Methods for preparing and spraying aluminum bronze powder containing dispersion-strengthening phase

Abstract

The invention relates to methods for preparing and spraying aluminum bronze powder containing a dispersion-strengthening phase. The method for preparing the aluminum bronze powder comprises the following steps: using aluminum oxide dispersion-strengthened copper powder and nanometer aluminum powder which are prepared by using an inner oxidizing method, as the raw materials; using a gluing agglomerating method to cover a layer of nanometer aluminum powder on the surface of the copper powder; and drying at a vacuum environment. The plasma spraying process is used in the method for spraying the aluminum bronze powder, wherein a spraying powder is controlled within 15-18KW and the powder feeding speed is 20-35g / min. According to the method provided by the invention, the aluminum bronze compound powder is prepared by covering the dispersion-strengthened copper powder with the nanometer aluminum powder. By using the dispersion-strengthened copper powder and the nanometer aluminum powder as the raw materials for agglomerating, the defect that the aluminum oxide dispersion-strengthened copper powder cannot be directly prepared is solved. By covering the copper powder with aluminum, the melting degree of the powder is increased by utilizing the heatproof reaction between copper and aluminum, thereby reducing the spraying power, reducing the growth of the aluminum oxide dispersion-strengthened grains and enhancing the dispersion-strengthening effect.

Description

technical field [0001] The invention relates to a method for preparing and spraying aluminum bronze powder containing a dispersion strengthening phase, and belongs to the field of aluminum bronze powder preparation and aluminum bronze powder spraying. Background technique [0002] The aluminum bronze material is a copper-aluminum binary alloy with an aluminum content of about 10%. In order to improve certain properties, elements such as iron, manganese, and nickel are often added to the binary aluminum bronze to form a multi-element aluminum bronze. Aluminum bronze has high strength, hardness and wear resistance, as well as good elasticity and corrosion resistance. It has become a new type of copper alloy widely used in modern industry. In addition to maintaining the above advantages, the aluminum bronze coating can also form a metallurgical bond with the steel substrate during the coating preparation process, so that the aluminum bronze coating can not only be used for mech...

AI Technical Summary

Problems solved by technology

[0004] The present invention solves the problem that oxidation cannot be controlled when the existing method is used for copper-aluminum alloys with an aluminum content as high as 10%, and an oxide film can only be formed on the surface of 10% copper-aluminum alloys, and a dispersed phase cannot be formed; during the spraying process, in order to Ensuring that the powder is fully melted, the spraying power is high, and the nano-scale dispersion strengthening particles are easy to grow, which weakens the effect of dispersion strengthening. A preparation of aluminum bronze powder containing a dispersion strengthening phase and the powder spraying method are provided.