Preparation of nickel and copper coated fine tungsten powder

The study focuses on the radiation resistance of a composite filled with fine tungsten powder having the 200–500 nm particle size. The studied composite is designed to provide radiation protection of electronic equipment. A sample with the test material was exposed to continuous spectrum X-ray radiation to an absorbed dose of 3 MGy. A characteristic of radiation resistance was sample microhardness measured before and after X-ray irradiation. Scanning electron microscopy was used to study the microstructure of a sample transverse cleavage after irradiation, and it was found that the sample had no visible defects in its structure. This result can be explained by uniform energy dispersion from local stresses due to high degree of composite filling with tungsten powder having a high thermal conductivity coefficient. The study of sample microhardness showed its 10 % increase attributable to the radiation hardening effect where increasing strength results in a simultaneous increase in microhardness. Experiments proved that this effect is manifested with an increase in the absorbed radiation dose.

Download Full-text

Fine Spherical Tungsten Powder Prepared by Precipitation Reaction

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.117-119.967 ◽

2011 ◽

Vol 117-119 ◽

pp. 967-970

Author(s):

Tao Lin ◽

Yan Jun Li ◽

Cheng Yi Wu ◽

Zhi Meng Guo

Keyword(s):

Particle Size ◽

Tungsten Powder ◽

Sodium Dodecyl ◽

Precipitation Reaction ◽

Mechanical Agitation ◽

Ammonium Tungstate ◽

Fine Tungsten ◽

Strong Acids ◽

Addition Amount ◽

Uniform Particle Size

The spherical tungsten powder was prepared by chemical reaction with ammonium tungstate and strong acids under ultrasonic and mechanical agitation. After precipitation reaction, the precipitate was dried and grinded, and then reduced into tungsten powder with hydrogen. The effects of acid kinds and dispersant on the fine tungsten powder were studied in this paper. The result shows that the acid kinds and its addition amount have great effect on the shape of tungsten particles. The tungsten powder with uniform particle size and spherical could be prepared by adding 17ml sulfric acid into 100ml ammonium tungstate. The tungsten particles can be finer and more dispersive, and have a spherical with addition of dispersant SDS (Sodium dodecyl sulfate). The particle size is about 1.5 micrometer.

Download Full-text

Influence of Ball-milling on Sintered Body Density of Fine Tungsten Powder

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/490/2/022073 ◽

2019 ◽

Vol 490 ◽

pp. 022073

Author(s):

Lingjie Duan ◽

Jinglian Fan

Keyword(s):

Ball Milling ◽

Tungsten Powder ◽

Sintered Body ◽

Body Density ◽

Fine Tungsten

Download Full-text

The Manufacture of Super-fine Tungsten Powder in Plasma

Proceedings of the 4th 2016 International Conference on Material Science and Engineering (ICMSE 2016) ◽

10.2991/icmse-16.2016.60 ◽

2016 ◽

Author(s):

Wei Huang ◽

Wen-Zhi Yang ◽

Wei-Ming Huang ◽

Zi-Ming Chen ◽

Fu-Jun Shang ◽

...

Keyword(s):

Tungsten Powder ◽

Fine Tungsten

Download Full-text

Transformation of the porous structure of fine tungsten powder compacts in the initial stages of sintering

Soviet Powder Metallurgy and Metal Ceramics ◽

10.1007/bf00794902 ◽

1991 ◽

Vol 30 (3) ◽

pp. 185-189

Author(s):

Yu. V. Gostev ◽

V. V. Panichkina ◽

I. L. Pasholok ◽

N. I. Filippov

Keyword(s):

Porous Structure ◽

Tungsten Powder ◽

Fine Tungsten ◽

Powder Compacts

Download Full-text

Fine Tungsten Powder Obtained with Blue Tungsten Oxide through the Hydrogen Reduction

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.727.72 ◽

2017 ◽

Vol 727 ◽

pp. 72-75 ◽

Cited By ~ 1

Author(s):

Xiao Ming Fu

Keyword(s):

Grain Size ◽

Tungsten Oxide ◽

Hydrogen Reduction ◽

Tungsten Powder ◽

Reduction Temperature ◽

Hydrogen Flow ◽

Ceramic Boat ◽

Particulate Size ◽

Fine Tungsten ◽

Scanning Electron

Fine tungsten powder is prepared with blue tungsten oxide (BTO) through the hydrogen reduction. The samples were characterized with the scanning electron microscope (SEM), fisher sub-sieve sizer (FSSS) and the particulate size description analyzer (PSDA). Fine tungsten powder is easily obtained when the reduction temperature is low. With the increasement of the reduction temperature, the grain size of tungsten powder becomes coarse. The increase of the weight of BTO in the ceramic boat leads to the increasement of the thickness of its bed. Therefore, the weight of BTO in the ceramic boat ought to reduce if fine tungsten powder is prepared. Fine tungsten powder can be obtained when the hydrogen flow increases.

Download Full-text