Investigation of the Microstructure and Mechanical Properties of Brazing Joints between Niobium and 316L Stainless Steel using Silver-Copper-Palladium Filler

• Autorzy: Wang Ruoxu , Liu Lubei , Xue Zongheng , Tan Teng

Identyfikatory

DOI

10.24425/amm.2023.146232

• Języki publikacji: EN

Abstrakty

EN

This paper introduces an approach for vacuum brazing of niobium-316L stainless steel transition joints for application in superconducting radiofrequency cavity helium jackets. The study takes advantage of good wettability of Ag-Cu-Pd brazing alloy to suppress brittle Fe-Nb intermetallic formation, hence improve the joints’ mechanical performance. The wettability of Ag-Cu-Pd filler metal on niobium, the interface microstructure and mechanical properties of the transition joints were investigated. Two kinds of Ag-Cu-Pd filler metals had been studied and wet well on the niobium, and the wettability of Ag-31.5Cu-10Pd filler metal on niobium was better than Ag-28Cu-20Pd filler metal. Microstructure characterization demonstrated the absence of brittle intermetallic layers in all of the joint interfaces. Mechanical properties of samples prepared with Ag-31.5Cu-10Pd filler metal were also better than their peers made with Ag-28Cu-20Pd filler metal both room temperature (300 K) and liquid nitrogen temperature (77 K). The transition joints displayed shear strengths of 356-375 MPa at 300 K and 440-457 MPa at 77 K, respectively. After undergoing ten thermal cycles between the room temperature and the liquid nitrogen temperature, the transition joints’ leak rates were all lower than 1.1×10^-11mbar·L/s. Therefore, Ag-Cu-Pd filler metal is applicable to high vacuum vessels used at cryogenic temperatures.

Słowa kluczowe

EN

Ag-Cu-Pd brazing alloy; niobium; vacuum brazing; 316L stainless steel; SRF cavities

• Wydawca: Institute of Metallurgy and Materials Science of Polish Academy of Sciences ; Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences
• Czasopismo: Archives of Metallurgy and Materials
• Rocznik: 2023
• Tom: Vol. 68, iss. 4
• Strony: 1623--1632
• Opis fizyczny: Bibliogr. 24 poz., fot., rys., tab.

Twórcy

autor

Wang Ruoxu

• Chinese Academy of Sciences, Institute of Modern Physics, Lanzhou, Gansu 730000, China
• The Advanced Energy Science and Technology Guangdong Laboratory, Huizhou, Guangdong 516000, China
• Anhui East China Photoelectric Technology Research Institute, Wuhu, Anhui 241002, China

autor

Liu Lubei

• Chinese Academy of Sciences, Institute of Modern Physics, Lanzhou, Gansu 730000, China
• The Advanced Energy Science and Technology Guangdong Laboratory, Huizhou, Guangdong 516000, China

autor

Xue Zongheng

• Chinese Academy of Sciences, Institute of Modern Physics, Lanzhou, Gansu 730000, China
• The Advanced Energy Science and Technology Guangdong Laboratory, Huizhou, Guangdong 516000, China

autor

Tan Teng

• Chinese Academy of Sciences, Institute of Modern Physics, Lanzhou, Gansu 730000, China
• The Advanced Energy Science and Technology Guangdong Laboratory, Huizhou, Guangdong 516000, China

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Uwagi

1. The present work was supported by National Natural Science Foundation of China (Grant No. 12075295).

2. Opracowanie rekordu ze środków MNiSW, umowa nr POPUL/SP/0154/2024/02 w ramach programu "Społeczna odpowiedzialność nauki II" - moduł: Popularyzacja nauki (2025)