| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 7976571 | Materials Science and Engineering: A | 2016 | 29 Pages |
Abstract
Ag-Cu-Ti+TiNp composite filler was developed to braze Si3N4 ceramic to Invar alloy, and subsequently the effect of TiNp content on the microstructure and mechanical properties of the joints was investigated. The typical microstructure of the brazed joints is Si3N4/TiN+Ti2N+TiSi+Fe2Ti/Ag(s.s)+Cu(s.s)+TiNp/wavelike Fe2Ti+Ni3Ti/Ag-Cu eutectic/Invar alloy. With the increase of TiNp content, the reaction layers near the Si3N4 become thinner, and Ag-Cu eutectic appears less and finer between the ceramic and wavelike intermetallics. The maximum shear strength increases from 63Â MPa to 229Â MPa with the optimum TiNp content of 2Â vol%, compared with the case without TiNp. The hardness and elastic modulus of the reaction phases were characterized by nanoindentation to reveal the strengthen of brazing seam. The following reasons are believed to strengthen the brazed joint: the thermal expansion coefficient (CTE) reduction of the composite filler, appropriate thickness of the Si3N4/braze reaction layer, the strengthen of the braze.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Tianpeng Wang, Chunfeng Liu, Christian Leinenbach, Jie Zhang,