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公开(公告)号：JPH10130773A
公开(公告)日：1998-05-19
申请号：JP30575696
申请日：1996-10-30
Applicant: AGENCY IND SCIENCE TECHN
Inventor： YASUE KAZUO
Abstract: PROBLEM TO BE SOLVED: To provide a method of obtaining a sintered compact of a cast iron type high density powder free from pores, by a single process in the air without using a lubricant, by performing heating and pressurizing operations at and under low temp. and low pressure, respectively. SOLUTION: An iron-(iron carbide) type powder, prepared by rapidly solidifying a molten cast iron and practically free from free carbon, is used. A metal mold is filled with the powder, and heating is performed up to 500-700 deg.C and also pressurization is carried out, by which the iron carbide in a nonequilibrium state is decomposed to precipitate carbon at the surface of the powder. On the other hand, the resultant precipitated carbon is allowed to react with compound oxygen in an oxide layer at the surface of the powder to dissipate the oxide layer and to allow sintering among the grains of the packed powder to proceed. Further, by applying annealing to the resultant sintered compact, a high strength sintered compact can be obtained.
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公开(公告)号：JPH1068004A
公开(公告)日：1998-03-10
申请号：JP24411096
申请日：1996-08-27
Applicant: AGENCY IND SCIENCE TECHN
Inventor： YASUE KAZUO , U KOURI
Abstract: PROBLEM TO BE SOLVED: To provide a compacting method for a titanium alloy applicable even if a shape of an objective sintered body is complicated and furthermore capable of forming a sitered body having an approximately true density at a low cost. SOLUTION: Titanium or titanium alloy powder and low m.p. metal or alloy powder are uniformly mixed, which is filled into a compacting die, next, heated about to the temp. directly above the m.p. of a low m.p. metal or about to the temp. between the liquidus and solidus of the low m.p. alloy or about to the temp. directly above the liquidus and is compacted to form into an objective compacted body. This compacted body is held under pressure, and a melted low m.p. metal or alloy is infiltrated into the powdery boundaries of the titanium or titanium alloy. Then, an obtd. compacted body is sintered in an inert atmosphere or in a vacuum, by which the titanium or titanium alloy and the low m.p. metal or alloy are mutually diffused and alloyed.
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公开(公告)号：JPH06298533A
公开(公告)日：1994-10-25
申请号：JP10995393
申请日：1993-04-13
Applicant: AGENCY IND SCIENCE TECHN
Inventor： HORIUCHI TATSURO , SUGIYAMA TOYOHIKO , TAKASHIMA HIROO , YASUE KAZUO , USHIKI KENICHI
IPC: B01J13/00 , C01G23/04 , C01G23/053
Abstract: PURPOSE:To easily control the size of colloid particles and improve the quantum containment effect and transparency by diluting a titanium alkoxide with an alcohol and adding the solution to a strongly acidic water little by little. CONSTITUTION:A titanium alkoxide such as titanium isopropoxide is diluted with 5-50 times mol of an alcohol such as ethanol to obtain a dilute solution. The particle size of titanium oxide colloid can be controlled as necessary by varying the dilution degree or the concentration in the above process. The diluted solution is dropped into a strongly acidic water of pH
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公开(公告)号：JPH02236444A
公开(公告)日：1990-09-19
申请号：JP5627789
申请日：1989-03-10
Applicant: AGENCY IND SCIENCE TECHN , HIROSHIMA PREFECTURE
Inventor： YASUE KAZUO , NISHIO TOSHIYUKI , YAMADA YASUO , SUZUKI HIROSHI
Abstract: PURPOSE:To rapidly execute temp. control and to determine a constant-temp. transformation curve of high accuracy by using a cooling medium having a large cooling power and making transformation measurement by a non-contact type system using magnetic force. CONSTITUTION:A high-temp. heating furnace 19 is heated up to the austenite area of about 900 deg.C and a sample is hung by a stainless steel wire 22 down to the position shown by 8b and is fixed by means of a clip 23. After the sample is held for a prescribed period of time, the clip 23 is removed to allow the sample to fall into a salt bath. The falling time of this time is recorded by a photoelectric tube and is determined as the time for starting the measurement of a change in the magnetic force. The sample is immediately cooled and the constant- temp. transformation is started. The magnetism of the sample is increased by the transformation in such a manner and the loss of weight generated by attracting a magnet 2 is indicated on a balance 1 and is displayed on a recorder. Since the balance 1 is of an electromagnetic balance type, the position of a tray is not displaced in a vertical direction even if the load changes. the distance between the sample and the magnet 5 does not, therefore, change and the influence on the load is not affected. The constant-temp. transformation curve of the high accuracy is obtd. in this way.
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Patent Agency Ranking
公开(公告)号：JPH06298520A
公开(公告)日：1994-10-25
申请号：JP10995493
申请日：1993-04-13
Applicant: AGENCY IND SCIENCE TECHN
Inventor： HORIUCHI TATSURO , SUGIYAMA TOYOHIKO , TAKASHIMA HIROO , YASUE KAZUO , USHIKI KENICHI
Abstract: PURPOSE:To obtain a silica gel having improved optical characteristics by dispersing ultrafine TiO2 particles in SiO2 colloid, gelatinizing the colloid at a specific temperature and baking the gel. CONSTITUTION:Transparent TiO2 colloid is prepared by diluting 1mol of a Ti alkoxide such as Ti isopropoxide with 5-50mol of an alcohol such as ethanol and dropping the diluted solution under stirring into strongly acidic water such as hydrochloric acid of pH
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公开(公告)号：JPH06122038A
公开(公告)日：1994-05-06
申请号：JP30302592
申请日：1992-10-15
Applicant: AGENCY IND SCIENCE TECHN
Inventor： YASUE KAZUO , NISHIO TOSHIYUKI
Abstract: PURPOSE:To provide a vacuum molding process capable of manufacturing a casting cavity by forming a perfect film on a pattern in a simple process even for the pattern having thick and sharp parts. CONSTITUTION:Liquid resin for forming a film is coated on the surface of a pattern 23 and dried to form a non-permeable film 30 on the surface of the pattern 23, and a flask 33 is loaded on the film, and the refractory material powder 44 is packed in the flask. After the inside space of the flask 33 is evacuated, the porous pattern 23 is separated to make a casting cavity. In manufacturing the casting cavity where the non-permeable film 30 is coated on the surface of the pattern 23, the refractory material powder 44 is packed in the flask 33 loaded on the periphery of the film, the packed part is wrapped with the non-permeable film 45, the part where the refractory material is packed within the flask 33 is evacuated, and the part is separated from the pattern 23, the non-permeable film 30 to be coated on the surface of the pattern 23 is formed by coating the adhesive composed of the adhesive resin and drying it.
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公开(公告)号：JPH0641674A
公开(公告)日：1994-02-15
申请号：JP21820092
申请日：1992-07-24
Applicant: AGENCY IND SCIENCE TECHN
Inventor： YASUE KAZUO , NISHIO TOSHIYUKI
Abstract: PURPOSE:To manufacture cast iron in which graphite ms uniformly and finely dispersed into a matrix structure and excellent capable of easily obtaining a pearlitic matrix regardless of its thickness. CONSTITUTION:The melt of iron stock having, by weight, 2 to 6% carbon content and 0.8% or less silicon content is rapidly atomized and solidified to form cast iron powder contg. no free carbon, and after that, it is compacted and 15 then baked at 800 to 1000 deg.C for 1 to 3hr in a nonoxidizing atmosphere to manufacture the superfine graphite-contg. cast iron green compact.
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公开(公告)号：JPS63105907A
公开(公告)日：1988-05-11
申请号：JP25254686
申请日：1986-10-23
Applicant: AGENCY IND SCIENCE TECHN
Inventor： YASUE KAZUO , YAMADA YASUO , NISHIO TOSHIYUKI , KOSAKA MINEO
IPC: B22F9/08
Abstract: PURPOSE:To enable continuous production and to improve the productivity by vertically moving the oscillating surface of an ultrasonic oscillator submerged in a molten metal so that the molten metal is dipped up, atomized and scattered by emergence and submergence. CONSTITUTION:The upward oscillating surface 5a of the oscillating part 5 of an ultrasonic oscillator 4 placed under a crucible 2 for melting a metal is submerged in a molten metal 3 in the crucible 2 through the bottom 11 of the crucible 2 to carry out ultrasonic oscillation. The whole oscillator 4 including the oscillating part 5 is vertically moved by a vertical driving mechanism 8. The oscillator 4 and the mechanism 8 are displaced by a vertical regulating mechanism 9. The molten metal 3 is dipped up, atomized and scattered by the oscillating surface 5a and the resulting solidified fine metal powder is recovered by a recovering mechanism 10.
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公开(公告)号：JPS61221310A
公开(公告)日：1986-10-01
申请号：JP6267885
申请日：1985-03-26
Applicant: AGENCY IND SCIENCE TECHN
Inventor： YASUE KAZUO , NISHIO TOSHIYUKI , KOSAKA MINEO
IPC: B01J12/02 , B01J2/04 , B01J10/00 , B01J19/10 , B05B17/06 , B22F9/06 , B22F9/12 , C01B13/32 , C01B21/06 , C01B31/30 , C01F7/42
Abstract: PURPOSE:To produce pulverous powder of a metal or alloy which has the narrow range of a grain size distribution and is stable in grain shape by dispersing uniformly an inert gas or reducing gas fed into the melt of the metal or alloy into a fine foam state by making use of ultrasonic oscillation. CONSTITUTION:A wire-shaped melting material 11 made of the metal or alloy fed by feed rollers 12 is heated and melted by a heater 2. The melt thereof is stored in a channel part 4 in a crucible 3. The inert gas or reducing gas such as Ar or H2 is then supplied from a gas supply part 10a of a gas flow passage 10 to pouring basin part 5. A horn 8 is vertically oscillated by an ultrasonic oscillation device 7 at the same instant. Then the above-mentioned gas is sheared to fine foam in the stage of passing through a space 9. The foam disperses and rises in the channel part 4. Cavitation is induced in the foam by the ultrasonic oscillation at the focus of the recessed surface 8a of the horn 8, by which the melt is atomized. The mist thereof is sucked by a water cooled impeller 15 rotating at a high speed, by which the mist is solidified. The solidified metal is recovered as the pulverous powder into a casing 16.
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