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1. 发明专利

JPS58130205A ELECTRODE DEVICE IN PRODUCING DEVICE FOR FINE METALLIC PARTICLES 失效
公开(公告)号：JPS58130205A
公开(公告)日：1983-08-03
申请号：JP1306882
申请日：1982-01-29
申请人： NAT RES INST METALS , PIONEER ELECTRONIC CORP
发明人： UDA MASAHIRO , OONO SATORU , TSUKAGOSHI NOBUHIRO , ITOU HIROSHI , YOSHIKAWA TAKAMASA , UNOSAWA YASUHIRO
IPC分类号： B22F9/14 , C25C5/04
摘要： PURPOSE:To prevent the consumption and deterioration of a gas injection type electrode of specific construction by sticking of fine metallic particles thereon in the stage of producing the fine metallic particles by arc discharge by using said electrode and tilting an arc column. CONSTITUTION:In the stage of melting Fe, Ni, Co and the alloys thereof to fine powder by arc discharge, gaseous hydrogen or a gaseous mixture of gaseous hydrogen and an inert gas such as He and Ar is ejected with a pipe 4 from the clearance between an electrode 1 for electric discharge and a nozzle 3 around the same as an electrode for arc discharge, and a supporting frame 2 for the electrode is inclined to incline the arc column generated from the electrode 1 in a vertical direction. The consumption and deterioration of the electrode by sticking of the fine metallic powder thereon are prevented by the inclination of the arc column and the injection of the gaseous flow from the electrode.

2. 发明专利

JPS62283805A PRODUCTION OF EXTREMELY FINE ALUMINUM NITRIDE POWDER 失效
公开(公告)号：JPS62283805A
公开(公告)日：1987-12-09
申请号：JP12466686
申请日：1986-05-31
申请人： NAT RES INST METALS
发明人： UDA MASAHIRO , ONO SATORU , OKUYAMA HIDEO
IPC分类号： C01B21/072 , B01J12/00 , B01J19/08
摘要： PURPOSE:To produce the title extremely fine powder of AlN by using a gaseous mixture of N2 and NH3 or the gaseous mixture further added with an inert gas as the ambient atmosphere when metallic Al is melted in the frame of arc or a plasma jet to produce the fine powder. CONSTITUTION:Al 4 is charged in the heating furnace 5 in a closed vessel 8, and the inside of the closed vessel 8 is evacuated. The Al 4 is heated and melted in the heating furnace 5, gaseous N2 is introduced from a gas inlet 1 for a discharge electrode, and gaseous NH3 is introduced from an inlet 2 for an atmospheric gas as a spiral-flow gas around an arc plasma 3. In this case, the ratio of N2 to NH3 is controlled to 0.01-50, and the gaseous mixture is diluted, as required, with an inert gas to form a dilute (N2+NH3) gas atmosphere. The active chemical species such as NH2, NH, N, etc., formed by the decomposition of NH3 in the arc plasma 3 reacts with Al vapor, and extremely fine AlN powder is formed.

3. 发明专利

JPS62282635A PRODUCTION OF MIXTURE OF ULTRA-FINE ALUMINUM NITRIDE POWDER AND ULTRA-FINE OXIDATION-RESISTANT ALUMINUM POWDER 失效
公开(公告)号：JPS62282635A
公开(公告)日：1987-12-08
申请号：JP12466786
申请日：1986-05-31
申请人： NAT RES INST METALS
发明人： UDA MASAHIRO , ONO SATORU , OKUYAMA HIDEO
IPC分类号： C01B21/072 , B01J8/32 , B01J19/00 , B22F1/00 , B22F9/14
摘要： PURPOSE:To highly purify the titled ultra-fine powder at low temp. and in a short time by introducing the mixture of the ultra-fine powder of aluminum nitride and metallic aluminum into a fluidized bed at 400-1,000 deg.C in a nitrogen atmosphere to partially nitride the surface of the ultra-fine metallic aluminum powder. CONSTITUTION:Metallic aluminum is melted by the flame of an arc or plasma jet generator in the atmosphere of nitrogen or a mixture of nitrogen and an inert gas to generate a mixture of the ultra-fine powder of aluminum nitride and metallic aluminum. The mixture of the ultra-fine powder is introduced into a fluidized bed heated at 400-1,000 deg.C in the nitrogen atmosphere to partially nitride the surface of the ultra-fine metallic aluminum powder. The device for producing mixed ultra-fine powder by plasma generation can be composed, for example, of a closed vessel 1, arc plasma 2, molten aluminum, the fluidized bed 4, and an atmosphere gas inlet 5.

4. 发明专利

JPS58104103A METHOD AND DEVICE FOR PRODUCING FINE METALLIC PARTICLE 失效
公开(公告)号：JPS58104103A
公开(公告)日：1983-06-21
申请号：JP20256881
申请日：1981-12-17
申请人： NAT RES INST METALS
发明人： UDA MASAHIRO , OONO SATORU , HOSHI TSUTOMU
IPC分类号： B22F1/00 , B22F9/06 , B22F9/08 , B22F9/14
摘要： PURPOSE:To produce fine metallic particles having a narrow grain size distribution range and to capture said particles in high recovery rate by dissolving the hydrogen activated by arcs, plasma discharge, etc. in molten metal, then releasing the same, transferring the fine metallic particles generated by the releasing by means of gaseous flow and cooling the same. CONSTITUTION:Voltage is applied between a discharging electrode 2 and metal (or alloy) 4 in a sealed vessel 1, whereby arcs 3 are generated. Thus, the activation of the introduced hydrogen and the melting of the metal 4 are effected. Here, the reaction between the activated hydrogen and the molten metal is induced and the activated hydrogen is dissolved in the molten metal. When the hydrogen is released therefrom, fine metallic particles are generated. The fine metallic particles are sucked by the gaseous flow introduced through a gas introducing port 8 or 8' and is sucked by a suction apparatus 6. The sucked particles are carried to a cooler 7, by which the particles are quickly cooled and the cooled particles are transferred into a capturing device 9 and are thus captured. The gas sucked by a suction pump 10 is circulated to the port 8 or 8'.

5. 发明专利

JPS57144045A SIZE SEPARATING METHOD FOR MAGNETIC POWDER 失效
公开(公告)号：JPS57144045A
公开(公告)日：1982-09-06
申请号：JP2981181
申请日：1981-03-04
申请人： NAT RES INST METALS
发明人： UDA MASAHIRO , OONO SATORU
IPC分类号： B03C1/00 , B03C1/30
摘要： PURPOSE:To separate and recover magnetic powder of specified particle diameter by moving a mixture of magnetic powder of different particle diameter in fluid and changing loci of movement of magnetic powder depending on particle diameter by applying a magnetic field. CONSTITUTION:A mixture of magnetic powder such as metals, intermetallic compounds, oxides etc.

6. 发明专利

JPS569304A MANUFACTURE OF FINE METAL PARTICLE 失效
公开(公告)号：JPS569304A
公开(公告)日：1981-01-30
申请号：JP8509579
申请日：1979-07-06
申请人： NAT RES INST METALS
发明人： UDA MASAHIRO , OONO SATORU , HOSHI TSUTOMU
IPC分类号： B22F9/06 , B22F9/00 , B22F9/14
摘要： PURPOSE:To manufacture fine particles of a pure metal or an alloy with good efficiency in a small-scale apparatus in which hydrogen or hydrogen-containing functional groups of hydrogen or a nonoxidative compound gas containing hydrogen is activated, reacted with a molten pure with a molten pure metal or an alloy and then discharged. CONSTITUTION:Part or whole of hydrogen or hydrogen-containing functional groups of hydrogen gas or a nonoxidatine compound containing hydrogen, e.g., CH4, C2H4, NH3, etc., or a mixture of both gases or of these gases and an inert gas is activated by heating with arc, plasma, etc., for excitation, dessociation, or ionization. Then, the activated gas is reacted with a molten pure metal or an alloy to dissolve an supersaturated amount of hydrogen in the molten metal or alloy. Thereby, as the supersaturation degree of hydrogen increases, the dissipating rate of hydrogen from the molten metal increases and the dessipating hydrogen is accompanied by fine metal particles, thus increasing the manufacturing facility of fine metal particles of diameters of approx. 10 microns or less.

7. 发明专利

JPS61242902A PRODUCTION OF ULTRAFINE PARTICLE OF HIGH-MELTING METALLIC OXIDE 失效
公开(公告)号：JPS61242902A
公开(公告)日：1986-10-29
申请号：JP8213185
申请日：1985-04-19
申请人： NAT RES INST METALS
发明人： UDA MASAHIRO , ONO SATORU , OKUYAMA HIDEO
IPC分类号： C01B13/32 , B22F9/22 , C01B13/20 , C01G39/02 , C01G41/02
摘要： PURPOSE:To obtain the titled ultrafine particles in a simple treating process without causing pollution, by replacing hydrogen with oxygen or a mixed gas of oxygen and an inert gas in production of ultrafine metallic particles by hydrogen plasma. CONSTITUTION:Hot plasma is generated in an atmosphere consisting of oxygen or a mixed gas of oxygen and an inert gas, e.g. Ar or He, and a high-melting metal or an oxide thereof having >=2,000 deg.C melting point is melted in the flame of the hot plasma. Thus, the ultrafine particulate high-melting metallic oxide having about =2,000 deg.C melting point can be obtained in a simple production process without causing pollution nor requiring strict control of treating conditions.

8. 发明专利

JPS63170212A PRODUCTION OF HYPER-FINE POWDER OF METAL BORIDE 失效
公开(公告)号：JPS63170212A
公开(公告)日：1988-07-14
申请号：JP110287
申请日：1987-01-08
申请人： NAT RES INST METALS
发明人： ONO SATORU , UDA MASAHIRO
IPC分类号： C01B35/04
摘要： PURPOSE:To easily obtain a hyper-fine powder of metallic boride having high purity with a simple device, by allowing a boride of a specified metal of a mixture of the metal and boron to heat, melt, evaporize and condense with a heat plasma generated in an atmosphere contg. hydrogen. CONSTITUTION:Groups Ia, IIa, IIIa, IVa, Va and VIa metal boride in the periodical table or the mixture of these metals and the boron 3 is put on a melting table 5 provided in a closed container 1, and then is melted and evaporized by the heat plasma 2 generating in the atmosphere of the hydrogen or the gaseous mixture of the hydrogen and an inert gas. Then the vapor of the metallic boride is cooled and condensed to the hyper-fine powder by the gas of the atmosphere introduced from the introducing opening 4. Then the super fine powder of the metallic boride (e.g. titanium boride) is obtained by transporting the above-mentioned powder to a collector 7 via a cooler 6 with the gas stream of the atmosphere and collecting. The hyper-fine powder is preferably used for a catalyst or an electronic material, etc.

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