Study of color change and microstructure development of Al 2O3-Cr2O3/Cr3C 2 nanocomposites prepared by spark plasma sintering

Hao Tung Lin, Bo Zon Liu, Wei Hsio Chen, Jow Lay Huang, Pramoda K. Nayak

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

The densification behaviors of Al2O3-Cr 2O3/Cr3C2 nanocomposites prepared by a Spark Plasma Sintering (SPS) were investigated in this work. The initial powders used for sintering were Al2O3-Cr2O 3, which were prepared by metal organic chemical vapor deposition (MOCVD) in a spout bed. Different colors of the compacts such as green, purple and black were observed after densification process at different SPS temperatures from 1200 °C to 1350 °C. These changes of color were relevant to the existence of secondary phase of green Cr2O 3, pink solid solution of Cr2O3-Al 2O3 and black Cr3C2, which were formed under the different SPS temperature. The secondary phase of Cr 2O3 retarded the processing of densification for spark plasma sintering at 1200 °C. The Cr2O3 reacted with Al2O3 to form solid solution of Cr2O 3-Al2O3 and with carbon to form Cr 3C2 as sintering temperature increased to 1350 °C. The characteristics of high heating rate, shorter sintering time for SPS and the formation of secondary phase of Cr3C2 effectively reduced the substrate's grain growth, making Al2O3-Cr 2O3/Cr3C2 nanocomposites with small grain size.

Original languageEnglish
Pages (from-to)2081-2087
Number of pages7
JournalCeramics International
Volume37
Issue number7
DOIs
Publication statusPublished - 2011 Sep 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

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