Fine Cemented Carbide Particles Prepared with Activated Tungsten Oxide

2012 ◽  
Vol 510 ◽  
pp. 619-622
Author(s):  
Xiao Ming Fu
Keyword(s):  
Particle Size ◽  
Electron Microscope ◽  
Tungsten Carbide ◽  
Tungsten Oxide ◽  
Experimental Results ◽  
Cemented Carbide ◽  
Carbide Particles ◽  
Better Than ◽  
And Tungsten

Fine cemented carbide in the diameter of less than 1 μm is obtained activated tungsten oxide. The samples are characterized by laser particle size analyze, electron microscope and sclerometer. The experimental results show that the size of tungsten particles and tungsten carbide prepared with activated tungsten becomes small remarkably, and coarse tungsten particles decrease. The properties of cemented carbide prepared with activated tungsten oxide are better than those of cemented carbide made with blue tungsten oxide. Especially, the hardness of cemented carbide prepared with activated tungsten oxide increases by about 7 %.

scholarly journals ZnWO4 Nanoparticle Scintillators for High Resolution X-ray Imaging

Nanomaterials ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1721
Author(s):  
Heon Yong Jeong ◽  
Hyung San Lim ◽  
Ju Hyuk Lee ◽  
Jun Heo ◽  
Hyun Nam Kim ◽  
...  
Keyword(s):  
Particle Size ◽  
Zinc Oxide ◽  
High Resolution ◽  
Tungsten Oxide ◽  
Spatial Resolution ◽  
High Spatial Resolution ◽  
X Ray ◽  
X Ray Imaging ◽  
Average Size ◽  
And Tungsten

The effect of scintillator particle size on high-resolution X-ray imaging was studied using zinc tungstate (ZnWO4) particles. The ZnWO4 particles were fabricated through a solid-state reaction between zinc oxide and tungsten oxide at various temperatures, producing particles with average sizes of 176.4 nm, 626.7 nm, and 2.127 μm; the zinc oxide and tungsten oxide were created using anodization. The spatial resolutions of high-resolution X-ray images, obtained from utilizing the fabricated particles, were determined: particles with the average size of 176.4 nm produced the highest spatial resolution. The results demonstrate that high spatial resolution can be obtained from ZnWO4 nanoparticle scintillators that minimize optical diffusion by having a particle size that is smaller than the emission wavelength.

Simulation Analysis of Penetration Performance of Tungsten Alloy and Tungsten Carbide Rod Penetrator

2012 ◽  
Vol 182-183 ◽  
pp. 283-287
Author(s):  
Qun Biao Wu ◽  
Pei Hui Shen ◽  
Rong Zhong Liu
Keyword(s):  
Tungsten Carbide ◽  
Simulation Analysis ◽  
Tungsten Alloy ◽  
Distinct Advantage ◽  
Penetration Mechanics ◽  
Armor Steel ◽  
The One ◽  
The Impact ◽  
Better Than ◽  
And Tungsten

In penetration mechanics, the material parameters of the rod penetrator are very important factors which influence the effect of penetration. The effect of each parameter changes with the impact velocity. Simulation analysis of two models filled with tungsten alloy and tungsten carbide separately penetrating semi-infinite armor steel target at medium to high velocities has been made to quantitatively analyze the key roles that the density and hardness play. Simulation results indicate that a dividing line of velocity exists between the penetrations of two materials. Above the line, tungsten alloy rod with greater density has a distinct advantage with increasing velocity. Below the line, the advantage of tungsten carbide rod with greater hardness is significantly more with the decreasing velocity. In the process of penetration, penetration velocity decreases rapidly from a high value to zero. The simulation result provides quantitative analytic basis which can be used to prove that the penetrator composed of two different materials is better than the one composed of homogenous material.

Structure–performance relations of molybdenum- and tungsten carbide catalysts for deoxygenation

2015 ◽  
Vol 17 (1) ◽  
pp. 582-593 ◽  
Author(s):  
Daniel R. Stellwagen ◽  
Johannes H. Bitter
Keyword(s):  
Particle Size ◽  
Tungsten Carbide ◽  
Large Particle ◽  
Molybdenum Carbide ◽  
Large Particle Size ◽  
And Tungsten

Tungsten- and molybdenum carbide catalysts of large particle size improve activity, stability and selectivity of the catalyst in (hydro)deoxygenation reactions.

Processing of WC-Co Cemented Carbide Balls by Rotated Dual-Plates Lapping Machine

2009 ◽  
Vol 69-70 ◽  
pp. 277-281
Author(s):  
De Sheng Chen ◽  
Fan Yang ◽  
K.F. Tang ◽  
Jia Jie Chen ◽  
Ju Long Yuan ◽  
...  
Keyword(s):  
Processing Parameters ◽  
Batch Processing ◽  
Final Demand ◽  
Experimental Results ◽  
Cemented Carbide ◽  
Abrasive Grain ◽  
Ball Surface ◽  
Lapping Machine ◽  
Better Than

In this paper, the batch processing of Φ35mm WC-Co cemented carbide balls used in one-way value is studied by rotated dual-plates (RDP) lapping machine. On the basis of this innovated equipment, the processing parameters, including abrasive grain, rotating velocity and load, are changed legitimately in experiment. The experimental results show that the abrasive grain is used from big to small, while the rotating velocity and load are gradually reduced in order to improve the uniformity of lapping trace distribution on the ball surface in batch processing. Finally the rational course and parameters are defined, these WC-Co cemented carbide balls satisfy the products’ final demand which means the sphericity error (Rnd) is less than 1μm and the roughness of surface (Ra) is better than 50nm. Because of the feasibility, the precision of final WC-Co cemented carbide balls improves and can be applied in one-way value used in oil exactor.

Direct Electrochemical Preparation of Cobalt, Tungsten, and Tungsten Carbide from Cemented Carbide Scrap

2016 ◽  
Vol 48 (1) ◽  
pp. 692-700 ◽  
Author(s):  
Xiangjun Xiao ◽  
Xiaoli Xi ◽  
Zuoren Nie ◽  
Liwen Zhang ◽  
Liwen Ma
Keyword(s):  
Tungsten Carbide ◽  
Cemented Carbide ◽  
Electrochemical Preparation ◽  
And Tungsten
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