Journal
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
Volume 255, Issue -, Pages 8-16Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jmatprotec.2017.11.058
Keywords
Invar alloy; SiO2f/SiO2 composite; Tungsten interlayer; Interfacial microstructure; Shear strength
Funding
- National Natural Science Foundation of China [51522404, U1537206]
- Program for New Century Excellent Talents in University [NCET-12-0155]
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An AgCu-4.5 wt.%Ti/W/AgCu-1 wt.%Ti composite interlayer was designed to braze the Invar-SiO2f/SiO2 joints. Ti contents in the interlayer between the tungsten foil and the Invar alloy was optimized. The effects of the tungsten-foil thickness on the microstructure, elemental distribution and mechanical properties of the brazed Joints were investigated. Compared with a single AgCu-4.5 wt.%Ti interlayer, a sufficient metallurgical reaction happened on the SiO2f/SiO2 composite side and the formation of Fe2Ti, Ni3Ti compounds which are detrimental to the joint properties, was greatly inhibited by using a low-expansion composite interlayer (LECI). The tungsten interlayer can reduce the CTE (coefficient of thermal expansion) mismatch in the Invar-SiO2f/SiO2 joint. The highest shear strength of Joints brazed with an LECI was 33 MPa, which was 1.75 times higher than the joints brazed with a single AgCu-4.5 wt.%Ti interlayer.
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