期刊
SCRIPTA MATERIALIA
卷 198, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2021.113833
关键词
Sintering; Joining; Direct bonding; Mechanical milling; Interface structure
类别
资金
- New Energy and Industrial Technology Development Organization (NEDO) [JPNP14004]
The Ag flake formed paste demonstrates high shear strength sinter-joining on bare Si, SiC, and GaN surfaces, due to its excellent sinter-joining ability and tight adhesion. The mechanical milling-acquired flakes can be rapidly sintered into a porous structure under low-temperature conditions, with drastic morphology reconstruction during sintering introducing robust interfacial connection structures. This promising sinter-joining material is suitable for high temperature applications involving the connection of bare surfaces.
In this work, we applied a Ag flake formed paste for sinter-joining on bare Si, SiC, and GaN surfaces. The sintered joints possess a high shear strength of over 40 MPa under a pressureless sintering condition at 250 degrees C. The high bonding strength of the joints is achieved by a tight adhesion between Ag and bare surfaces, which attributed to an excellent sinter-joining ability of the Ag flake. The flakes, acquired by mechanical milling, can be rapidly sintered into a homogenous porous structure at a pleasureless and low-temperature sintering condition due to its dislocation-rich nano grain structure. During sintering, a drastic morphology reconstruction of Ag flake, from a flattened flake to a drop-like particle, can introduce robust interfacial connection structures, which is important for the robust bonding. This Ag flake paste can be regarded as a promising sinter-joining material for the connection of bare surfaces in high temperature applications. (c) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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