Diffusion bonding method for high-temperature alloy and oxygen-free copper annular part

Abstract

The invention provides a diffusion bonding method for a high-temperature alloy and oxygen-free copper annular part. The diffusion bonding method comprises the steps of preparation of the annular part,preparation of a sleeve, assembly, hot isostatic pressing pretreatment, hot isostatic pressing process control and post-processing. According to the diffusion bonding method for the high-temperaturealloy and oxygen-free copper annular part, the hot isostatic pressure diffusion bonding technology is adopted, the oxygen-free copper and the high-temperature alloy annular part form diffusion bondingunder the condition of high temperature and high pressure, and the high-temperature alloy and oxygen-free copper annular part is formed. According to the diffusion bonding method for the high-temperature alloy and oxygen-free copper annular part, the problems of spalling, block dropping and delamination of a connecting layer and the problem of matrix separation are avoided, the porosity of the connecting layer is reduced, and good metallurgical bonding is achieved.

Description

technical field [0001] The invention belongs to the field of aerospace manufacturing, and in particular relates to the aspect of diffusion connection between a superalloy and an oxygen-free copper ring. Background technique [0002] High-temperature alloys have excellent high-temperature strength, good oxidation resistance, thermal corrosion resistance, creep resistance, fatigue performance, fracture toughness and other comprehensive properties, and are widely used in the aerospace field. In recent years, a large number of high-temperature alloys with low expansion coefficients have been selected in China to make annular parts for turbine engines, such as high-pressure compressor rear casings, bearing rings, heat insulation rings, combustion chamber sealing rings, honeycomb seats and Turbine outer ring, etc.; and rocket engine thrust combustor, exhaust duct and header box, etc. [0003] When connecting dissimilar materials between superalloys and oxygen-free copper, using t...

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Problems solved by technology

[0003] When connecting dissimilar materials between superalloys and oxygen-free copper, using traditional welding, brazing, and direct diffusion welding methods, there are problems with the connection layer peeling, falling off, delamination and separation from the substrate, and the connection layer has a high porosity

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