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Active brazed Invar-SiO2f/SiO2 joint using a low-expansion composite interlayer.
- Source :
-
Journal of Materials Processing Technology . May2018, Vol. 255, p8-16. 9p. - Publication Year :
- 2018
-
Abstract
- An AgCu-4.5 wt.%Ti/W/AgCu-1 wt.%Ti composite interlayer was designed to braze the Invar-SiO 2f /SiO 2 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 SiO 2f /SiO 2 composite side and the formation of Fe 2 Ti, Ni 3 Ti 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-SiO 2f /SiO 2 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. [ABSTRACT FROM AUTHOR]
- Subjects :
- *COMPOSITE materials
*TITANIUM
*SILICA
*TUNGSTEN
*MICROSTRUCTURE
Subjects
Details
- Language :
- English
- ISSN :
- 09240136
- Volume :
- 255
- Database :
- Academic Search Index
- Journal :
- Journal of Materials Processing Technology
- Publication Type :
- Academic Journal
- Accession number :
- 128944479
- Full Text :
- https://doi.org/10.1016/j.jmatprotec.2017.11.058