Journal
CERAMICS INTERNATIONAL
Volume 42, Issue 6, Pages 7080-7087Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2016.01.096
Keywords
Si3N4 ceramic; Brazing; Finite element simulation; Residual stress
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Funding
- National Natural Science Foundation of China [50975064, 51321061, 51372049]
- China Scholarship Council
- Empa-Swiss Federal Laboratories for Materials Science and Technology
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An Ag-Cu-Ti+TiNp/Cu/Ag-Cu three-layered filler was designed to braze Si3N4 ceramic and Invar alloy. The effect of the Cu-foil thickness on the microstructure and the mechanical properties of the brazed joints was investigated. Compared with single-layer Ag-Cu-Ti+TiNp filler, the formation of Fe2Ti and Ni3Ti compounds is widely inhibited by using multi-layered filler. The shear strength of the brazed joint is 47.9% higher than that of joints brazed with single Ag-Cu-Ti+TiNp filler when a 200 mu m thick Cu interlayer is used. A simplified unit cell model was designed to obtain the physical properties of the TiNp reinforced filler. The model provides the elastic modulus and yield stress that satisfy the Hashin-Shtrikman bounds and N. Ramalcrishnan's equations, respectively. In the three-layered brazing, the finite element (FE) model shows that system residual stresses decrease significantly by increasing the thickness of Cu foil in the multi-layered system. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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