A Study on the Consolidation of Cu, Ni / Graphite Powder Using Shock Compaction Method

2007 ◽  
Vol 566 ◽  
pp. 345-350 ◽  
Author(s):  
Young Kook Kim ◽  
Kazuyuki Hokamoto ◽  
Shigeru Itoh
Keyword(s):  
Shock Wave ◽  
Particle Size ◽  
Powder Particle ◽  
Graphite Powder ◽  
Shock Pressure ◽  
Powder Particle Size ◽  
Underwater Shock Wave ◽  
Shock Compaction ◽  
Underwater Shock ◽  
Compaction Method

A shock compaction method using an underwater shockwave is used to consolidate the Cu/graphite and Ni/graphite composites. The copper powder (particle size < 45 m) and nickel powder (particle size < 150 m) were respectively mixed with the graphite powder (particle size < 45 m, purity 99.9%). The propagation phenomenon of underwater shock wave is studied by means of numerical analysis (LS-DYNA 3D) in terms of the magnitude and distribution of shock pressure impinged on the powder surface. The shock pressure of underwater shock wave obtained from shock compaction device is approximately 16 GPa. To make a big size material (ø30mm), we changed the inner size of powder container from ø10 mm to ø30 mm. We confirmed that the consolidation possibility of the big size composite materials (Cu/graphite, Ni/graphite) by the shock compaction method using underwater shock wave.

Optimal Design of Shock Compaction Device

2007 ◽  
Vol 566 ◽  
pp. 339-344 ◽  
Author(s):  
Young Kook Kim ◽  
Kazuyuki Hokamoto ◽  
Shigeru Itoh
Keyword(s):  
Shock Wave ◽  
Numerical Analysis ◽  
Optimal Design ◽  
Shock Pressure ◽  
Underwater Shock Wave ◽  
Reflected Wave ◽  
Shock Compaction ◽  
Water Container ◽  
Underwater Shock

In order to achieve an optimal design of shock compaction device, various designs of parts are attempted. For the height of water container that creates an underwater shock wave and a reflected wave, a characteristic of underwater shock wave is evaluated by means of numerical analysis. It is found that the underwater shock wave and the reflected wave became one wave with higher shock pressure in the case of water container (height 21.5 mm). Also, the evaluation for a powder container is experimentally tried in consideration of reuse.

SHOCK COMPACTION OF MnAs[sub 1−x]Sb[sub x] POWDER USING UNDERWATER SHOCK WAVE

2008 ◽  
Author(s):  
Y. K. Kim ◽  
H. Wada ◽  
S. Itoh ◽  
Mark Elert ◽  
Michael D. Furnish ◽  
...  
Keyword(s):  
Shock Wave ◽  
Underwater Shock Wave ◽  
Shock Compaction ◽  
Underwater Shock

603 Shock Compaction of Mg-SiC Composites Using Underwater Shock Wave

2012 ◽  
Vol 2012.20 (0) ◽  
pp. _603-1_-_603-4_
Author(s):  
Y. OTSUKA ◽  
Y. MITSUNO ◽  
Palavesamuthu MANIKANDAN ◽  
K. HOKAMOTO
Keyword(s):  
Shock Wave ◽  
Underwater Shock Wave ◽  
Shock Compaction ◽  
Underwater Shock ◽  
Sic Composites

A Deburring Process Performed by Underwater Shock Wave

2011 ◽  
Vol 673 ◽  
pp. 271-274 ◽  
Author(s):  
Kazumasa Shiramoto ◽  
Junki Shimizu ◽  
Akiyoshi Kobayashi ◽  
Masahiro Fujita
Keyword(s):  
Shock Wave ◽  
High Speed ◽  
Present Report ◽  
Shock Pressure ◽  
Normal Operation ◽  
Underwater Shock Wave ◽  
Water Flows ◽  
Underwater Shock ◽  
Machining Operations ◽  
Equipment Performance

A burr is most commonly created after machining operations, such as drilling. Drilling burrs, for example, are common when drilling almost any material. When burrs are broken during the operation of a machine including the parts with the created burrs, the broken piece is in fear of disturbing normal operation or damaging the parts of the machine, so that the sufficient deburring is requested because it can affect equipment performance, reliability, and durability. Several deburring method have been developed up to date. In the present report, we proposed a deburring method by means of applying underwater shock wave. The method is as follows: after all entrance of holes is closed with seal tape, the equipment is submerged, so that all passages for running fluid are filled with air. The explosive is set under water near the entrance of the main hole. As soon as the explosive is detonated, the underwater shock wave generated at the detonation point arrives at the entrance of the hole and breaks through the tape. The water flows into the hole with a high speed. The burr is broken by water hummer action of high speed. In the present investigation, the experiments of deburring are performed under some setting conditions of explosive. It is found by experimental results, that the burr is sufficiently removed with the newly proposed method. When the shock pressure is sufficiently high at the entrance of hole, the burr is broken surface is smooth as polished one. When the shock pressure is not sufficiently high, the broken surface of the burr is notched.

Study of the influence of the graphite powder particle size on the structure of the Sonogel-Carbon materials

2006 ◽  
Vol 40 (1) ◽  
pp. 55-64 ◽  
Author(s):  
Laura M. Cubillana-Aguilera ◽  
José M. Palacios-Santander ◽  
Ignacio Naranjo-Rodríguez ◽  
José Luis Hidalgo-Hidalgo-de-Cisneros
Keyword(s):  
Particle Size ◽  
Powder Particle ◽  
Carbon Materials ◽  
Graphite Powder ◽  
Powder Particle Size

A New Method of Explosive Welding Performed by Effective Application of Reflected Underwater Shock Wave

2006 ◽  
Author(s):  
Kazumasa Shiramoto ◽  
Masahiro Fujita ◽  
Hirofumi Iyama ◽  
Yasuhiro Ujimoto ◽  
Shigeru Itoh
Keyword(s):  
Shock Wave ◽  
Explosive Welding ◽  
Underwater Explosion ◽  
Shock Pressure ◽  
Experimental Results ◽  
New Method ◽  
Underwater Shock Wave ◽  
Effective Application ◽  
Welding Method ◽  
Underwater Shock

In this report, we propose a new explosive welding method, and the welding is performed at employing underwater shock pressure produced by the underwater explosion of an explosive placed at one side almost vertical to the specimen to be welded. In order to prevent the reduction of the shock pressure with the distance away from explosive, a steel reflector is placed over the area of the specimen. The effects of the reflector are investigated based on the experimental results and the process is numerically analyzed results.

Study of the Suitable Pressure Vessel for the Rice-Powder Manufacturing Using the Underwater Shock Wave

2011 ◽  
Author(s):  
K. Shimojima ◽  
Y. Miyafuji ◽  
S. Tanaka ◽  
K. Naha ◽  
T. Aka ◽  
...  
Keyword(s):  
Shock Wave ◽  
Pressure Vessel ◽  
Pressure Vessels ◽  
Powder Particle Size ◽  
Underwater Shock Wave ◽  
Manufacturing Efficiency ◽  
Self Sufficiency ◽  
Shock Wave Generation ◽  
Underwater Shock ◽  
Rice Powder

Self-sufficiency in food is very low (about 40%) in Japan. Therefore, the rice powder is paid to attention, because it can be processed to the udon (noodle) and bread etc. We have already developed the rice-powder disintegrator using the underwater shock wave by the electrode. But it has not been cleared what is the most suitable pressure vessel. The purpose of this study is to investigate the most suitable configuration of the pressure vessels for manufacturing the rice-powder using the underwater shock wave.Experimental conditions to manufacture the rice-powder (particle size is 100μm) is clarified using this device.Moreover, the manufacturing efficiency of the rice-powder, the relation between the number of the shock wave generation and the grain degree of rice-powder is clarified.

A Study on the Powder Consolidation of Metal Powder for Magnetic Material Using Underwater Shock Wave

2006 ◽  
Author(s):  
Kazuhiro Kawano ◽  
Young Kook Kim ◽  
Hideki Hamashima ◽  
Shigeru Itoh
Keyword(s):  
Magnetic Material ◽  
Shock Wave ◽  
High Pressure ◽  
Numerical Analysis ◽  
Heating System ◽  
Metal Powders ◽  
Underwater Shock Wave ◽  
Powder Consolidation ◽  
Shock Compaction ◽  
Underwater Shock

In order to consolidate metal powders, the present investigation uses a shock wave derived from the detonation of an explosive and it’s called a shock compaction method. In the present investigation, we employed an ultra-high pressure generation device in order to generate underwater shock wave. The underwater shock wave is derived from the detonation wave in a water container and after that underwater shock wave is converged in the central axis. Finally, the high pressure of underwater shock wave is uniformly impinged on the powders. In case of experimental data that is measured by manganin gauge, the peak pressure of underwater shock wave is 16.8GPa, the result of numerical analysis is 17.9GPa. Considering for the measurement error (1GPa), it seems to be good agreement between the result of numerical analysis and experiment. Nd-Fe-B magnetic material powders are tried to consolidate using the assembly under optional temperatures by heating system and the samples recovered under different conditions were examined in terms of magnetic properties.

Research on the Powder Consolidation by Using Shock Compaction Method

2010 ◽  
Author(s):  
Keijiro Nishi ◽  
Makoto Ide ◽  
Nozomi Terasawa ◽  
Seiichi Irie ◽  
Shigeru Itoh
Keyword(s):  
Thermal Conductivity ◽  
Shock Wave ◽  
Composite Material ◽  
Particle Surface ◽  
Copper Matrix ◽  
Underwater Shock Wave ◽  
Powder Consolidation ◽  
Shock Compaction ◽  
Underwater Shock ◽  
Diamond Powders

Shock compaction of powder by using an underwater shock wave is studied and the technical advantages are reported. In this research, we propose a technique for shock compaction of copper/diamond powders by using an underwater shock wave generated by the detonation of explosive. This process produces a composite material in which the particles are strongly bonded due to melting caused by strong deformation and rapid solidification at the particle surface. The improvement of the thermal conductivity of the composite material collected is expected, because the diamond has a high thermal conductivity. Good compacts of composite materials in which diamond particles were dispersed in the copper matrix were obtained in this experiment, and their microstructures and thermal properties were examined. Moreover, pressure measurements and numerical calculations were performed to assess the effect of the pressuring condition in the explosive container.

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