scholarly journals Comparison of dynamic tensile extrusion behaviour of WCu composites made by different processes

2018 ◽  
Vol 183 ◽  
pp. 03004
Author(s):  
Leeju Park ◽  
Sanghyun Woo ◽  
Yerim Lee ◽  
Keunho Lee ◽  
Young Sun Yi
Keyword(s):  
Composite Powder ◽  
Tungsten Powder ◽  
The Other ◽  
Metal Injection Molding ◽  
Oil Well ◽  
Well Completion ◽  
Extrusion Die ◽  
Steel Target ◽  
Copper Composite ◽  
Molding Methods

Composites with 60~90% of tungsten are used in liners of some specialty shaped charges. The penetration is enhanced by a factor against copper for homogeneous steel target. Tungsten powder based shaped charge liners are also especially suitable for oil well completion. In this study, WCu composites manufactured by different process are used for testing of dynamic tensile extrusion (DTE) behaviour. One samples were made by copper infiltrated method. The other samples were manufactured by metal injection molding methods with reduced tungsten copper composite powder. DTE tests were carried out by launching the sphere samples (Dia. 7.62mm) to the conical extrusion die at a speed of ~375m/s. The DTE fragmentation behaviour of tungsten copper composites after soft-recovered were examined and compared with each other.

Preparation of Tungsten-Copper Composite Powder by Electroless Plating

2013 ◽  
Vol 749 ◽  
pp. 28-34
Author(s):  
Ying Wang ◽  
Jun Tao Zou ◽  
Qing He Zhang
Keyword(s):  
Composite Powder ◽  
Tungsten Powder ◽  
Solution Temperature ◽  
Formaldehyde Concentration ◽  
Copper Plating ◽  
Electroless Copper Plating ◽  
Powder Surface ◽  
Operation Conditions ◽  
Electroless Copper ◽  
Copper Composite

In this paper, tungsten-copper composite powder was prepared on the particle size of 6 ~ 10μm tungsten powder surface by electroless copper plating. The orthogonal experimental results show that the primary and secondary order of factors affecting the deposition rate followwing the sequence: copper sulfate solution concentration > pH value> solution temperature> formaldehyde concentration > complexing agent concentration. The process of the electroless copper plating on the tungsten powder surface was investigated, and the best electroless copper plating solution composition and operation conditions were obtained as follows: plating temperature 323 K, stirring speed 30 r/min, PH =13, loadage 8g/L, CuSO4 5H2O 0.032 mol/L, HCHO 0.274 mol/L, TEA 0.1208 mol/L, 2, 2 'league pyridine 12 mg/L.

Research on the Manufacture of some Tungsten-Copper Composite after Vacuum Sintering

2011 ◽  
Vol 672 ◽  
pp. 311-314
Author(s):  
Cristina Ileana Pascu ◽  
Alexandru Stanimir ◽  
Ioan Vida-Simiti
Keyword(s):  
Sintering Temperature ◽  
Tungsten Powder ◽  
Compaction Pressure ◽  
Great Power ◽  
Densification Process ◽  
Vacuum Sintering ◽  
Infiltration Temperature ◽  
High Tension ◽  
Copper Composite ◽  
Electrical Apparatus

The paper presents the results of the experimental research carried out in order to obtain pseudoalloys WNiCu used in electrical industry, for the electrical apparatus of high tension and great power. As a result it was compulsory to study the parameters that influence the densification process and the sintered properties, depending on the grain-size distribution of tungsten powder, compaction pressure and sintering temperature in vacuum. Therefore, it has been studied the influence of these parameters on the density, hardness and microstructures changes for the composites with 78%W-2%Ni-20%Cu, (% wt). The better results were obtained for the value of 1350 0C for the copper infiltration temperature.

Rheological Behavior of Carbon Nanotubes / Copper Feedstocks for Metal Injection Molding

2011 ◽  
Vol 403-408 ◽  
pp. 5335-5340 ◽  
Author(s):  
Faiz Ahmad ◽  
Ali Samer Muhsan ◽  
M. Rafi Raza
Keyword(s):  
Carbon Nanotubes ◽  
Injection Molding ◽  
Flow Behavior ◽  
Metal Injection Molding ◽  
Increasing Trend ◽  
Multi Walled Carbon Nanotubes ◽  
Blade Mixer ◽  
Near Net Shape ◽  
Copper Composite ◽  
Walled Carbon Nanotubes

Metal injection molding (MIM) technology is known for its ability of producing near net shape components. This study presents the results of flow behavior of multi-walled carbon nanotubes (MWCNTs) reinforced copper composites mixes. The solid loadings in the copper mixes were investigated in the ranges of 55-61 V% using a binder. Copper mixes and copper/MWCNTs were compounded using a Z-blade mixer for homogenous dispersion of solids in the binder. Results identified a mix containing 59 V% copper suitable for substitution of MWCNTs. The flow properties were measured using a capillary rheometer in the shear rate range expected to occur during metal injection molding. An increasing trend in viscosity of the copper mixes with powder loading was noted. Copper/MWCNTs composite mixes showed viscosity more than 1000 Pa.s perhaps due to addition of MWCNTs and increasing trend in viscosity of copper/MWECNTs was recorded. The results of flow data showed that all copper composite mix containing up to 10 Vol.% MWCNTs were successfully injection molding and test samples were produced.

Green Nanoparticle Oil Well Cement from Agro Waste Rice Husk Ash

2014 ◽  
Vol 974 ◽  
pp. 26-32
Author(s):  
N. Alias ◽  
M.M.M. Nawang ◽  
N.A. Ghazali ◽  
T.A.T. Mohd ◽  
S.F.A. Manaf ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Rice Husk ◽  
Oil And Gas ◽  
Rice Husk Ash ◽  
Hydraulic Pressure ◽  
Oil Well ◽  
Potential Candidate ◽  
Well Completion ◽  
Oil Well Cement ◽  
Well Cement

Cement is an important part in oil and gas well completion. A high quality of cement is required to seal hydraulic pressure between casing and borehole formation. Cement additives were used to enhance the cement properties such as thickening time, compressive strength, porosity and permeability of the cement. Currently, the commercial additives were imported and the price is keep increasing year by year. Therefore, the researchers were continuously looking for potential additives such as nanoparticle to improve the cement properties. This paper presents the effect nanosilica on compressive strength and porosity of oil well cement type G. In this study, two type of nanosilica were used, synthesis nanosilica from rice husk ash (RHA) and commercial nanosilica. The synthesized nanosilica was characterized using fourier transform infrared spectroscopy (FTIR), X-ray flouresece (XRF) and Field Emission Scanning Electron Microscopy (FESEM). All the experiments were conducted using API standard procedures and specifications. Based on the results, compressive strength of cement slurries was improved from 2600 psi to 2800 psi for 8-hours curing, when the amount of nanosilica increased from 0 wt% to 1.5 wt%. Besides that, incorporation of nanosilica from RHA into cement formulation resulted in reduction of cement porosity up to 18 % pore volume. Overall, the results showed that the incorporation of nanosilica from RHA improved the oil well cement compressive strength and oil well cement porosity. In conclusion, green nanosilica from RHA can be a potential candidate to replace the commercial nanosilica to enhance the oil well cement properties as well as to prevent the migration of undesirable fluid which can lead to major blowout.

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