319
Views
12
Downloads
7
Crossref
N/A
WoS
9
Scopus
1
CSCD
Joining is a crucial process for the production of complex-shaped advanced engineering materials. Deep understanding of ceramic-metal interfaces during joining or following heat-treatment steps is therefore of important concern in designing the new systems. Capacitor discharge joining (CDJ) method was firstly carried out to compose the ceramic-metal joint material by silicon nitride (Si3N4)-titanium (Ti) constituents. Afterwards, heat treatment was performed on the Si3N4-Ti joints in air atmosphere at 1000 ℃ temperature to reveal the interface reactions and phases. Reaction layer that occurred between the Si3N4 and Ti interfaces and new phase formations were examined by transmission electron microscopy (TEM)-based various imaging and chemical analysis techniques. Electron transparent samples for TEM characterization were prepared by focused ion beam (FIB) milling and lifting method. Based on the detailed TEM results, Si and N diffusion arising from the Si3N4 ceramic was observed towards Ti metal foil side and further interacted with Ti atoms. The upshot of current diffusion was that Ti3N2 reaction layer with 50 nm thickness was formed at the interface while titanium silicon nitride (Ti6Si3N) matrix phase including dendritic-shaped Ti2N grains occurred in the Ti interlayer. It is believed that our TEM-based microscopy results not only provide the knowledge on ceramic-metal joint materials by CDJ method, but also contribute new insights on the development of various new joint systems.
Joining is a crucial process for the production of complex-shaped advanced engineering materials. Deep understanding of ceramic-metal interfaces during joining or following heat-treatment steps is therefore of important concern in designing the new systems. Capacitor discharge joining (CDJ) method was firstly carried out to compose the ceramic-metal joint material by silicon nitride (Si3N4)-titanium (Ti) constituents. Afterwards, heat treatment was performed on the Si3N4-Ti joints in air atmosphere at 1000 ℃ temperature to reveal the interface reactions and phases. Reaction layer that occurred between the Si3N4 and Ti interfaces and new phase formations were examined by transmission electron microscopy (TEM)-based various imaging and chemical analysis techniques. Electron transparent samples for TEM characterization were prepared by focused ion beam (FIB) milling and lifting method. Based on the detailed TEM results, Si and N diffusion arising from the Si3N4 ceramic was observed towards Ti metal foil side and further interacted with Ti atoms. The upshot of current diffusion was that Ti3N2 reaction layer with 50 nm thickness was formed at the interface while titanium silicon nitride (Ti6Si3N) matrix phase including dendritic-shaped Ti2N grains occurred in the Ti interlayer. It is believed that our TEM-based microscopy results not only provide the knowledge on ceramic-metal joint materials by CDJ method, but also contribute new insights on the development of various new joint systems.
The authors would like to thank to Anadolu University (Eskisehir, Turkey) for financial support by BAP-030217 project. We would like to also give our gratitude to UNAM Laboratories of Bilkent University (Ankara, Turkey) for FIB analysis.
Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made.
The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder.
To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.