Effect of pre-reduced Cu particles on hydrogen-reduction of W-oxide in WO3-CuO powder mixtures

Dae Gun Kim; Kyung Ho Min; Si Young Chang; Sung Tag Oh; Chang Hee Lee; Young Do Kim

doi:10.1016/j.msea.2005.04.010

Effect of pre-reduced Cu particles on hydrogen-reduction of W-oxide in WO₃-CuO powder mixtures

Dae Gun Kim, Kyung Ho Min, Si Young Chang, Sung Tag Oh, Chang Hee Lee, Young Do Kim

Dept. of Materials Science & Engineering

Research output: Contribution to journal › Article › peer-review

50 Scopus citations

Abstract

The hydrogen-reduction behavior of W-oxides in ball-milled powder mixtures of W- and Cu-oxides was investigated by microstructural analysis and humidity change measurement in the reduction process. The refinement and homogeneous mixing of powders by the ball-milling process induced a decrease in hydrogen-reduction temperature of W-oxides and the resultant refinement of W particle size. In addition, it is suggested that the surface of previously hydrogen-reduced Cu particles acted as a nucleation site to be W particles by reduction including chemical vapor transport process of WO₂ in hydrogen atmosphere. Decrease in reduction temperature of W-oxides in powder mixture was explained by the attribution of Cu particles in the hydrogen-reduction of WO₂.

Original language	English
Pages (from-to)	326-331
Number of pages	6
Journal	Materials Science and Engineering: A
Volume	399
Issue number	1-2
DOIs	https://doi.org/10.1016/j.msea.2005.04.010
State	Published - 15 Jun 2005

Keywords

Chemical vapor transport
Hydrogen reduction
Microstructure
W-Cu nanocomposite

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10.1016/j.msea.2005.04.010

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title = "Effect of pre-reduced Cu particles on hydrogen-reduction of W-oxide in WO3-CuO powder mixtures",

abstract = "The hydrogen-reduction behavior of W-oxides in ball-milled powder mixtures of W- and Cu-oxides was investigated by microstructural analysis and humidity change measurement in the reduction process. The refinement and homogeneous mixing of powders by the ball-milling process induced a decrease in hydrogen-reduction temperature of W-oxides and the resultant refinement of W particle size. In addition, it is suggested that the surface of previously hydrogen-reduced Cu particles acted as a nucleation site to be W particles by reduction including chemical vapor transport process of WO2 in hydrogen atmosphere. Decrease in reduction temperature of W-oxides in powder mixture was explained by the attribution of Cu particles in the hydrogen-reduction of WO2.",

keywords = "Chemical vapor transport, Hydrogen reduction, Microstructure, W-Cu nanocomposite",

author = "Kim, \{Dae Gun\} and Min, \{Kyung Ho\} and Chang, \{Si Young\} and Oh, \{Sung Tag\} and Lee, \{Chang Hee\} and Kim, \{Young Do\}",

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doi = "10.1016/j.msea.2005.04.010",

language = "English",

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journal = "Materials Science and Engineering: A",

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TY - JOUR

T1 - Effect of pre-reduced Cu particles on hydrogen-reduction of W-oxide in WO3-CuO powder mixtures

AU - Kim, Dae Gun

AU - Min, Kyung Ho

AU - Chang, Si Young

AU - Oh, Sung Tag

AU - Lee, Chang Hee

AU - Kim, Young Do

PY - 2005/6/15

Y1 - 2005/6/15

N2 - The hydrogen-reduction behavior of W-oxides in ball-milled powder mixtures of W- and Cu-oxides was investigated by microstructural analysis and humidity change measurement in the reduction process. The refinement and homogeneous mixing of powders by the ball-milling process induced a decrease in hydrogen-reduction temperature of W-oxides and the resultant refinement of W particle size. In addition, it is suggested that the surface of previously hydrogen-reduced Cu particles acted as a nucleation site to be W particles by reduction including chemical vapor transport process of WO2 in hydrogen atmosphere. Decrease in reduction temperature of W-oxides in powder mixture was explained by the attribution of Cu particles in the hydrogen-reduction of WO2.

AB - The hydrogen-reduction behavior of W-oxides in ball-milled powder mixtures of W- and Cu-oxides was investigated by microstructural analysis and humidity change measurement in the reduction process. The refinement and homogeneous mixing of powders by the ball-milling process induced a decrease in hydrogen-reduction temperature of W-oxides and the resultant refinement of W particle size. In addition, it is suggested that the surface of previously hydrogen-reduced Cu particles acted as a nucleation site to be W particles by reduction including chemical vapor transport process of WO2 in hydrogen atmosphere. Decrease in reduction temperature of W-oxides in powder mixture was explained by the attribution of Cu particles in the hydrogen-reduction of WO2.

KW - Chemical vapor transport

KW - Hydrogen reduction

KW - Microstructure

KW - W-Cu nanocomposite

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U2 - 10.1016/j.msea.2005.04.010

DO - 10.1016/j.msea.2005.04.010

M3 - Article

AN - SCOPUS:23344438303

SN - 0921-5093

VL - 399

SP - 326

EP - 331

JO - Materials Science and Engineering: A

JF - Materials Science and Engineering: A

IS - 1-2

ER -

Effect of pre-reduced Cu particles on hydrogen-reduction of W-oxide in WO₃-CuO powder mixtures

Abstract

Keywords

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