The effects of ball-milling treatment on the densification behavior of ultra-fine tungsten powder

2011 ◽  
Vol 29 (6) ◽  
pp. 743-750 ◽  
Author(s):  
Yong Han ◽  
Jinglian Fan ◽  
Tao Liu ◽  
Huichao Cheng ◽  
Jiamin Tian
Keyword(s):  
Ball Milling ◽  
Tungsten Powder ◽  
Densification Behavior ◽  
Fine Tungsten

The ball to powder ratio (BPR) dependent morphology and microstructure of tungsten powder refined by ball milling

2018 ◽  
Vol 339 ◽  
pp. 256-263 ◽  
Author(s):  
Z.M. Wu ◽  
Y.X. Liang ◽  
Y. Fan ◽  
P.P. Wang ◽  
J.L. Du ◽  
...  
Keyword(s):  
Ball Milling ◽  
Tungsten Powder

Thermodynamic Analysis of the Reduction of WO3 by Al Powder

2012 ◽  
Vol 581-582 ◽  
pp. 616-619
Author(s):  
Lian Ping Chen ◽  
Yuan Hong Gao ◽  
Bai Tao Su
Keyword(s):  
Gibbs Energy ◽  
Ball Milling ◽  
Thermodynamic Analysis ◽  
Room Temperature ◽  
Tungsten Powder ◽  
Tungsten Oxides ◽  
Al Powder

Hydrogen is widely used to prepare tungsten from tungsten oxides. Such a gas is combustible and strict measures must be taken. However, assisted by Mg or Li3N, tungsten can be prepared through the ball milling at room temperature. The reduction of WO3by Al powder is investigated thermodynamically. Simulations on the loss of Gibbs energy of these hypothetic reactions reveal that the reduction of WO3and WO2(OH)2(or H2WO4) is feasible when Al powder is used; and it is more difficult to generate the intermediate tungsten oxides such as WO2, WO2.72and WO2.9. In addition, it is better to prepare tungsten powder in vacuum containers in view of economy.

Production of Fine Tungsten Powder by Electrolytic Reduction of Solid CaWO4in Molten Salt

2012 ◽  
Vol 159 (6) ◽  
pp. E139-E143 ◽  
Author(s):  
Dingding Tang ◽  
Wei Xiao ◽  
Huayi Yin ◽  
Longfei Tian ◽  
Dihua Wang
Keyword(s):  
Molten Salt ◽  
Tungsten Powder ◽  
Electrolytic Reduction ◽  
Fine Tungsten

scholarly journals Effect of Ball Milling Parameters on the Refinement of Tungsten Powder

Metals ◽  
2018 ◽  
Vol 8 (4) ◽  
pp. 281 ◽  
Author(s):  
Zaoming Wu ◽  
Yanxia Liang ◽  
Engang Fu ◽  
Jinlong Du ◽  
Peipei Wang ◽  
...  
Keyword(s):  
Ball Milling ◽  
Tungsten Powder ◽  
Milling Parameters

Investigation of X-ray radiation effect on the structure and microhardness of tungsten powder filled composite

2018 ◽  
pp. 87-92
Author(s):  
A. A. Lozovan ◽  
F. E. Vilkov
Keyword(s):  
Radiation Resistance ◽  
Tungsten Powder ◽  
Absorbed Dose ◽  
Test Material ◽  
Simultaneous Increase ◽  
X Ray ◽  
Local Stresses ◽  
Before And After ◽  
Fine Tungsten ◽  
High Degree

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.

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