Reduction Behavior of Surface Oxide on Submicron Copper Particles for Pressureless Sintering Under Reducing Atmosphere

The reduction behavior of the surface oxide on Cu particles under a reducing gas atmosphere was investigated for a pressureless sinter joining. We conducted x-ray thermodiffraction analysis and simultaneous thermogravimetry, differential thermal analysis, and mass spectroscopy (TG–DTA–MS) under a re...

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Bibliographic Details
Published in:Journal of electronic materials 2022, Vol.51 (1), p.1-7
Main Authors: Matsuda, Tomoki, Yamagiwa, Daiki, Furusawa, Hideki, Sato, Kenji, Yashiro, Hisashi, Nagao, Keigo, Kim, Jungeun, Sano, Tomokazu, Kashiba, Yoshihiro, Hirose, Akio
Format: Article
Language:English
Subjects:
Brief Communication
Characterization and Evaluation of Materials
Chemistry and Materials Science
Copper
Differential thermal analysis
Differential thermogravimetric analysis
Electronics and Microelectronics
Instrumentation
Loose powder sintering
Materials Science
Nanoparticles
Optical and Electronic Materials
Oxygen
Reduction
Shear strength
Sintering
Solid State Physics
Thermogravimetry
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Summary:The reduction behavior of the surface oxide on Cu particles under a reducing gas atmosphere was investigated for a pressureless sinter joining. We conducted x-ray thermodiffraction analysis and simultaneous thermogravimetry, differential thermal analysis, and mass spectroscopy (TG–DTA–MS) under a reducing atmosphere to investigate the reduction and subsequent sintering behaviors of copper particles at different oxygen concentrations. The shear strength of the pressureless sinter joint decreased with increasing oxygen concentration. The thermodiffraction results revealed that the reduction onset of Cu 2 O started at the same temperature (220°C), whereas the reaction markedly persisted at higher oxygen concentrations. Cu sintering progressed significantly after the reduction due to generation of Cu nanoparticles. The TG–DTA–MS results indicated that H 2 O formation temperature associated with the reduction depends on the oxygen concentration, consistent with the thermodiffraction results. The surface oxides were found to play an important role in pressureless sinter joining via nanoparticle formation, while the presence of a large amount of oxide delayed the reduction and subsequent sintering.
ISSN:0361-5235
1543-186X
DOI:10.1007/s11664-021-09274-z