Method for printing combustion chamber lining by using GRCop-42 spherical powder

Abstract

The invention discloses a method for printing a combustion chamber lining by using GRCop-42 spherical powder. The GRCop-42 alloy spherical powder comprises the following chemical components in percentage by weight: 2-4wt% of Cu, 2-4wt% of Cr and Nb. The method comprises the following steps of: 1) heating the spherical powder in vacuum, cooling the spherical powder along with a furnace, then performing ultrasonic vibration, screening the spherical powder and preparing to discharge the spherical powder into the furnace; 2) establishing a process model of a part, and slicing the model in layers to form a laser scanning path of each layer; 3) setting process parameters of powder laying and printing equipment, placing a rear bottom plate substrate, and fully laying the GRCop-42 spherical powderin a powder cylinder; 4) starting the equipment and starting printing and forming; 5) after laser scans one layer, descending a forming cylinder by one layer, then ascending the powder cylinder by one layer, laying a layer of copper powder on the processed layer surface by using the powder in the powder cylinder through a scraper, then descending the powder cylinder, and repeating the steps on each layer until the printing of the structure is finished; 6) performing annealing treatment; and 7) cutting and separating the structure from the substrate, and performing sand blasting on the surfaceof the structure. The method solves the problem of domestic application of advanced materials, and meets the preparation requirement of an aerospace copper alloy structure.

Description

technical field [0001] The invention relates to the technical field of metallurgical manufacturing of metal additive manufacturing, in particular to a method for printing combustion chamber lining with GRCop-42 spherical powder. Background technique [0002] NASA collaborated with Glenn Research Center (GRC) and Marshall Space Flight Center (MSFC) to develop a high-conductivity high-strength copper alloy GRCop-42, and successfully printed it using powder bed fusion (PBF) additive manufacturing technology. The fully dense GRCop-42 components can realize that it is not easy to deform under high temperature environment. NASA has further developed GRCop-42 copper alloy additive manufacturing technology, and components 3D printed with GRCop-42 material cool faster, which can achieve higher thermal conductivity while maintaining the same strength. The NASA researchers then performed an additive manufacturing post-processing through a hot isostatic press (HIP), which reduces the m...

AI Technical Summary

Problems solved by technology

As early as the 1980s, foreign countries have carried out research on the process performance of Narloy-Z inner wall materials, which have been widely used in mature models such as 100-ton hydrogen-oxygen engines. GRCop-84 materials have been infinitely close to use, and GRCop-42 has also been used from small parts The verification stage is applied to large parts of the service level; the inner wall material of the hydrogen-oxygen engine in my country has developed from the early stainless steel to the current Amzirc alloy, and the Amzirc inner wall material has been applied to mature models, but generally speaking, it is not as good as the engine performance of the international aerospace power There is still a big gap in the development and application research of inner wall materials