Investigation of chromium carbide/alumina nano-composite prepared via MOCVD in fluidized bed and densification process

Hao Tung Lin, Wei Sheng Huang, Sheng Chang Wang, Horng Hwa Lu, Wen Cheng J. Wei, Jow-Lay Huang

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Nano-sized Cr-species particles with a size about 20-40 nm, uniformly coated on alumina particles, has been prepared by metal organic chemical vapor deposition (MOCVD) in the fluidized chamber, using the pyrolysis of Cr(CO) 6 precursor. The Carbothermal reactions of Cr-species in an Ar atmosphere in a graphite furnace at 1250 °C for 2 h and the microstructure of high pressure sintering specimen are reported. The crystalline phase of the powder deposited in fluidized bed was characterized by an X-ray diffractometer, and transmission electron microscopy. The analysis indicates that the deposited powders were metastable CrC1-x and Cr2O3. These Cr-species were transferred into stable chromium carbide (Cr 3C2 and Cr7C3) after the thermal treatment as well as high pressure sintering. Microstructure of sintering specimen shows that the cluster of coating nano-particles were formed in the fluidized bed which coarsen during densification and generally located on the grain boundary to inhibit the alumina grain growth. Further, the independent coating nano-particle was also incorporated into the alumina grains.

Original languageEnglish
Pages (from-to)22-28
Number of pages7
JournalMaterials Science and Engineering B: Solid-State Materials for Advanced Technology
Volume127
Issue number1
DOIs
Publication statusPublished - 2006 Feb 15

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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