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公开(公告)号：JPH11323401A
公开(公告)日：1999-11-26
申请号：JP14654298
申请日：1998-05-11
Applicant: AGENCY IND SCIENCE TECHN
Inventor： KOBAYASHI KEIZO , SUGIYAMA AKIRA , NISHIO TOSHIYUKI , OZAKI KOYO
Abstract: PROBLEM TO BE SOLVED: To densely compact a composite material at a low temp. by substituting a specified ratio of TiB2 in a composite material composed of a specified amt. of TiB2 , and the balance transition metals such as Fe, Ni, Co with Ti powder and B powder and executing mechanical alloying treatment. SOLUTION: The composite material contains >=50 wt.% TiB2 . By weight, 10 to 50% TiB2 phase to from hard phases are substituted with Ti powder and B powder. This raw material is subjected to mechanical alloying treatment. A dry type pulverizer can be utilized for this treatment, and a vibration-type ball mill or the like is preferably illustrated. The obtd. alloy powder is composed of TiB2 , Fe or the like micronized into a submicron size, Ti and B powder. Next, the powder is sintered and compacted. Moreover, the compacted body is subjected to heating treatment in a hydrostatic pressure, by which residual pores are perfectly removed to densify it. Furthermore, by executing rapid cooling after the heating, the size of crystal pasticles other than the hard phases can be micronized.
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公开(公告)号：JPH10279328A
公开(公告)日：1998-10-20
申请号：JP9807397
申请日：1997-03-31
Applicant: AGENCY IND SCIENCE TECHN
Inventor： TAJIRI KOJI , NISHIO TOSHIYUKI , IGARASHI KAZUO , OI YUTAKA
Abstract: PROBLEM TO BE SOLVED: To provide an aerogel firmly joined to a glass by dipping the glass on which the aerogel is to be produced in a soln. such as a hydrofluoric acid soln. capable of etching the glass surface, cleaning the glass, pouring a mixture liquid of the start source material for a wet gel onto the surface without exposing the glass surface to air to produce a wet gel, and then subjecting the wet gel to supercritical drying. SOLUTION: A glass is dipped in a soln. such as a hydrofluoric acid soln. or acid ammonium fluoride soln. which corrodes the glass surface, and then the glass is cleaned. Then without exposing the glass surface to air, a reaction liquid as an aerogel precursor is made to flow on the surface to cause gelation or polymn. on the glass surface to produce a wet gel adhered to the glass. Then the produced wet gel is subjected to supercritical drying. As for the reaction liquid as the aerogel precursor, for example, a mixture liquid of alkoxide silicate or its oligomer and water and alcohol is used, and if necessary, with addition of alkali or acid as a catalyst.
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公开(公告)号：JPH06227809A
公开(公告)日：1994-08-16
申请号：JP3474493
申请日：1993-01-29
Applicant: AGENCY IND SCIENCE TECHN
Inventor： TAJIRI KOJI , IGARASHI KAZUO , NISHIO TOSHIYUKI
IPC: C01B33/16 , C01B33/159
Abstract: PURPOSE:To readily obtain a silica aerogel in which the surface having characerstics different from those of the silica aerogel is coated with a metallic oxide over a wide range of density. CONSTITUTION:This method for coating the surface of a silica aerogel with a metallic oxide comprises immersing a wet gel of silica obtained by hydrolyzing a silicon alkoxide in an alcohol, then removing the misture in the alcohol, subsequently adding a metallic compound condensable with hydroxyl group on the surface of the silica thereto, condensing the metallic compound with the hydroxyl group, further removing the unreacted metallic compond and the subjecting the resultant wet gel to the supercritical drying treatment. This silica aerogel obtained by this method has the surface coated with the metallic oxide.
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公开(公告)号：JP2000160202A
公开(公告)日：2000-06-13
申请号：JP35206698
申请日：1998-11-25
Applicant: AGENCY IND SCIENCE TECHN
Inventor： KOBAYASHI KEIZO , SUGIYAMA AKIRA , NISHIO TOSHIYUKI , OZAKI KOYO
Abstract: PROBLEM TO BE SOLVED: To provide a method for producing an alloy improved in strength and excellent in recycling properties by suppressing the formation of brittle phases in an alloy composed of iron and chromium. SOLUTION: Iron and chromium powders are blended so as to control the content of chromium to 30 to 75 atomic % and are alloyed in a pressure reduced atmosphere by a mechanical alloying method to obtain a powdery mixture in a non-equilibrium state, and the powder is molded by executing electric heating at
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公开(公告)号：JPH09302425A
公开(公告)日：1997-11-25
申请号：JP14522496
申请日：1996-05-14
Applicant: AGENCY IND SCIENCE TECHN
Inventor： KOBAYASHI KEIZO , NISHIO TOSHIYUKI , OZAKI KOYO
Abstract: PROBLEM TO BE SOLVED: To provide a lightweight magnetic material by dispersing iron or iron-containing alloy into magnesium or magnesium alloy and also to provide a method for compacting this material. SOLUTION: A powder of magnesium or magnesium alloy and a powder of iron or iron-containing alloy are compounded by means of solid state diffusion to introduce high strain energy, by which a compounded material where the dispersion material is uniformly dispersed into the matrix is prepared. Further, in order to prevent the complete release of strain, the material is compacted at
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Patent Agency Ranking
公开(公告)号：JPH08232050A
公开(公告)日：1996-09-10
申请号：JP3554595
申请日：1995-02-23
Applicant: AGENCY IND SCIENCE TECHN , NIPPON STEEL CORP
Inventor： OZAKI KOYO , KOBAYASHI KEIZO , NISHIO TOSHIYUKI , SHINBARA TERUO
Abstract: PURPOSE: To produce a binder-free bulky (solid) material solidified by quick cooling and to extend the application range of the material. CONSTITUTION: This bulky material solidified by quick cooling is a bulky amorphous alloy composite material contg. particles having a higher m.p. than a stock alloy and alloy crystals finely dispersed in a body solidified by quick cooling and having a high rate of formation of an amorphous state and enhanced mechanical characteristics. When an alloy solidified by quick cooling is produced, an amorphous phase is dispersed in a body solidified by quick cooling by adding particles having a higher m.p. than a stock alloy to the stock alloy and combining them and the rate of formation of an amorphous state is increased. The objective bulky material solidified by quick cooling is produced in a shape not obtd. so far and the application range of the material is extended.
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公开(公告)号：JPH08198615A
公开(公告)日：1996-08-06
申请号：JP2134895
申请日：1995-01-13
Applicant: AGENCY IND SCIENCE TECHN
Inventor： TAJIRI KOJI , IGARASHI KAZUO , NISHIO TOSHIYUKI
IPC: C01B33/158 , C01B33/16
Abstract: PURPOSE: To produce silica aerogel having high transparency. CONSTITUTION: Isopropanol is substd. for the liq. phase of wet silica gel and supercritical drying is carried out using the isopropanol as a medium to produce the objective hydrophobic silica aerogel having high transparency. This silica aerogel is used as it is or heat treatment is further carried out at 300-600 deg.C for several hr in an oxidizing atmosphere, e.g. in the air to obtain hydrophilic silica aerogel having higher transparency than the hydrophobic silica aerogel.
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公开(公告)号：JPH05296662A
公开(公告)日：1993-11-09
申请号：JP12137692
申请日：1992-04-15
Applicant: AGENCY IND SCIENCE TECHN
Inventor： TAJIRI KOJI , IGARASHI KAZUO , NISHIO TOSHIYUKI
Abstract: PURPOSE:To improve a yield of production of aerogel during an ultra critical drying operation by a method wherein a thin protection plate of metal is arranged over an entire upper region of a dried item as well as a circumference just below a pipe of an upper lid in order to prevent liquid from various pipes fixed to the upper lid from being badly influenced. CONSTITUTION:A high pressure container for ultra critical drying operation is used for manufacturing a porous member having a high porosity without producing any shrinkage by removing liquid phase material in gel substances such as jelly composed of solid phase and liquid phase under higher temperature and higher pressure than those at the liquid phase critical point after the liquid phase is changed to a ultra critical fluid. Pipes 14 such as a fluid inlet or outlet pipe, a pressure gauge pipe and a safety valve pipe and the like are fixed to the upper lid 2 of the high pressure container. A disk-like metallic closing plate 17 is fixed to a rear surface of the upper lid 2 in order to prevent the uniform aerogel structure being dripped onto the upper part of the dried item within the container from the pipes 14 and then the liquid flowed down from the pipes 14 is prevented from being applied to the dried item.
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公开(公告)号：JPH1112661A
公开(公告)日：1999-01-19
申请号：JP18309597
申请日：1997-06-23
Applicant: AGENCY IND SCIENCE TECHN
Inventor： NISHIO TOSHIYUKI , KOBAYASHI KEIZO , OZAKI KOYO , SUGIYAMA AKIRA
IPC: C22B9/02
Abstract: PROBLEM TO BE SOLVED: To separate-refine metal base material in a short time by using a filter therefor under solid-liquid coexisting state, controlling the temp. and the pressure and removing impurities mixed at the time of recovering as solid phase or liquid phase components at half-melting temp. of the liquidus or lower. SOLUTION: A holding cylinder (c) (raw material holding vessel) and a filter (d) set at one end thereof are utilized, and a metal base material C intended to be recycled and refined is charged into the cylinder (c), and after forming the half-melting state by heating with a heater (b), pressure with a gas from a cylinder (f) for pressurizing is supplied in the cylinder (c) and only the liquid phase metal is allowed to pass through the filter (d). As metal base materials C, for refining e.g. Al-Si base, Mg-Zn base, Al-Fe base materials and the composite material of these metals and ceramics, etc., are mentioned. As composite materials, e.g. one containing ceramic grains of alumina as an impurity in the metal base material is mentioned.
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公开(公告)号：JPH09300063A
公开(公告)日：1997-11-25
申请号：JP14522396
申请日：1996-05-14
Applicant: AGENCY IND SCIENCE TECHN
Inventor： KOBAYASHI KEIZO , OZAKI KOYO , NISHIO TOSHIYUKI
Abstract: PROBLEM TO BE SOLVED: To make it possible to produce a practical member keeping the property peculiar to an amophous material and to obtain large effect to expand industrial use of the amorphous material by dispersing the amorphous into a bulk material thereby realizing high speed deformation. SOLUTION: The amorphous phase is mixed with ceramic powder and light element powder and dispersed wholy, and pressure-formation is executed at the temp. range of crystalization temp. or lower of the amorphous phase to execute the fast and precise deformation into the objective shape, and the bulk material in which the crystalized phase coexists with the amorphous phase is formed.
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