation-resisting property of the coating are improved, and the service life of the coating is prolonged. The method specifically comprises the points that before plasma spraying is carried out, an air flow channel is arranged outside a plasma spraying gun muzzle; the air flow channel is connected with a protection air bottle, and therefore the aim that the protection atmosphere environment is formed between the spraying gun opening and a base material can be achieved. Before the coating is sprayed, the protection air bottle is opened in advance, the protection atmosphere environment is formed, and then plasma spraying equipment is controlled to carry out spraying of the easily-oxidized coating. According to the method, manufacturing of a silicide coating under the atmospheric pressure open environment can be achieved, the process is easy to operate, parameters are easy to regulate and control, and the method is a high-efficiency low-cost coating manufacturing process.

Description

technical field [0001] The invention relates to a method for preparing an easily oxidizable coating, in particular to a method for controlling an atmosphere plasma spraying an easily oxidizable coating in an open atmosphere environment, and belongs to the technical field of surface engineering. Background technique [0002] With the progress and development of current science and technology, the new generation of carrier aircraft has become the main development direction of aerospace with its main basic features of hypersonic speed, high maneuverability, and remote precise control, and will play an important role in future national security. . C / C composites have become a hot topic in the research of hypersonic vehicle materials in recent years because of their excellent properties such as high temperature strength, high thermal conductivity, low thermal expansion coefficient, low density, high temperature stability, and corrosion resistance. [0003] Borides have the advan...

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Problems solved by technology

The embedding method requires long-term diffusion at high temperature, the size of the sample is limited, and the properties of the substrate are prone to change; the composition of the coating prepared by chemical vapor deposition is limited, and the thickness of the surface coating is too thin; the coating formed by laser cladding is poor. , with many holes, it is not suitable for workpieces with complex shapes; the coating prepared by plasma spraying technology has the advantages of small substrate deformation, controllable coating composition in a wide range, easy control of thickness, and easy operation, etc. Under certain conditions, the powder is prone to oxidation, which affects the coating performance, and cannot be sprayed in the atmosphere, resulting in limited use of the environment

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