On the synthesis of Bi - based precursors for lead - free solders development

V. Gandova, K. Lilova, H. Malakova, B. Huber, N. Milcheva, H. Ipser, J. Vrestal, G. Vassilev

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Preliminary studies on the design of lead-free solders precursors by wet chemistry methods are presented. The main objective is to assess the impact of the way of hydroxide precipitates preparation on the metal elements content of the precipitates. Namely, ternary hydroxide mixtures of three systems: a. Cu(II), Bi(III), Sn(II); b. Cu(II), Bi(III), Sb(III); and c. Cu(II), Bi(III), Zn(II) were prepared, firstly, by single-element precipitation and, secondly, by co-precipitation. Thereafter, all mixtures were reduced by using hydrogen gas. Both, the initial mixtures and the reduced samples were studied by X-ray diffraction, optical and scanning electron microscopes. The chemical compositions of the precipitates were determined experimentally and their dependence on the pH was verified. It was found that alloying occurred during the reduction procedure, but in some cases the reduction was not complete (i.e. oxide phases rest in the samples). This might be a huge obstacle to use such an approach for the preparation of lead-free solders. Moreover, the materials obtained after reductions apparently are bulk alloys, thus, the preparation of small-sized metal particles would be a challenge. Another key feature to be addressed in future studies is the correlation between the chemical compositions of the parent solution and these of the corresponding precipitates.

Original languageEnglish (US)
Pages (from-to)11-23
Number of pages13
JournalJournal of Mining and Metallurgy, Section B: Metallurgy
Volume46
Issue number1
DOIs
StatePublished - 2010

Keywords

  • Co-precipitation
  • Cu-Bi-Sb
  • Cu-Bi-Sn
  • Cu-Bi-Zn
  • Hydroxide mixtures
  • Lead-free solders precursors
  • Precipitation
  • Reduction
  • Ternary systems

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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