Fusion reactor cooling pipe connection special solder for ultra-low temperature environment

Abstract

The invention belongs to brazing filler metal, and particularly relates to a special brazing filler metal for fusion reactor cooling pipe cryogenic environment, which comprises the following raw materials in parts by weight: 88.0 percent to 98.0 percent of copper, 0.5 percent to 5.0 percent of silicon, 0.5 percent to 10.0 percent of manganese, 0.1 percent to 5.0 percent of silver, 0.1 percent to 5.0 percent of tin or 0.1 percent to 5.0 percent of nickel. The special brazing filler metal has the advantages that the welding flux contains no high vapor pressure elements, the content of low melting point elements is below 5 percent, and the special brazing filler metal can be used for electric arc welding; and as the welding flux gives priority to copper, the melting temperature ranges from 980 DEG C to 1080 DEG C, while the melting temperature of welding flux for general electric arc welding ranges from 1400 DEG C to 1600 DEG C.

Description

Technical field [0001] The invention belongs to a solder, and in particular relates to a special solder for connecting a fusion reactor cooling pipe to an ultra-low temperature environment. Background technique [0002] The magnet support structure is one of the structures used by ITER. The ITER project (International Thermonuclear Experimental Reactor) is a new type of thermonuclear fusion experiment participated in by seven countries and regions including the European Union, the United States, China, Japan, Russia, India, and South Korea. Pile of items. In order to ensure the normal operation of the ITER superconducting coil, it is required that the temperature of the supporting part near the superconducting coil is not greater than 80K. It is necessary to install a cooling tube with high pressure and low temperature helium flow inside the magnet support. The connection between the cooling tube and the magnet support must have a good heat exchange efficiency, and the helium fl...

AI Technical Summary

Problems solved by technology

The main disadvantages of silver-based brazing filler metals in fusion reactor engineering are: under neutron irradiation conditions, the use of silver elements is limited; silver-based brazing filler metals contain Zn, and the boiling point of zinc elements is low, which is easy to produce when brazing is heated. Bubbles will affect the quality of the weld, and the vapor pressure of zinc is high, so it is easy to volatilize in a vacuum; silver-based solder needs to use a large amount of precious metal silver, and the cost is high

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