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1. 发明专利

JPH1123754A LOW RADIOACTIVE NUCLEAR FUSION REACTOR 失效
公开(公告)号：JPH1123754A
公开(公告)日：1999-01-29
申请号：JP18378797
申请日：1997-07-09
申请人： HITACHI LTD , JAPAN ATOMIC ENERGY RES INST
发明人： YASUTOMI YOSHIYUKI , SUZUKI YASUTAKA , NAKAGAWA MOROO , OKAMURA HISANOBU , ISHIYAMA SHINTARO
IPC分类号： G21B1/11 , G21B1/00 , G21B1/17
摘要： PROBLEM TO BE SOLVED: To eliminate the use of a copper alloy for a cooling path and to reduce electromagnetic force and radioactivity by heating and eliminating a section such as a carbon rod being inserted into a cooling plate that consists of ceramics. SOLUTION: For example, a tokamak type low radioactive nuclear fusion reactor has a cooling plate 6 where a cooling path 7 and a plasma opposing material 8 are provided in a vacuum container where reactor core plasma is sealed. The cooling plate 6 is formed, for example, by ceramics where silicon carbide is baked by hot press and has a high thermal conductivity and high insulation property, namely a thermal conductivity of 100 W/m.K or higher and an electrical resistivity of higher than 1 GΩ.cm. The cooling path 7 is formed, for example, by inserting a carbon rod in specific shape into oxidation atmosphere when baking the cooling plate 6 and performing heating and combustion in oxidation atmosphere. The plasma opposing material 8 is made of, for example, carbon/carbon composite and is brazed to the cooling plate 6 by a specific method after metallizing, for example, a Ti alloy to the inside of the cooling plate 6.

2. 发明专利

DE69322481T2 未知
公开(公告)号：DE69322481T2
公开(公告)日：1999-08-19
申请号：DE69322481
申请日：1993-09-01
申请人： HITACHI LTD
发明人： YASUTOMI YOSHIYUKI , MIYATA MOTOYUKI , KIKUCHI SHIGERU , SAITO YUKIO
IPC分类号： G01N27/04 , G01L1/20 , G01N33/38
摘要： To provide diagnosis of service life and maintenance requirements, a sintered ceramic body (1) which in use is subjected to stress and undergoes change with time as a result of the stress is provided with an electrically conductive element (2) in contact with the sintered ceramic material The element (2) has a measurable electrical resistance which increases in dependence on the change of the ceramic body. This permits information to be obtained about said change of said body. Measuring means (6) for the electrical resistance is connected to the conductive element (2). The electrically conductive element (2), as seen in cross-section, may comprise a bundle of elongate members such as fibers or whiskers.

3. 发明专利

DE69115992T2 未知
公开(公告)号：DE69115992T2
公开(公告)日：1996-05-23
申请号：DE69115992
申请日：1991-05-24
申请人： HITACHI LTD
发明人： SAKAI JUNJI , SOBUE MASAHISA , YASUTOMI YOSHIYUKI
IPC分类号： B28B1/26 , B28B7/34
摘要： In a casting method for manufacturing various types of ceramics products having an intricate configuration and a partly diversified wall thickness, such as compressor scroll blade and a screw rotor, by casting a slurry composed of ceramics, etc. in a mold (3, 7, 6), the improvement comprising an arrangement wherein the mold is partly or entirely formed of a flexible gel material (6) which can be melted by heating at a temperature lower than the boiling point of the dispersion medium, whereby the stresses generated when molding the product can be mitigated. Thus, the molding of a product having a high level of dimensional accuracy can be carried out with ease.

4. 发明专利

DE19654182A1 Grain oriented reaction sintered ceramic 未知
公开(公告)号：DE19654182A1
公开(公告)日：1997-07-03
申请号：DE19654182
申请日：1996-12-23
申请人： HITACHI LTD
发明人： KANAI TSUNEYUKI , MAEDA KUNIHIRO , CHIBA AKIO , YOSHIZAWA HIROYUKI , MIYATA MOTOYUKI , SAWAI YUICHI , YASUTOMI YOSHIYUKI
IPC分类号： C04B35/10 , C04B35/111 , C04B35/573 , C04B35/591 , C04B35/622 , C04B35/638 , C04B35/64 , C04B35/65 , C04B35/571
摘要： The reaction sintered ceramic has a crystal grain orientation (as determined by the pole figure method) in the direction of a given crystallographic orientation with an orientation degree corresponding to an F value of \- 0.5, a relative density of at least 95% and a residual starting material content of less than 1 vol.% in a composition for producing a preform. Also claimed are: (i) a ceramic component in which the above reaction sintered ceramic is used and which is a mobile or stationary blade or a burner for a gas turbine, a wear-resistant element in a nuclear power station or a counter-plasma element for use in a nuclear fusion reactor; and (ii) the production of a reaction sintered ceramic, comprising moulding a mixture of staring material powder particles, heat treating to obtain a preform and supplying the preform with a gaseous or liquid reactant required to produce the ceramic product during the sintering operation in which the chemical reaction is produced in a zone which is displaced to effect sintering of the preform.

5. 发明专利

DE3855544T2 未知
公开(公告)号：DE3855544T2
公开(公告)日：1997-03-27
申请号：DE3855544
申请日：1988-04-08
申请人： HITACHI LTD
发明人： YASUTOMI YOSHIYUKI , NAKAMURA KOUSUKE , KITA HIDEKI , SOBUE MASAHISA
IPC分类号： B32B18/00 , C04B35/591 , C04B35/65 , C04B35/80 , F16C33/04
摘要： Disclosed is a ceramic composite which comprises particles of at least one inorganic compound selected from the group consisting of a carbide, a nitride, an oxide, a boride, a silicide and an oxy-nitride and particles and whiskers of Si3N4, Si2N2O or SiO2. This ceramic composite is small in volume change on sintering and superior in heat resistance and besides can absorb thermal shock by its voids. It can be used as ceramic heaters, current collectors, commutators for starter motor and alternator and the like.

6. 发明专利

DE69120250T2 未知
公开(公告)号：DE69120250T2
公开(公告)日：1996-10-10
申请号：DE69120250
申请日：1991-03-18
申请人： HITACHI LTD
发明人： YASUTOMI YOSHIYUKI , WATAHIKI SEIJI , SAKAI JUNJI , CHIBA AKIO , MIYOSHI TADAHIKO , SOBUE MASAHISA
IPC分类号： C04B35/00 , C04B35/565 , C04B35/58 , C04B35/591 , C04B35/622 , C04B35/80 , C04B38/00 , C23C16/34 , C04B35/56 , C04B38/06 , C04B41/87
摘要： The present invention provides a composite ceramic structure of sintered ceramics having a porosity of 5 to 40 % by volume and, if necessary, a maximum pore size of 10 mu m or less comprising particles selected from the group consisting of grains and whiskers of at least one inorganic compound AB selected from the group consisting of carbides, nitrides, and oxides which are composed of an element A and an element B, where a difference in electronegativity between the element A and the element B is not higher than 1.7; or particles selected from the group consisting of grains and whiskers of an inorganic compound, between the components of which a difference in electronegativity is higher than 1.7, and having layers of the inorganic compound AB formed on the surfaces of said particles; where said particles are bonded one another with silicon nitride particles having an average particle size not more than 0.2 mu m. The composite ceramic structure is produced by sintering a shape composed of particles selected from the group consisting of grains and whiskers of at least one of the inorganic compound AB; or a shape composed of particles selected from the group consisting of grains and whiskers of an inorganic compound, between the components of which a difference in electronegativity is higher than 1.7, and having layers of the inorganic compound AB formed on the surfaces of said particles; in a gaseous atmosphere containing silicon and nitrogen to grow silicon nitride particles having an average particle size not higher than 0.2 mu m on the surfaces of said inorganic compound particles, thereby bonding said inorganic compound particles one another. A ceramic sintered shape highly accurate in dimension having a surface configuration which is a replica of the surface contour of a mold as a ceramic mechanical part of precision is also proveded.

7. 发明专利

DE3885140T2 未知
公开(公告)号：DE3885140T2
公开(公告)日：1994-03-31
申请号：DE3885140
申请日：1988-04-08
申请人： HITACHI LTD
发明人： YASUTOMI YOSHIYUKI , NAKAMURA KOUSUKE , KITA HIDEKI , SOBUE MASAHISA
IPC分类号： B32B18/00 , C04B35/591 , C04B35/65 , C04B35/80 , F16C33/04
摘要： Disclosed is a ceramic composite which comprises particles of at least one inorganic compound selected from the group consisting of a carbide, a nitride, an oxide, a boride, a silicide and an oxy-nitride and particles and whiskers of Si3N4, Si2N2O or SiO2. This ceramic composite is small in volume change on sintering and superior in heat resistance and besides can absorb thermal shock by its voids. It can be used as ceramic heaters, current collectors, commutators for starter motor and alternator and the like.

8. 发明专利

DE69120250D1 未知
公开(公告)号：DE69120250D1
公开(公告)日：1996-07-18
申请号：DE69120250
申请日：1991-03-18
申请人： HITACHI LTD
发明人： YASUTOMI YOSHIYUKI , WATAHIKI SEIJI , SAKAI JUNJI , CHIBA AKIO , MIYOSHI TADAHIKO , SOBUE MASAHISA
IPC分类号： C04B35/00 , C04B35/565 , C04B35/58 , C04B35/591 , C04B35/622 , C04B35/80 , C04B38/00 , C23C16/34 , C04B35/56 , C04B38/06 , C04B41/87
摘要： The present invention provides a composite ceramic structure of sintered ceramics having a porosity of 5 to 40 % by volume and, if necessary, a maximum pore size of 10 mu m or less comprising particles selected from the group consisting of grains and whiskers of at least one inorganic compound AB selected from the group consisting of carbides, nitrides, and oxides which are composed of an element A and an element B, where a difference in electronegativity between the element A and the element B is not higher than 1.7; or particles selected from the group consisting of grains and whiskers of an inorganic compound, between the components of which a difference in electronegativity is higher than 1.7, and having layers of the inorganic compound AB formed on the surfaces of said particles; where said particles are bonded one another with silicon nitride particles having an average particle size not more than 0.2 mu m. The composite ceramic structure is produced by sintering a shape composed of particles selected from the group consisting of grains and whiskers of at least one of the inorganic compound AB; or a shape composed of particles selected from the group consisting of grains and whiskers of an inorganic compound, between the components of which a difference in electronegativity is higher than 1.7, and having layers of the inorganic compound AB formed on the surfaces of said particles; in a gaseous atmosphere containing silicon and nitrogen to grow silicon nitride particles having an average particle size not higher than 0.2 mu m on the surfaces of said inorganic compound particles, thereby bonding said inorganic compound particles one another. A ceramic sintered shape highly accurate in dimension having a surface configuration which is a replica of the surface contour of a mold as a ceramic mechanical part of precision is also proveded.

9. 发明专利

DE68918473T2 未知
公开(公告)号：DE68918473T2
公开(公告)日：1995-02-09
申请号：DE68918473
申请日：1989-03-02
申请人： HITACHI LTD
发明人： YASUTOMI YOSHIYUKI , MIYOSHI TADAHIKO , SOBUE MASAHISA
IPC分类号： C04B35/65 , C04B35/80 , H01L41/187 , H05K1/03 , H01L41/18
摘要： Functional ceramic shaped articles resistant to oxidation and corrosion can be produced with high dimensional accuracy by mixing (i) particles (1) and/or fibers of at least one functional inorganic material selected from piezoelectric materials such as PbTiO3 and PbZrO3, dielectric materials such as TiO2 and MgTiO3, magnetic materials such as Fe, Co, and Ni, heat conductive materials such as diamond and CBN, catalytically active materials such as gamma -Al2O3 and zeolites, electron emissive materials such as W and Th-W, sensor materials such as NiO and FeO, and biological materials such as Al2O3 and apatite with (ii) particles of at least one of metals of groups III, IV, V, VI, and VIII of the periodic table, followed by shaping and reaction-sintering those mixtures.

10. 发明专利

DE68906928T2 未知
公开(公告)号：DE68906928T2
公开(公告)日：1993-09-23
申请号：DE68906928
申请日：1989-03-03
申请人： HITACHI LTD
发明人： YASUTOMI YOSHIYUKI , MIYOSHI TADAHIKO , SOBUE MASAHISA , YAMASHITA NOBUYUKI , NAGASE HIROSHI , TANNO KIYOHIKO , ARIMOTO SHOJI , JOORAKU FUMIO
IPC分类号： C04B35/584 , C04B35/58 , C04B35/581 , C04B35/65
摘要： The invention provides a conductor comprising a reaction-sintered body of a conductive nitride produced from a powder of at least one metal selected from Ti, Zr, V, Nb, Ta, Cr, Ce, Co, Mn, Hf, W, Mo, Fe, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Yb, Lu, Th and Ni, and a process for producing such conductor by heating a molding containing a metal powder in a nitriding gaseous atmosphere containing no CO gas.

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