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81. 发明专利

JP2002020171A BUTTERFLY VALVE 失效
公开(公告)号：JP2002020171A
公开(公告)日：2002-01-23
申请号：JP2000195802
申请日：2000-06-29
申请人： NIPPON STEEL CORP
发明人： MATSUBAYASHI SHIGEHARU , NOSE TETSUO , TSUYUKI AKIRA
IPC分类号： F16K1/22 , C04B35/584
摘要： PROBLEM TO BE SOLVED: To provide a butterfly valve excellent in thermal stability and mechanical stability and having durability over a long period of time. SOLUTION: This butterfly valve is obtained by fabricating a silicon nitride ceramic sintered compact, which is obtained by compacting the mixed powder consisting of 3-12 mass % oxides of one or more rare earth elements, 4-10 mass % polytype of aluminum oxide/nitride and/or 21R type sialon and the balance of substantially silicon nitride and sintering the obtained compact at 1,700-1,800 deg.C under 0.1-0.2 MPa in a gaseous nitrogen atmosphere.

82. 发明专利

JP2001311474A BUTTERFLY VALVE AND METHOD OF MANUFACTURING SAME 失效
公开(公告)号：JP2001311474A
公开(公告)日：2001-11-09
申请号：JP2000131650
申请日：2000-04-28
申请人： NIPPON STEEL CORP
发明人： MATSUBAYASHI SHIGEHARU , NOSE TETSUO , TSUYUKI AKIRA
IPC分类号： C04B35/584 , C04B35/591 , F16K1/22
摘要： PROBLEM TO BE SOLVED: To provide a heat and mechanical stabilities improved butterfly valve having durability enabling long life by solving the weak points which the previous ceramic butterfly valve posses and making of the same. SOLUTION: The butterfly valve is formed by a sintered material of silicon nitride substrate which comprises substantially β-Si3N4 phase, Si2N2O phase and Y2Si2O7 phase.

83. 发明专利

JP2001207247A IMMERSION MEMBER FOR HOT-DIP METAL COATING BATH 失效
公开(公告)号：JP2001207247A
公开(公告)日：2001-07-31
申请号：JP2000015487
申请日：2000-01-25
申请人： NIPPON STEEL CORP
发明人： MATSUBAYASHI SHIGEHARU , NOSE TETSUO , AKINAGA KAZUNARI
IPC分类号： C23C2/00
摘要： PROBLEM TO BE SOLVED: To provide a member for continuous molten bath, which is composed of a thermal-shock-resisting, high-toughness silicon nitride sintered compact excellent in high temperature strength and fracture toughness and combining high wear resistance, thermal shock resistance and economical efficiency. SOLUTION: The immersion member for hot-dip metal coating bath is constituted by coating at least a part of the immersion member for hot-dip metal coating bath with a silicon nitride ceramics containing 2-10 mass % chromium nitride and having a sintered density not lower than 95% of theoretical density. The coated part corresponds to the sliding part and/or torque transmission part of a bearing in the plating bath.

84. 发明专利

JPH09278529A WIRE ROLLING GUIDE ROLLER CONSISTING OF PARTICLE-DISPERSED SILICON NITRIDE-BASED BAKED BODY 失效
公开(公告)号：JPH09278529A
公开(公告)日：1997-10-28
申请号：JP10645296
申请日：1996-04-04
申请人： NIPPON STEEL CORP
发明人： NOSE TETSUO , NAKAJIMA KENJI , KURISU YASUSHI
IPC分类号： B21B39/14 , C04B35/584
摘要： PROBLEM TO BE SOLVED: To obtain a wire rolling guide roller excellent in abrasion resistance, defect resistance, etc., by constructing the guide with a particle-dispersed silicon nitride-based baked body in which Cr2 N particles having a high relative density and a specific average particle size are dispersed in a predetermined volume fraction. SOLUTION: This wire rolling guide roller consisting of a particle-dispersed silicon nitride-based baked body having >=99%, relative density and containing chromium nitride particles having 0.5-10μm average particle size and dispersed in 1-8% volume fraction is obtained by adding a baking assistant (e.g. powdery magnesium oxide) and a predetermined amount of powdery chromium nitride having 0.5-10μm average particle size to powdery silicon nitride, mixing and molding the mixture, then baking the molded body. The dispersed chromium-nitride particles remain in a silicon nitride baked body as hard dispersed particles after baking and have an effect to enhance abrasion resistance by enhancing hardness of the total baked body. Further, the chromium nitride particles have an effect to enhance destruction energy in destruction and have an action to enhance defect resistance by enhancing stiffness, heat and impact resistances.

85. 发明专利

JPH09278523A WIRE-MILL GUIDE ROLLER MADE OF SINTERED SILICON CARBIDE CONTAINING DISPERSED PARTICLE 失效
公开(公告)号：JPH09278523A
公开(公告)日：1997-10-28
申请号：JP10645196
申请日：1996-04-04
申请人： NIPPON STEEL CORP
发明人： NOSE TETSUO , NAKAJIMA KENJI , KURISU YASUSHI
IPC分类号： C04B35/565 , B21B27/02
摘要： PROBLEM TO BE SOLVED: To obtain a wire-mill guide roller having high abrasion resistance as well as chipping resistance. SOLUTION: This guide roller 1 for wire mill is made of a particle-dispersed sintered silicon carbide having a relative density of >=99% and containing titanium boride-hafnium boride solid solution particles expressed by Ti1-x Hfx B2 ((x) is 0.02-0.25), having an average particle diameter of 1-10μm and dispersed in a sintered silicon carbide (SiC) at a volume fraction of 20-70%. A guide roller 1 for wire mill having a texture containing Ti-Hf-B solid solution particles dispersed essentially in a silicon carbide phase is produced by this process. The produced guide roller has high abrasion resistance as well as chipping resistance and keeps extremely excellent reliability over a long period.

86. 发明专利

JPH08290974A SIALON SINTERED COMPACT EXCELLENT IN CORROSION RESISTANCE TO LIQUID SODIUM 失效
公开(公告)号：JPH08290974A
公开(公告)日：1996-11-05
申请号：JP11665995
申请日：1995-04-19
申请人： NIPPON STEEL CORP , DORYOKURO KAKUNENRYO
发明人： NOSE TETSUO , NAKAYAMA HIDEMI , HAYASHI KAZUNORI , KANO SHIGEKI , YOSHIDA HIDEKAZU , HIRAKAWA YASUSHI , TATE YOSHIAKI
IPC分类号： G21C13/08 , B01J19/02 , C04B35/599 , G21D1/00
摘要： PURPOSE: To obtain sialon sintered compact excellent in heat resistance, high- temperature strength and abrasion resistance and improved in corrosion resistance to liquid sodium by constructing the sintered compact from β'-sialon crystalline grains and grain boundary phase having a specific volume fraction and keeping the density of the sintered compact to a specific relative density. CONSTITUTION: This sialon sintered compact is obtained by adding fine powder of sintering auxiliaries of rare earth oxide, aluminum oxide, aluminum nitride, silicon oxide and magnesium oxide in an amount of

87. 发明专利

JPH08290971A SILICON NITRIDE SINTERED COMPACT EXCELLENT IN RESISTANCE TO CORROSION OF LIQUID SODIUM 失效
公开(公告)号：JPH08290971A
公开(公告)日：1996-11-05
申请号：JP11666095
申请日：1995-04-19
申请人： NIPPON STEEL CORP , DORYOKURO KAKUNENRYO
发明人： NOSE TETSUO , NAKAYAMA HIDEMI , HAYASHI KAZUNORI , KANO SHIGEKI , YOSHIDA HIDEKAZU , HIRAKAWA YASUSHI , TATE YOSHIAKI
IPC分类号： G21D1/00 , C04B35/584
摘要： PURPOSE: To obtain a silicon nitride sintered compact excellent in heat resistance, high-temperature strength and abrasion resistance and improved in corrosion resistance to liquid sodium by constructing the sintered compact from silicon nitride grains and a crystalline grain boundary of a specific volume fraction and keeping the density of the sintered compact to a specific relative density. CONSTITUTION: Powder of rare earth oxide, aluminum oxide, aluminum nitride, silicon oxide, magnesium oxide, etc., which are sintering auxiliaries in an amount of =4hr in the temperature-lowering step in sintering to crystallize boundary phase or gradually cooled at a temperature-lowering rate of 100 deg.C/hr in the same temperature range.

88. 发明专利

JPH07291721A METALLIC PARTICLE DISPERSED ALUMINUM OXIDE BASED SINTERED COMPACT AND PRODUCTION THEREOF 失效
公开(公告)号：JPH07291721A
公开(公告)日：1995-11-07
申请号：JP10623094
申请日：1994-04-22
申请人： NIPPON STEEL CORP
发明人： NOSE TETSUO
IPC分类号： C04B35/10 , C04B35/74 , C22C1/05 , C22C29/12
摘要： PURPOSE:To produce a metallic particle dispersed aluminum oxide-based sintered compact having high mechanical strength and high toughness and to provide its producing method. CONSTITUTION:The sintered compact is composed of 0.5-30wt.% alloy particle of at least one kind selected from elinver, inver, super inver, stainless inver, 42 nickel and covar having 0.05-30mum average particle diameter and dispersed in a matrix phase of substantially aluminum oxide. The sintered compact is produced by molding a mixed powder composed of 0.5-30wt.% alloy powder of at least one kind of elinver, inver, super inver, stainless inver, 42 nickel and covar having 0.05-30mum average particle diameter and the balance substantially the aluminum oxide powder and sintering in a vacuum or a gaseous hydrogen atmosphere at 1300-1420 deg.C.

89. 发明专利

JPH07267734A PARTICLE DISPERSED SILICON NITRIDE SINTERED COMPACT AND ITS PRODUCTION 失效
公开(公告)号：JPH07267734A
公开(公告)日：1995-10-17
申请号：JP6252794
申请日：1994-03-31
申请人： NIPPON STEEL CORP
发明人： NOSE TETSUO , HIROTOMI TADAYOSHI
IPC分类号： C04B35/584
摘要： PURPOSE:To produce a particle dispersed silicon nitride sintered compact excellent in density, mechanical strength and toughness at a low cost by compacting a powdery mixture contg. a rare earth metal oxide, MgO, Cr2N, SiC and Si3N4 in a specified ratio and sintering the resultant compact in an atmosphere of gaseous nitrogen. CONSTITUTION:A powdery mixture consisting of 1-8wt.% one or more kinds of rare earth metal oxides such as Y2O3, 1-8wt.% magnesium oxide, 1-8wt.% chromium nitride, 0.1-3wt.% silicon carbide and the balance silicon nitride with inevitably contained silicon oxide is compacted into a desired shape and the resultant compact is sintered in the temp. range of 1,450-1,650 deg.C by a gas pressure sintering method or other method in an atmosphere contg. gaseous nitrogen to produce the objective particle dispersed silicon nitride sintered compact. The average grain size of chromium nitride remaining as dispersed particles in the sintered compact is preferably regulated to the range of 0.5-10mum and that of silicon carbide is preferably regulated to the range of 0.01-0.2mum.

90. 发明专利

JPH064514B2 失效
公开(公告)号：JPH064514B2
公开(公告)日：1994-01-19
申请号：JP9398490
申请日：1990-04-11
申请人： NIPPON STEEL CORP
发明人： NOSE TETSUO , KUBO HIROSHI
IPC分类号： C04B35/584 , C04B35/58

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