SYNTHESIS OF NANOSIZED TUNGSTEN POWDER BY A THERMAL PLASMA PROCESS AND ITS SINTERING BEHAVIOR

被引：0

作者：

Ryu, Taegong ^{[1
]}

Hwang, Kyu Sup ^{[1
]}

Choi, Young Joon ^{[1
]}

Sohn, H. Y. ^{[1
]}

Fang, Zhigang Z. ^{[1
]}

机构：

[1] Univ Utah, Dept Met Engn, Salt Lake City, UT 84112 USA

来源：

EPD CONGRESS 2009, PROCEEDINGS | 2009年

关键词：

ammonium paratungstate; high energy ball-milling; nanopowder; sintering; tungsten powder; thermal plasma process;

D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Nanosized tungsten powder was synthesized by the hydrogen reduction of ammonium paratungstate (APT) in thermal plasma. The effects of operating conditions on the product composition and particle size were investigated. The particle size of synthesized W powder was less than 30 nm in all cases tested. The sintering behavior of the synthesized powder (25 nm average size) was then investigated and compared with those of commercial W powder of 500 nm average size and W powder of 23 nm average size produced by milling the commercial powder. The sintering was done at 1400 degrees C with various holding times. The hardness of the resulting compact from the synthesized W powder (315 VHN) was similar to that from the milled W powder (309 VHN), but the plasma-synthesized powder had a much lower tendency to form cracks. The compacts of both nanopowders were significantly harder than that of the commercial powder (192 VHN).

引用

页码：753 / 760

页数：8

共 11 条

[1] The tungsten powder study of the dispenser cathode [J].

Bao, JX ;

Wan, BF .

APPLIED SURFACE SCIENCE, 2006, 252 (16) :5873-5876

[2] Dynamic fracture of tungsten heavy alloys [J].

Bless, S. J. ;

Tarcza, K. ;

Chau, R. ;

Taleff, E. ;

Persad, C. .

INTERNATIONAL JOURNAL OF IMPACT ENGINEERING, 2006, 33 (1-12) :100-108

[3] LOW-TEMPERATURE CARBURIZATION OF HIGH-SURFACE-AREA TUNGSTEN POWDERS [J].

GAO, L ;

KEAR, BH .

NANOSTRUCTURED MATERIALS, 1995, 5 (05) :555-569

[4] Wet chemical process of rod-like tungsten nanopowders with iron (II) as reductive agent [J].

Gao, Ye ;

Zhao, Jingzhe ;

Zhu, Yanchao ;

Ma, Shanshan ;

Su, Xiaodan ;

Wang, Zichen .

MATERIALS LETTERS, 2006, 60 (29-30) :3903-3905

[5] Processing model for tungsten powders and extension to nanoscale size range [J].

German, RM ;

Ma, J ;

Wang, X ;

Olevsky, E .

POWDER METALLURGY, 2006, 49 (01) :19-27

[6]

Malewar R, 2007, J MATER RES, V22, P1200, DOI 10.1557/JMR.2007.0166

[7] Sintering behaviour of nanocrystalline titanium nitride powders [J].

Rabe, T ;

Wasche, R .

NANOSTRUCTURED MATERIALS, 1995, 6 (1-4) :357-360

[8] Reactive sintering of porous tungsten: A cost effective sustainable technique for the manufacturing of high current density cathodes to be used in flashlamps [J].

Selcuk, C ;

Wood, JV .

JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, 2005, 170 (1-2) :471-476

[9]

Upadhaya G.S., 1998, CEMENTED TUNGSTEN CA, P52

[10] Nanoengineering opens a new era for tungsten as well [J].

Wei, Q. ;

Ramesh, K. T. ;

Schuster, B. E. ;

Kecskes, L. J. ;

Dowding, R. J. .

JOM, 2006, 58 (09) :40-44

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