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公开(公告)号：US5066438A
公开(公告)日：1991-11-19
申请号：US455034
申请日：1989-12-22
Applicant: Michitaka Sato , Hiroaki Nishio
Inventor： Michitaka Sato , Hiroaki Nishio
IPC: C04B35/593
CPC classification number: C04B35/593
Abstract: A method of producing a silicon nitride sintered body which comprises using an amorphous Si.sub.3 N.sub.4 powder having a mean particle size of 5 to 50 nm, a nitrogen content of 30 to 39 wt. %, an oxygen content of 1 to 10 wt. %, the sum of the nitrogen content and the oxygen content being 38 to 42 wt. % and an unavoidable impurities content of less than 500 ppm as the raw material to form a molded body, sealing the molded body in a capsule and treating it with HIP in the range of 1000.degree. to 1800.degree. C. and 1000 to 2000 atm until the density becomes 3.1 to 3.4 g/cm.sup.3. In the method of the invention, active surface energy of silicon nitride powder is utilized as the driving force for sintering due to using a super fine powder. The super fine powder improves sintering ability by uniform mixing. The sintering ability is further improved by substituting a suitable amount of the nitrogen in the silicon nitride with oxygen. By the above means, the sintering strength can be secured under not severe sintering conditions. As a result, a sintering aid can be omitted.
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公开(公告)号：US5021213A
公开(公告)日：1991-06-04
申请号：US540555
申请日：1990-06-20
Applicant: Hiroaki Nishio , Akira Kato , Michitaka Sato , Keiji Watanabe
Inventor： Hiroaki Nishio , Akira Kato , Michitaka Sato , Keiji Watanabe
IPC: B22F3/10 , B22F3/12 , B22F3/22 , B28B1/00 , B28B1/26 , B28B7/34 , C04B35/634 , C04B35/636 , C04B35/638
CPC classification number: C04B35/63416 , B22F3/1021 , B22F3/125 , B22F3/22 , B28B1/00 , B28B1/26 , B28B7/342 , C04B35/634 , C04B35/6342 , C04B35/6365 , C04B35/638 , C04B2235/483
Abstract: In the method of invention, the formability is imparted to the slurry of a metal or ceramic powder by employing a porous mold and removing the dispersion medium through the evaporation or thermal decomposition thereof, or by using a silazane oil as the dispersion medium and curing it by heating. Since the phase change usually accompanying volume change does not occur in the dispersion medium, strain and deformation rarely occur in the molded body. As result, the sintered body obtained has high dimensional accuracy.
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公开(公告)号：US4761264A
公开(公告)日：1988-08-02
申请号：US61896
申请日：1987-06-12
Applicant: Hiroaki Nishio , Jun Harada
Inventor： Hiroaki Nishio , Jun Harada
CPC classification number: B22F3/1233 , B22F3/04 , B30B11/001 , Y10S264/78 , Y10S425/014
Abstract: A method for molding powders which comprises introducing a thin-wall resilient mold inside a ventilative mold support, reducing the outside pressure of the ventilative mold support to less than the atmospheric pressure (760 Torr), putting a thin-wall resilient mold exactly close to the inside wall of the ventilative mold support, supplying powder material into the thin-wall resilient mold, exhausting air existing in the voids formed in the powder material, and taking the ventilative mold support apart to apply cold isostatic press treatment to the thin-wall resilient mold. The shape of the thin-wall resilient mold is similar to the shape of the ventilative mold support.
Abstract translation: 一种用于模制粉末的方法，其包括将薄壁弹性模具引入通风模具支架内，将通气模具支架的外部压力降低到小于大气压力（760托），将薄壁弹性模具精确地接近 通风模具支撑的内壁，将粉末材料供应到薄壁弹性模具中，排出存在于粉末材料形成的空隙中的空气，并将通风模具支架分开，以对冷壁进行冷等静压处理 弹性模具。 薄壁弹性模具的形状类似于通风模具支架的形状。
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公开(公告)号：US4427529A
公开(公告)日：1984-01-24
申请号：US360064
申请日：1982-03-22
Applicant: Hiroaki Nishio
Inventor： Hiroaki Nishio
CPC classification number: C10G1/02
Abstract: A method for distilling shale oil from oil shale, which comprises: supplying an oil shale together with a granular heat medium heated to a prescribed temperature in a heating furnace to a distiling furnace, where a gas containing a gaseous shale oil, hydrogen and carbon monoxide is separated by vaporization from said oil shale through heat exchange with said granular heat medium; separating the liquid shale oil from said gas, separating said granular heat medium from the waste oil shale after separation of said gas; and then, feeding back said granular heat medium into said heating furnace to reheat said heat medium again to said prescribed temperature and to use said heat medium in recycle. In said method, said granular heat medium comprises manganese oxides and iron oxides. The heat of said granular heat medium is replenished with the heat produced by exothermic reaction of said hydrogen and said carbon monoxide contained in said gas with Mn.sub.2 O.sub.3 contained in said granular heat medium and reducing by means of said hydrogen and said carbon monoxide contained in said gas, Fe.sub.2 O.sub.3 contained in said granular heat medium into Fe.sub.3 O.sub.4 and Fe to impart magnetism to said granular heat medium; and, magnetically separating said granular heat medium from said waste oil shale.
Abstract translation: 一种用于从油页岩中蒸馏页岩油的方法，包括：将油页岩与加热炉中加热到规定温度的颗粒状热介质一起供给到蒸馏炉，其中含有气态页岩油，氢气和一氧化碳 通过与所述颗粒状热介质的热交换从所述油页岩中蒸发而分离; 将液体页岩油与所述气体分离，在分离所述气体之后将所述颗粒状热介质与废油页岩分离; 然后将所述颗粒状热介质反馈到所述加热炉中，以再次将所述热介质再次加热到所述规定温度，并使用所述热介质进行再循环。 在所述方法中，所述粒状热介质包括氧化锰和氧化铁。 所述颗粒状热介质的热量由所述氢气和所述气体中所含的一氧化碳与所述颗粒状热介质中所含的Mn 2 O 3的放热反应产生的热量补充，并通过所述氢气和所述气体中所含的一氧化碳还原 ，所述粒状热介质中含有Fe 2 O 3，Fe 3 O 4和Fe，赋予所述粒状热介质磁性; 并且从所述废油页岩磁分离所述颗粒状热介质。
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公开(公告)号：US5188793A
公开(公告)日：1993-02-23
申请号：US564492
申请日：1990-08-08
Applicant: Hiroaki Nishio
Inventor： Hiroaki Nishio
IPC: B22F3/10 , C04B35/632 , C04B35/638
CPC classification number: C04B35/632 , B22F3/1025 , C04B35/638
Abstract: A dewaxing method of a metal and/or ceramic molded body which comprises immersing the metal and/or ceramic molded body formed through a plastic molding in a boiling solvent to extract the dispersion medium contained in the molded body with said solvent. According to the method of the invention, the dewaxing time can be shortened from about 150 hours to the sum of about 54 hours for the solvent extraction and about 11 hous for dewaxing under heating. The dewaxed molded body is a sound body containing no crack nor expansion.
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Patent Agency Ranking
公开(公告)号：US4943403A
公开(公告)日：1990-07-24
申请号：US872398
申请日：1986-06-10
Applicant: Tsuneo Miyashita , Hiroaki Nishio , Michitaka Sato
Inventor： Tsuneo Miyashita , Hiroaki Nishio , Michitaka Sato
CPC classification number: C04B35/638 , B01D11/0203 , B22F3/1025
Abstract: There is disclosed a method for eliminating an organic dispersion medium from a molded product obtained by plasticizing-molding or casting-molding of metallic and/or ceramic powders wherein the elimination is by extraction by liquid carbon dioxide at a temperature not lower than -30.degree. C. and not higher than -31.1.degree. C. The method prevents nonuniform volumetric decrease of the molded product to be otherwise caused by the extraction of the organic dispersion medium, while also making it possible to completely eliminate the organic dispersion medium without causing residual strain or deformation in the molded product.
Abstract translation: 公开了一种通过对金属和/或陶瓷粉末进行增塑成型或浇铸成型而得到的成型体中除去有机分散介质的方法，其中通过在不低于-30℃的温度下用液态二氧化碳进行萃取 C.并且不高于-31.1℃。该方法可防止成型产品的不均匀体积减少，否则由提取有机分散介质引起，同时也可以完全消除有机分散介质而不产生残余应变 或模制产品中的变形。
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公开(公告)号：US4850575A
公开(公告)日：1989-07-25
申请号：US202716
申请日：1988-06-03
Applicant: Hiroaki Nishio , Takeshi Kawashima
Inventor： Hiroaki Nishio , Takeshi Kawashima
IPC: C04B35/64 , B22F3/14 , B22F3/15 , C04B35/645 , F27B17/00
CPC classification number: B30B11/002 , B22F3/15
Abstract: An apparatus for manufacturing a sintered body with high density comprises: a table having an object to be processed laid thereon; a pressure vessel accommodating a heat element heating the object around and a heat-insulating mantle surrounding the heat element; supply device for supplying to the pressure vessel an extractant which extracts a binder or a dispersion medium contained in the object, exhaust device for exhausting the extractant and an extracted substance from the pressure vessel; pressure device for raising a pressure in the pressure vessel, and vacuum means for evacuating the pressure vessel. The apparatus enables carrying out the three steps of drying or degreasing, sintering and hot isostatic pressing of the object once put in the pressure vessel without handling the object outside the vessel. The object is formed as a compact in the preprocess in advance of being put in the apparatus.
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公开(公告)号：US4676949A
公开(公告)日：1987-06-30
申请号：US907980
申请日：1986-09-16
Applicant: Tsuneo Miyashita , Hiroaki Nishio
Inventor： Tsuneo Miyashita , Hiroaki Nishio
CPC classification number: B22F3/1003 , B22F1/0059 , C22C33/0235 , B22F2003/023
Abstract: A tetrafluoroethylene-type fluoroplastic powder is added and mixed with a metal powder and the mixture is shaped. The compact is heated in a nonoxidizing atmosphere and the oxides on the surface of the metal particles are converted and removed as gaseous fluorides. Alternatively, after the oxides are converted to solid or liquid fluorides, the fluorides are reduced by hydrogen and then they are removed as gaseous reaction products. Thereafter, the compact is sintered.
Abstract translation: 加入四氟乙烯型氟塑料粉末并与金属粉末混合，并将混合物成形。 在非氧化气氛中加热压块，并将金属颗粒表面上的氧化物作为气态氟化物转化和除去。 或者，在将氧化物转化为固体或液体氟化物之后，氟化物通过氢气还原，然后作为气态反应产物除去。 之后，将该压块烧结。
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公开(公告)号：US5633214A
公开(公告)日：1997-05-27
申请号：US494959
申请日：1995-06-26
Applicant: Hiroaki Nishio , Hiroyuki Yoshida
Inventor： Hiroaki Nishio , Hiroyuki Yoshida
IPC: C01B21/064 , C01B21/072 , C04B35/583
CPC classification number: C01B21/0645 , C01B21/064 , C04B35/583 , C01P2004/61 , C01P2006/10 , C01P2006/14
Abstract: A boron-nitride-containing material of multi-component system is obtained at a low cost by heating a mixed powder containing a boride and an oxide in a nitrifying atmosphere, whereby a part or the whole of the oxide is reduced with the element bonded to boron of the boride to convert the raw materials to one or more kinds of an oxide having less bonded oxygen, an acid nitride, a nitride, a carbide, and a boride and also boron nitride is formed. A sintered product of a boron-nitride-containing material is obtained by packing a mixed powder containing borides in a heat-resistant mold and heating the packed powders in a nitrifying atmosphere while restraining the packed powders by the mold. The sintered product is obtained in which neither expansion nor deformation occurred and no cracks formed.
Abstract translation: 通过在硝化气氛中加热含有硼化物和氧化物的混合粉末，以低成本获得含有氮化硼的材料，由此一部分或全部氧化物被还原，元素结合到 硼化物的硼，将原料转化成一种或多种具有较少结合氧的氧化物，氮化物，氮化物，碳化物和硼化物，并且还形成氮化硼。 含氮化硼材料的烧结体是通过在耐热模具中填充含有硼化物的混合粉末，并且在通过模具抑制填充粉末的同时在硝化气氛中加热填充粉末而得到的。 获得了既不膨胀也不发生变形并且不形成裂纹的烧结体。
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公开(公告)号：US5250242A
公开(公告)日：1993-10-05
申请号：US623452
申请日：1990-12-18
Applicant: Hiroaki Nishio , Keiji Watanabe , Michitaka Sato
Inventor： Hiroaki Nishio , Keiji Watanabe , Michitaka Sato
CPC classification number: C04B41/009 , C04B35/6455 , C04B41/5025 , C04B41/52 , C04B41/87 , C04B41/89
Abstract: A method of producing a ceramic sintered body having a ceramic membrane which comprises a process of applying a precursor capable of converting into a ceramic membrane having a new function through heating onto at least a portion of a ceramic porous body to impart said function of the surface of the ceramic porous body, a process of applying a precursor capable of converting into a gas-impermeable membrane through heating over the whole surface of the porous body, a process of forming the gas-impermeable membrane by heating, a process of conducting hot isostatic pressing to the porous body, and a process of removing said gas-impermeable membrane. Ceramic sintered bodies having a dense ceramic membrane on the surface can be produced efficiently in very short processes.
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