公开(公告)号：JP2003137518A

公开(公告)日：2003-05-14

申请号：JP2001333580

申请日：2001-10-31

Applicant: NAT INST FOR MATERIALS SCIENCE

Inventor： KOBAYASHI TAKAMICHI ,  SEKINE TOSHIMORI

IPC: C01B31/02

Abstract: PROBLEM TO BE SOLVED: To provide a method for synthesizing carbon onion by a collision on a shock board. SOLUTION: This method comprises mixing silicon carbide (α-SiC or β-SiC) powders with copper powders and pressurizing the resultant mixture by a shock wave to synthesize carbon onion, and is characterized by applying an ultra-high pressure and temperature shock compression having a pressure of 350,000 atm or more and a temperature of 2,700 deg.C or higher to the pressurized formed body of SiC and copper powders. It is preferable that the density of the pressurized formed body is 6.0 g/cm or higher and the pressure of shock compression is 350,000 atm or higher.

公开(公告)号：JP2002121013A

公开(公告)日：2002-04-23

申请号：JP2000312642

申请日：2000-10-12

Applicant: NAT INST FOR MATERIALS SCIENCE

Inventor： SEKINE TOSHIMORI ,  GA KORYO ,  KOBAYASHI HIROMICHI ,  MITOMO MAMORU

IPC: B01J3/08 ,  C01B21/082

Abstract: PROBLEM TO BE SOLVED: To convert powder of sialon of a starting raw material to high pressure phase spinel type sialon with only once shock treatment without changing the composition. SOLUTION: The high pressure phase spinel type sialon is represented by the chemical formula: Si6-xAlxOxN8-x (0 =15 GPa pressure for

公开(公告)号：JP2002265205A

公开(公告)日：2002-09-18

申请号：JP2001067640

申请日：2001-03-09

Applicant: NAT INST FOR MATERIALS SCIENCE

Inventor： SEKINE TOSHIMORI ,  YAJIMA YOSHIYUKI

IPC: C01B21/082

Abstract: PROBLEM TO BE SOLVED: To provide a method for efficiently separating and purifying an amorphous substance coexisting with a cubic spinel type sialon. SOLUTION: In a method for separating and purifying mixed powder of the high-pressure phase spinel type sialon and the amorphous substance manufactured by treating β-sialon (chemical formula, Si6-Z AlZ N8-Z , 0

公开(公告)号：JP2002179414A

公开(公告)日：2002-06-26

申请号：JP2000377010

申请日：2000-12-12

Applicant: NAT INST FOR MATERIALS SCIENCE

Inventor： SEKINE TOSHIMORI ,  GA KORYO ,  KOBAYASHI TAKAMICHI ,  KIMOTO KOJI ,  MITOMO MAMORU

IPC: C01B21/082

Abstract: PROBLEM TO BE SOLVED: To obtain a spinel-type silicon oxynitride-based new substance by utilizing a shock treatment technology which is a conventional technology and in which shock waves are used. SOLUTION: The spinel-type silicon oxynitride-based new substance is a high pressure phase spinel-type silicon oxynitride expressed by chemical formula: Si3+xO2xN4(=Si3N4.xSiO2, 0 =20 GPa is added within 5 μ-second.

公开(公告)号：JP2003117379A

公开(公告)日：2003-04-22

申请号：JP2001313345

申请日：2001-10-11

Applicant: NAT INST FOR MATERIALS SCIENCE

Inventor： SEKINE TOSHIMORI

IPC: B01J3/08 ,  C01B31/06

Abstract: PROBLEM TO BE SOLVED: To synthesize hexagonal diamond powder with a high conversion rate from cubic diamond powder by one-time impact process. SOLUTION: Hexagonal diamond in a high pressure phase is synthesized by using the shear-stress effect generated by instantaneous uniaxial pressurizing by the shock waves due to collision of a high-speed article. In this method, the hexagonal diamond powder is synthesized by instantaneously pressurizing cubic diamond powder by shock waves at 30>=GPa impact pressure.

公开(公告)号：JP2002255516A

公开(公告)日：2002-09-11

申请号：JP2001050675

申请日：2001-02-26

Applicant: NAT INST FOR MATERIALS SCIENCE

Inventor： SEKINE TOSHIMORI ,  GA KORYO ,  KOBAYASHI TAKAMICHI

IPC: C01B21/06 ,  B01J3/08

Abstract: PROBLEM TO BE SOLVED: To improve a production method or spinel germanium nitride, in the conventional method of which only a sample amount of 100 mg or less can be manufactured on an experiment scale with one time, and the grinding process, or the like, is necessary for obtaining fine particles. SOLUTION: In the method for synthesizing a high pressure phase spinel germanium nitride by pressing a low pressure phase germanium nitride (α-Ga3 N4 , β-Ga3 N4 or amorphous Ge3 N4 ) by a shock wave, the pressing compact of a mixture of low pressure phase powder and metal powder is put into a metal vessel, and the production method for spinel germanium nitride powder is characterized by momentary pressing the shock wave pressure of 20 GPa or more and the pressurization time of 5 microseconds or less. As the metal power copper powder is used, and the mixing ratio of copper in mixture of the low pressure phase powder and the copper powder is set to 99 wt.%-50 wt.%, the density of the pressure compact of the mixture is preferably set to 8.9 g/cm -4.5 g/cm .

公开(公告)号：JP2002179412A

公开(公告)日：2002-06-26

申请号：JP2000379336

申请日：2000-12-13

Applicant: NAT INST FOR MATERIALS SCIENCE ,  NOF CORP

Inventor： SEKINE TOSHIMORI ,  YAJIMA YOSHIYUKI ,  TAKAHASHI KATSUHIKO ,  ITO KENJI

IPC: C01B21/068

Abstract: PROBLEM TO BE SOLVED: To provide a method of isolating and refining cubic spinel-type silicon nitride, by which unreacted low pressure phase silicon nitride contained in the cubic spinel-type silicon nitride as an impurity can be separated and the purity of the cubic spinel-type silicon nitride can be heightened. SOLUTION: The isolation and refining of the cubic spinel-type silicon nitride comprises accommodating a mixed power 12 comprising the cubic spinel-type silicon nitride and the low pressure phase silicon nitride and a mixed acid solution 13 comprising hydrofluoric acid and nitric acid or sulfuric acid in a reaction vessel 1 and reacting them while heating. Thereby, the low pressure phase silicon nitride reacts with the hydrofluoric acid and the unreacted low pressure phase silicon nitride in the cubic spinel-type silicon nitride is isolated and the cubic spinel-type silicon nitride is refined. The temperature at which the mixed acid solution is allowed to act is preferably 110 to 160 deg.C. It is preferable that both of the cubic spinel-type silicon nitride and the low pressure phase silicon nitride are powders and the particle diameters of each powder are

公开(公告)号：JP2002248343A

公开(公告)日：2002-09-03

申请号：JP2001050643

申请日：2001-02-26

Applicant: NAT INST FOR MATERIALS SCIENCE

Inventor： SEKINE TOSHIMORI ,  GA KORYO ,  KOBAYASHI TAKAMICHI

IPC: H05H1/24 ,  B01J19/08 ,  H05H3/00

Abstract: PROBLEM TO BE SOLVED: To provide a method for generating an instantaneous ultrahigh gravitational field realized when a minute flying object is accelerated by making good use of the abrasion by a pulsed laser beam. SOLUTION: The method for generating an instantaneous ultrahigh gravitational field of over 10 m/s is characterized in that an ultrahigh gravitational field of 10 to 10 m/s lasting for around 10-50 nanoseconds can be realized when the minute part of aluminum metallic foil having 3-100 μm thickness is accelerated by the expansion of abrasion plasma by converging/irradiating the aluminum metallic foil with the pulsed laser beam having 10 W/cm or higher intensity.