A modified plasma arc gas condensation technique to synthesize nanocrystalline tungsten oxide powders

Cherng Yuh Su, Chung Kwei Lin, Chia Wei Cheng

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

In the present study, nanocrystalline tungsten oxide powders were prepared by a modified plasma arc gas condensation technique where a gas nozzle was introduced to provide blowing gas. With the aid of the blowing gases, nanocrystalline tungsten oxide powders can be prepared under various chamber pressures ranged from 4.9 to 101.3kPa. The mean grain size and powder production rate of the as-prepared nanocrystalline WO3 powders increased with increasing chamber pressure. For an increasing chamber pressure from 4.9 to 101.3 kPa, asignificant increase in powder production rate from 0.374 to 13.658 g/h can be noticed, while the mean grain size only enlarged acceptably from 5.9 to 15.7 nm. Meanwhile, by controlling the partial oxygen pressure of the mixed gas, nanocrystalline blue tungsten oxide powders can be prepared successfully. The blowing mixed gas from the nozzle not only suppressed the nucleation and growth for powders from the gas phase, but can be used to prepare stoichiometric or nonstoichiometric tungsten oxide powders.

Original languageEnglish
Pages (from-to)1016-1020
Number of pages5
JournalMaterials Transactions
Volume46
Issue number5
DOIs
Publication statusPublished - May 2005
Externally publishedYes

Fingerprint

tungsten oxides
Powders
plasma jets
Tungsten
Condensation
condensation
Gases
Plasmas
Oxides
gases
pressure chambers
Blow molding
blowing
Nozzles
nozzles
grain size
Nanocrystalline powders
tungsten oxide
Nucleation
Oxygen

Keywords

  • Nanocrystalline WO powders
  • Nonstoichiometric tungsten oxide
  • Plasma arc gas condensation technique

ASJC Scopus subject areas

  • Materials Science(all)
  • Metals and Alloys

Cite this

A modified plasma arc gas condensation technique to synthesize nanocrystalline tungsten oxide powders. / Su, Cherng Yuh; Lin, Chung Kwei; Cheng, Chia Wei.

In: Materials Transactions, Vol. 46, No. 5, 05.2005, p. 1016-1020.

Research output: Contribution to journalArticle

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N2 - In the present study, nanocrystalline tungsten oxide powders were prepared by a modified plasma arc gas condensation technique where a gas nozzle was introduced to provide blowing gas. With the aid of the blowing gases, nanocrystalline tungsten oxide powders can be prepared under various chamber pressures ranged from 4.9 to 101.3kPa. The mean grain size and powder production rate of the as-prepared nanocrystalline WO3 powders increased with increasing chamber pressure. For an increasing chamber pressure from 4.9 to 101.3 kPa, asignificant increase in powder production rate from 0.374 to 13.658 g/h can be noticed, while the mean grain size only enlarged acceptably from 5.9 to 15.7 nm. Meanwhile, by controlling the partial oxygen pressure of the mixed gas, nanocrystalline blue tungsten oxide powders can be prepared successfully. The blowing mixed gas from the nozzle not only suppressed the nucleation and growth for powders from the gas phase, but can be used to prepare stoichiometric or nonstoichiometric tungsten oxide powders.

AB - In the present study, nanocrystalline tungsten oxide powders were prepared by a modified plasma arc gas condensation technique where a gas nozzle was introduced to provide blowing gas. With the aid of the blowing gases, nanocrystalline tungsten oxide powders can be prepared under various chamber pressures ranged from 4.9 to 101.3kPa. The mean grain size and powder production rate of the as-prepared nanocrystalline WO3 powders increased with increasing chamber pressure. For an increasing chamber pressure from 4.9 to 101.3 kPa, asignificant increase in powder production rate from 0.374 to 13.658 g/h can be noticed, while the mean grain size only enlarged acceptably from 5.9 to 15.7 nm. Meanwhile, by controlling the partial oxygen pressure of the mixed gas, nanocrystalline blue tungsten oxide powders can be prepared successfully. The blowing mixed gas from the nozzle not only suppressed the nucleation and growth for powders from the gas phase, but can be used to prepare stoichiometric or nonstoichiometric tungsten oxide powders.

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