Preparation and Characterization of Fibrous Copper Powder used for Conductive Filler
Abstract
A novel two-stage process is investigated for preparing the fibrous copper powder used for conductive filler in conductive paste. Based on thermodynamic simulation of Cu(II) — C2O4 2- -NH3 — NH4 + — H2O system, the rod-shape copper oxalate salt is synthesized firstly with coordination precipitation method, using ammonium oxalate and a purified copper salt solution which could be from either primary or secondary copper-bearing resources. According to the results of XRD, element analysis and X-ray single crystal diffraction, it can be inferred that the composition of the copper oxalate salt is [Cu(NH3)3]C2O4 • xH2O, and the NH3 plays a significant role in the formation of rod-shape crystal. Secondly, the copper oxalate salt is decomposed to fibrous copper powder at 350°C in inert atmosphere. The thermo-decomposition procedure is characterized by TG-DSC-FTIR, XRD and SEM. It is found that the phase of copper oxalate salt transforms as following: [Cu(NH3)3]C2O4 • xH2O→ [Cu(NH3)3]C2O4→ CuC2O4→Cu.
- Publication:
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REWAS 2013
- Pub Date:
- 2016
- DOI:
- 10.1007/978-3-319-48763-2_13
- Bibcode:
- 2016rewa.book..122F
- Keywords:
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- Materials Science