Low temperature sintering-bonding through in-situ formation of Ag nanoparticles using micro-scaled Ag2O composite paste

Fengwen Mu, Guisheng Zou, Zhenyu Zhao, Aiping Wu, Jiuchun Yan, Y. Norman Zhou

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

In order to reduce the cost of using Ag nanoparticle paste as bonding materials in electronic packaging, micro-scaled Ag2O powders were mixed with triethylene glycol (TEG) to form a paste to replace the Ag particle paste. The reaction mechanism of in-situ formation of Ag nanoparticles, the sintering characteristics of micro-Ag2O paste at low temperature, and the bonding of Ag-coated Cu bulks using this paste were investigated. The results reveal that the Ag2O particles in the paste were more easily transformed into Ag nanoparticles than micro-Ag2O itself, and with increasing the sintering temperature, more Ag nanoparticles formed and grew larger by sintering, accompanied with some gaseous products which could escape easily. The effect of sintering-bonding time on the strength of joints fabricated at 250°C under a pressure of 2 MPa was analyzed. The average shear strength of the joints increased with sintering-bonding time and reached about 24 MPa when the sintering-bonding time was 5 min. And the microstructure of the fractured surface and the cross-section of typical joints made at 250°C under 2 MPa were also examined.

Original languageEnglish
Pages (from-to)38-42
Number of pages5
JournalHanjie Xuebao/Transactions of the China Welding Institution
Volume34
Issue number4
Publication statusPublished - 2013 Apr 1
Externally publishedYes

Keywords

  • Ag nanopartcles
  • In-situ formation
  • Silver oxide
  • Sintering bonding

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering

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