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71. 发明专利

JPH04146102A MANUFACTURE OF MAGNETIC SHIELD BODY 失效
公开(公告)号：JPH04146102A
公开(公告)日：1992-05-20
申请号：JP26945090
申请日：1990-10-09
申请人： NIHON CEMENT
发明人： ISHII MAMORU , SHIMOJIMA HIROMASA , TSUKAMOTO KEIZO , YAMAGISHI SENJO
IPC分类号： C04B35/00 , B28B1/28 , B28B21/30 , C01G1/00 , C04B35/45 , C04B35/622
摘要： PURPOSE:To contrive an improvement in magnetic shield capacity by making density of a fired body high and uniform, by a method wherein centrifugal molding of slurry of raw material powder or its temporarily fired powder which becomes a high-temperature superconductor is performed and the obtained cylindrical molded body is fired. CONSTITUTION:Compounded raw material powder into a composition through which it becomes finally a high-temperature superconductor at a temperature of a liquid nitrogen or higher by performing firing or temporarily fired powder obtained by firing temporarily the raw material powder at a temperature lower than a firing temperature is made into slurry by dispersing into appropriate solvent such as water or an organic solvent such as acetone or alcohol. Then after the obtained slurry is cast into a template, the template is turned, the tubular inside is deposited with the slurry at a uniform thickness and centrifugal molding is performed. After the slurry is fixed, a turning of the template is suspended, the template is disassembled and a cylindrical molded body is taken out and dried. The obtained molded body is fired and made into a magnetic shield body. With this construction, the magnetic shield body which has uniform density and is superior in magnetic shield capacity is obtained.

72. 发明专利

JPH04144986A SINTERED COMPACT OF NON-OXIDE CERAMICS AND PRODUCTION THEREOF 失效
公开(公告)号：JPH04144986A
公开(公告)日：1992-05-19
申请号：JP26705090
申请日：1990-10-04
申请人： NIHON CEMENT
发明人： HAKOJIMA JIYUNICHIROU , AKIYAMA YUTAKA , TSUTO HIROYUKI , TSUKAMOTO KEIZO , SUZUKI KAZUNARI
IPC分类号： C04B35/599 , C04B35/58 , C04B41/87
摘要： PURPOSE:To improve oxidation resistance by slip casing an oxidation-resistant non- oxide ceramics, forming the surface layer, subsequently charging a non-oxide ceramics excellent in high temperature strength into the inside thereof, carrying out slip casing and sintering the resultant forming. CONSTITUTION:With a non-oxide ceramics powder excellent in oxidation resistance, e.g. sialon represented by the formula (Z is 0-4.2), an auxiliary agent such as an Sc2O3- Y2O3-based substance, a dispersant such as a polyacrylic acid salt, a binder such as PVA and a solvent such as water are blended to prepare a slip 1. Another slip 2 is prepared by admixing an auxiliary agent such as a Y2O3-Al2O3-based substance, a dispersant, a binder and a solvent with a non-oxide ceramics powder excellent in high temperature strength, e.g. sialon having a low Z value. The above-mentioned slip 1 is charged into a porous mold to form the surface layer and the slip existing in the inside part is subsequently removed. The slip 2 is then charged into the inside of the porous mold to carry out solid slip casting and the cast material is demolded to obtain a prescribed-shape composite molding. The resultant composite molding is then dried, defatted and baked, thus giving the objective sintered compact of the non-oxide ceramics.

73. 发明专利

JPH0442863A PREPARATION OF SIALON-SILICON CARBIDE COMPOSITE POWDER 失效
公开(公告)号：JPH0442863A
公开(公告)日：1992-02-13
申请号：JP14537490
申请日：1990-06-05
申请人： NIHON CEMENT
发明人： NISHI YOSHIJI , TSUKAMOTO KEIZO , SUZUKI KAZUNARI , YAMAGISHI SENJO
IPC分类号： C04B35/599 , C01B21/084 , C04B35/58
摘要： PURPOSE:To accelerate a reductive nitrogenization reaction and improve the toughness, etc., of a sintered product by adding silicon carbide powder to raw materials when SiO2 powder, Al2O3 powder and carbonaceous powder are mixed and subjected to the reductive nitrogenization reaction at a high temperature in a nitrogen-containing atmosphere. CONSTITUTION:Raw material powder comprising SiO2 powder, Al2O3 powder and carbonaceous powder is mixed with silicon carbide powder and then subjected to a reductive nitrogenization reaction in a heated nitrogen-containing atmosphere to prepare sialon.silicon carbide composite powder. Since the silicon carbide powder is added to the raw materials in the reductive nitrogenization reaction, the silicon carbide existing in the reaction system acts as a reaction- acceleration agent to accelerate the reductive nitrogenization reaction and sialon composite powder containing the homogeneously dispersed silicon carbide, whereby the sintered product of the composite powder has improved fracture toughness, strength, etc.

74. 发明专利

JPH0433383A MANUFACTURE OF PIEZOELECTRIC CERAMICS 失效
公开(公告)号：JPH0433383A
公开(公告)日：1992-02-04
申请号：JP13858090
申请日：1990-05-30
申请人： NIHON CEMENT
发明人： OKURA SADAKATSU , TSUKAMOTO KEIZO , FUKUDA EIJI , YAMAGISHI SENJO
IPC分类号： H01L41/187 , C04B35/00 , C04B35/49 , C04B35/495 , H01B3/12
摘要： PURPOSE:To obtain piezoelectric ceramics having high conversion efficiency with higher permittivity by mixing magnesium niobate containing specific particle size as material sources for niobium and magnesium with niobium compound and magnesium compound to be used. CONSTITUTION:In a method of manufacturing PbTiO3.PbZrO3.Pb(Mg1/3Nb2/3)O3 piezoelectric ceramics for mixing, temporarily baking, baking and polarizing niobium compound, magnesium compound, lead compound, titanium compound and zirconium compound, magnesium niobate (Mg1/3Nb2/3O2) containing 2mum or less of mean particle size as material sources for niobium and magnesium are mixed with the niobium compound and the magnesium compound. The mixing ratio is desirably ranged so that the total sum (M+N) of the magnesium niobate (MN) of the niobium compound (N) and the magnesium compound (M) is MN:(M+N)=80:20-60:40 (by weight %).

75. 发明专利

JPH03266480A MANUFACTURE OF PIEZOELECTRIC CERAMIC 失效
公开(公告)号：JPH03266480A
公开(公告)日：1991-11-27
申请号：JP6528190
申请日：1990-03-15
申请人： NIHON CEMENT
发明人： OKURA SADAKATSU , TSUKAMOTO KEIZO , YAMAGISHI SENJO
IPC分类号： C04B35/49 , C04B35/491 , C04B35/64 , H01B3/12 , H01L41/39
摘要： PURPOSE:To enable a piezoelectric ceramic obtained in an after burning process to be improved in both dielectric constant and conversion efficiency by a method wherein the calcined ceramic composition is ground into fine powder to homogenize. CONSTITUTION:In a piezoelectric ceramic manufacturing process in which material powder is compounded, mixed, calcined, burned, and polarized to be a piezoelectric composition, calcined powder is ground into fine powder using ceramic beads and then subjected to the following processes. Composite oxide material such as PbTiO3-PbZrO3 or PbTiO3-PbZrO3-Pb(Mg1/3Nb2/3)O3 is used as piezoelectric material. The compounded material powder is mixed and ground by a ball mill or the like, the ground powder is calcined in an atmosphere of high temperature, and then the calcined powder is ground into fine powder by the use of ceramic beads. By this setup, a piezoelectric ceramic material high in dielectric constant and conversion efficiency can be obtained.

76. 发明专利

JPH033300A MANUFACTURE OF MAGNETIC SHIELD 失效
公开(公告)号：JPH033300A
公开(公告)日：1991-01-09
申请号：JP13718589
申请日：1989-05-30
申请人： NIHON CEMENT
发明人： SHIMOJIMA HIROMASA , TSUKAMOTO KEIZO , YAMAGISHI SENJO
IPC分类号： H05K9/00
摘要： PURPOSE:To obtain an integral magnetic shield having no seam by coating metal of a shape to be magnetically shielded with organic compound solution of metal to become a superconductor at liquid nitrogen temperature or higher by baking, and baking it together with the metal. CONSTITUTION:As metals for forming oxide superconductor, the form of an organic compounds soluble in solvent is employed. Such metallic organic compounds include fatty acid salts such as naphthenate, octylate, stearate, etc., acetylacetate, alkoxide, etc., which are soluble in organic solvent and become metal oxide by baking. As the solvent of the above metallic organic compound, toluene, xylene, mineral spirit, buthanol, etc., are employed. A metal vessel is coated with the metallic organic compound solution. It is again coated with the solution after temporarily baking, steps of drying and temporarily baking are repeated, to enhance the density of oxide superconductor obtained by baking the coating film, and to prevent it from cracking, thereby preventing a leakage magnetic field.

77. 发明专利

JPH02255555A PRODUCTION OF HIGH DENSITY OXIDE SUPERCONDUCTOR 失效
公开(公告)号：JPH02255555A
公开(公告)日：1990-10-16
申请号：JP7516689
申请日：1989-03-29
申请人： NIHON CEMENT
发明人： SHIMOJIMA HIROMASA , TSUKAMOTO KEIZO
IPC分类号： C04B35/00 , C01G1/00 , C01G29/00 , C04B35/45 , H01B13/00
摘要： PURPOSE:To increase relative density and critical current density by impregnating an oxide superconducting base material with a soln. contg. a specified starting material blend and by carrying out drying, dewaxing and sintering. CONSTITUTION:A Ba-La-Cu-O or Ba-Y-Cu-O type oxide superconducting base material is impregnated with a soln. contg. 10-100g/l starting material blend having the same ratio among the metallic elements as the superconducting base material. The impregnated material is dried, dewaxed by heating to 400-600 deg.C and sintered at a temp. at which superconductivity is rendered. This temp. is decided according to the compsn. of the base material.

78. 发明专利

JPH02124718A PREPARATION OF BI-PB-SR-CA-CU TYPE OXIDE SUPERCONDUCTING FILM 失效
公开(公告)号：JPH02124718A
公开(公告)日：1990-05-14
申请号：JP27838388
申请日：1988-11-02
申请人： AGENCY IND SCIENCE TECHN , NIHON CEMENT
发明人： MIZUTA SUSUMU , KUMAGAI TOSHIYA , SHIMOJIMA HIROMASA , TSUKAMOTO KEIZO , YAMAGISHI SENJO
IPC分类号： C01G29/00 , C01G1/00 , C23C20/02 , H01B12/06 , H01B13/00 , H01L39/24
摘要： PURPOSE:To obtain the title oxide superconducting film contg. a large amt. of HTc phase by coating a soln. of organometallic compds. contg. Bi, Pb, Sr, Cr, and Cu in a solvent on a surface of a formed body of Ag, Au, or Pt, decom posing the orgnometallic compds. by heating, then half-melting the decomposed product by heating in the air. CONSTITUTION:A formed body having several mu thickness and consisting of Ag, Au, and Pt which is not oxidized at

79. 发明专利

JPH0283263A PRODUCTION OF SINTERED MATERIAL OF SILICON NITRIDE 失效
公开(公告)号：JPH0283263A
公开(公告)日：1990-03-23
申请号：JP23356888
申请日：1988-09-20
申请人： NIHON CEMENT
发明人： HAKOSHIMA JIYUNICHIROU , TSUKAMOTO KEIZO , YAMAGISHI SENJO
IPC分类号： C04B35/584 , C04B35/00 , C04B35/58 , C04B35/632
摘要： PURPOSE:To densify a molded article and to obtain a high-density sintered material by granulating slurry of Si3N4 powder and a specific binder by spray drying, subjecting the granules to cold press molding under hydrostatic pressure and then sintering. CONSTITUTION:A binder comprising polybutyl acrylate or a copolymer of the polybutyl acrylate and acetic acid and PVA as main components and having the weight ratio of polybutyl acrylate or the copolymer of polybutyl acrylate and acetic acid to PVA of (15:85)-(70:30) is used. Si3N4 powder is blended with 0.5-5wt.% calculated as solid content of the binder to give slurry, which is spray dried to give granules. Then the granules are subjected to cold press molding under hydrostatic pressure, defatted in air at a given temperature after the molding and successively sintered in a N2 or Ar gas. A high-density sintered material having low shrinkage factor is obtained by this method.

80. 发明专利

JPS6467829A MANUFACTURE OF SUPERCONDUCTING WIRE OR TAPE 失效
公开(公告)号：JPS6467829A
公开(公告)日：1989-03-14
申请号：JP22469587
申请日：1987-09-08
申请人： NIHON CEMENT
发明人： ISHII MAMORU , SHIMOJIMA HIROMASA , TSUKAMOTO KEIZO , YAMAGISHI SENJO
IPC分类号： B28B1/00 , H01B12/06 , H01B13/00 , H01L39/12
摘要： PURPOSE:To obtain a superconducting wire or tape with good quality and no open circuit or the like by melting a combination of a compound containing group II-A and group III-A elements and a compound containing copper, immersing a wire-shaped or tape-shaped metallic core material in this solution, lifting and quickly cooling it, then annealing it. CONSTITUTION:Rare earth metal elements such as Ca, Sr, Ba for II-A group elements of the periodic table and Sc, Y, La for III-A group elements are used, and oxide, carbonate, sulfate, nitrate, acetate or the like are used for a compound containing these elements and copper. A combination of them is melted in a conventional electric furnace or the like, a metallic core material is put in this solution, fine vibration is applied to remove air bubbles on the surface of the core material, it is wetted and stuck with the solution on the whole surface then lifted at the fixed speed. The lifted core material is quickly cooled in the air then put in the electric furnace at 800-950 deg.C and annealed for several hours and cooled. The productivity is thereby improved, a superconductor is fixed to the core material continuously and homogeneously, and a superconducting wire or tape with extremely excellent quality and no open circuit is obtained.

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