Gas Atomization Processing of LaNi5-x.Mm, Modified with Silicon and Tin

1998 ◽  
Vol 513 ◽  
Author(s):  
J. Ting ◽  
V. K. Pecharsky ◽  
I. E. Anderson ◽  
C. Witham ◽  
R. C. Bowman ◽  
...  
Keyword(s):  
High Pressure ◽  
Grain Boundaries ◽  
Rapid Solidification ◽  
Low Cost ◽  
Gas Atomization ◽  
High Quality ◽  
Multicomponent Alloys ◽  
Cell Structures ◽  
Short Annealing

ABSTRACTA high pressure gas atomization (HPGA) process has been employed to study microsegregation in LaNi4.75 Sn0.25 and LaNi4.6Si0.4 alloy powders to serve as a basis for further investigations of low cost production of multicomponent alloys in combination with mishmetal (Mm). This investigation is an attempt to produce high quality powders for battery cathode fabrication that can be used in an as-atomized condition without prolong annealing, hydridingdehydriding, and grinding. Argon atomizing gas was used in the HPGA process of the LaNi4.75Sn0.25 and LaNi4.6Si0.4 alloys to investigate rapid solidification effects on microsegregation. Short annealing treatments of 5 minutes at 900°C were able to homogenize both alloy compositions, eliminating solidification micro-segregation along the grain boundaries phases. The rapid homogenization can be attributed primarily to the refined cell structures in gas-atomized particles that provide short diffusion pathways for the dissolving elements.

Research and Application of Three-Times Pulse Composite Perforating Technology

2017 ◽  
Vol 865 ◽  
pp. 94-99
Author(s):  
Kun Zhao
Keyword(s):  
High Pressure ◽  
Low Cost ◽  
Shaped Charge ◽  
Main Principle ◽  
Solid Rocket Propellant ◽  
High Quality ◽  
Obvious Effect ◽  
Diversion Channel ◽  
Quality Technology ◽  
Solid Rocket

The three-times pulse composite perforating technology is a high quality technology which integrates the perforation and powder fracturing. The main principle is that the shaped charge and the fracture powder are ignited by detonating cord simultaneously. And the perforating jet is formed along the different phases, the high-pressure gas generated by the deflagration of the solid rocket propellant in the cracker fractures the stratum along the perforated hole [1], which can form high diversion channel and crack in the near wellbore area increasing the jet area. After the application of more than 1000 well fields, this technology has obvious effect of increasing production, which has certain reliability, security and low cost.

Benefits of Rapid Solidification Processing of Modified LaNi5 Alloys by High Pressure Gas Atomization for Battery Applications

1997 ◽  
Vol 496 ◽  
Author(s):  
I. E. Anderson ◽  
V. K. Pecharsky ◽  
J. Ting ◽  
C. Witham ◽  
R. C. Bowman
Keyword(s):  
High Pressure ◽  
Rapid Solidification ◽  
Powder Processing ◽  
Microstructural Analysis ◽  
Hydrogen Gas ◽  
Gas Atomization ◽  
Industrial Practice ◽  
Phase Cycling ◽  
Gas Cycling ◽  
Annealing Experiments

ABSTRACTA high pressure gas atomization approach to rapid solidification has been employed to investigate simplified processing of Sn modified LaNi5 powders that can be used for advanced Ni/metal hydride (Ni/MH) batteries. The current industrial practice involves casting large ingots followed by annealing and grinding and utilizes a complex and costly alloy design. This investigation is an attempt to produce powders for battery cathode fabrication that can be used in an as-atomized condition without annealing or grinding. Both Ar and He atomization gas were tried to investigate rapid solidification effects. Sn alloy additions were tested to promote subambient pressure absorption/desorption of hydrogen at ambient temperature. The resulting fine, spherical powders were subject to microstructural analysis, hydrogen gas cycling, and annealing experiments to evaluate suitability for Ni/MH battery applications. The results demonstrate that a brief anneal is required to homogenize the as-solidified microstructure of both Ar and He atomized powders and to achieve a suitable hydrogen absorption behavior. The Sn addition also appears to suppress cracking during hydrogen gas phase cycling in particles smaller than about 25μm. These results suggest that direct powder processing of a LaNi5−xSnx alloy has potential application in rechargeable Ni/MH batteries.

Under High Pressure: Spherical Glass Flotation and Instrument Housings in Deep Ocean Research

2009 ◽  
Vol 43 (5) ◽  
pp. 105-109 ◽  
Author(s):  
Steffen Pausch ◽  
Detlef Below ◽  
Kevin Hardy
Keyword(s):  
High Pressure ◽  
Low Cost ◽  
Weight Ratio ◽  
Deep Ocean ◽  
The Other ◽  
Raw Material ◽  
Advanced Manufacturing Technology ◽  
Advanced Manufacturing ◽  
High Quality ◽  
Glass Spheres

AbstractAll stationary and autonomous instrumentation for observational activities in ocean research have two things in common, they need pressure-resistant housings and buoyancy to bring instruments safely back to the surface. The use of glass spheres is attractive in many ways. Glass qualities such as the immense strength‐weight ratio, corrosion resistance, and low cost make glass spheres ideal for both flotation and instrument housings. On the other hand, glass is brittle and hence subject to damage from impact. The production of glass spheres therefore requires high-quality raw material, advanced manufacturing technology and expertise in processing. VITROVEX® spheres made of DURAN® borosilicate glass 3.3 are the only commercially available 17-inch glass spheres with operational ratings to full ocean trench depth. They provide a low-cost option for specialized flotation and instrument housings.

Jet freezing of cells and tissues with and without cryoprotectants

1993 ◽  
Vol 51 ◽  
pp. 106-107
Author(s):  
M.V. Parthasarathy ◽  
Carole Daugherty ◽  
T. Müller
Keyword(s):  
High Pressure ◽  
Biological Samples ◽  
Plant Cells ◽  
Freeze Substitution ◽  
Chemical Fixation ◽  
High Pressure Freezing ◽  
High Quality ◽  
The Past ◽  
Copper Specimen ◽  
Cell Structures

For the past several years cryofixation/freeze-substitution techniques have become valuable alternatives to chemical fixation of biological specimens. The superiority of cryofixation in preserving labile cell structures has been documented in several studies. Commercially available jet freezers and the BAL-TEC HPM010 high pressure freezer have extended high quality cryofixation from monolayer cells to cells relatively deep inside tissues. High pressure freezing can theoretically freeze biological materials of 0.5 mm thickness without the use of cryoprotectants and propane jet freezing is reported to freeze biological samples up to 40 μm in thickness without cryoprotection. Although high pressure freezing is the obvious method of choice for freezing large biological samples, its high cost combined with its apparent inability to consistently preserve microfilaments in some plant cells has prompted us to explore the capability of jet freezing to yield well frozen samples with and without cryoprotectants.We used the commercially available jet freezer JFD 030 (BAL-TEC) to obtain our results. Tightly pelleted cells sandwiched between 0.1 mm thick copper specimen carriers normally froze well without any cryoprotectants, after propane jet freezing (Figs. 1-2).

scholarly journals Urban Air Quality Modeling Using Low-Cost Sensor Network and Data Assimilation in the Aburrá Valley, Colombia

Atmosphere ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 91
Author(s):  
Santiago Lopez-Restrepo ◽  
Andres Yarce ◽  
Nicolás Pinel ◽  
O.L. Quintero ◽  
Arjo Segers ◽  
...  
Keyword(s):  
Air Quality ◽  
Data Assimilation ◽  
Transport Model ◽  
Cost Model ◽  
Low Cost ◽  
Model Performance ◽  
Monitoring Network ◽  
Correlation Factor ◽  
Chemical Transport Model ◽  
High Quality

The use of low air quality networks has been increasing in recent years to study urban pollution dynamics. Here we show the evaluation of the operational Aburrá Valley’s low-cost network against the official monitoring network. The results show that the PM2.5 low-cost measurements are very close to those observed by the official network. Additionally, the low-cost allows a higher spatial representation of the concentrations across the valley. We integrate low-cost observations with the chemical transport model Long Term Ozone Simulation-European Operational Smog (LOTOS-EUROS) using data assimilation. Two different configurations of the low-cost network were assimilated: using the whole low-cost network (255 sensors), and a high-quality selection using just the sensors with a correlation factor greater than 0.8 with respect to the official network (115 sensors). The official stations were also assimilated to compare the more dense low-cost network’s impact on the model performance. Both simulations assimilating the low-cost model outperform the model without assimilation and assimilating the official network. The capability to issue warnings for pollution events is also improved by assimilating the low-cost network with respect to the other simulations. Finally, the simulation using the high-quality configuration has lower error values than using the complete low-cost network, showing that it is essential to consider the quality and location and not just the total number of sensors. Our results suggest that with the current advance in low-cost sensors, it is possible to improve model performance with low-cost network data assimilation.

scholarly journals Linum usitatisimum L. is the most important crop in Russia for the production of high-quality oil with low cost (review)

2021 ◽  
Vol 640 (4) ◽  
pp. 042014
Author(s):  
E N Turin ◽  
A N Susskiy ◽  
R S Stukalov ◽  
M V Shestopalov ◽  
E L Turina ◽  
...  
Keyword(s):  
Low Cost ◽  
High Quality ◽  
Important Crop
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