Spherical shape Ni-Co alloy powders directly prepared by spray pyrolysis

Hee Chan Jang, Seo Hee Ju, Yun Chan Kang

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Spherical shape Ni-Co alloy powders were directly prepared by spray pyrolysis in reduction atmosphere. The alloy powders prepared at temperatures of 1000 and 1200 °C had hollow structures and large sizes. On the other hand, the alloy powders prepared at a temperature of 1400 °C had dense structure and fine size. The mean size and geometric standard deviation of the powders prepared at a temperature of 1400 °C were 0.69 μm and 1.5. The BET surface area of the alloy powders prepared at a temperature of 1400 °C was 1.6 m2/g. The composition ratio of Ni and Co components were well coincided with that of the spray solution. The alloy powders had similar saturation magnetization (Ms) values irrespective of the preparation temperatures. However, the coercive force (Hc) values of the alloy powders decreased with increasing the preparation temperatures.

Original languageEnglish
Pages (from-to)206-209
Number of pages4
JournalJournal of Alloys and Compounds
Volume478
Issue number1-2
DOIs
Publication statusPublished - 2009 Jun 10
Externally publishedYes

Keywords

  • Ceramics
  • Chemical synthesis
  • Gas-solid reaction

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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