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

Fingerprint

chromium carbides
Organic Chemicals
Aluminum Oxide
Organic chemicals
Chromium
densification
Densification
Fluidized beds
metalorganic chemical vapor deposition
Carbides
beds
Chemical vapor deposition
Alumina
Sintering
aluminum oxides
Metals
Powders
sintering
composite materials
Composite materials

All Science Journal Classification (ASJC) codes

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

Cite this

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title = "Investigation of chromium carbide/alumina nano-composite prepared via MOCVD in fluidized bed and densification process",
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.",
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Investigation of chromium carbide/alumina nano-composite prepared via MOCVD in fluidized bed and densification process. / Lin, Hao Tung; Huang, Wei Sheng; Wang, Sheng Chang; Lu, Horng Hwa; Wei, Wen Cheng J.; Huang, Jow-Lay.

In: Materials Science and Engineering B: Solid-State Materials for Advanced Technology, Vol. 127, No. 1, 15.02.2006, p. 22-28.

Research output: Contribution to journalArticle

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AU - Lin, Hao Tung

AU - Huang, Wei Sheng

AU - Wang, Sheng Chang

AU - Lu, Horng Hwa

AU - Wei, Wen Cheng J.

AU - Huang, Jow-Lay

PY - 2006/2/15

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AB - 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.

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