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1. 发明专利

JPH0899306A CASTING MOLDING METHOD OF CERAMICS 失效
公开(公告)号：JPH0899306A
公开(公告)日：1996-04-16
申请号：JP25906594
申请日：1994-09-29
申请人： NIHON CEMENT
发明人： TSUTO HIROYUKI , SUZUKI ATSUSHI , FUKUDA EIJI , TSUKAMOTO KEIZO , TAKAHASHI SHIGERU
IPC分类号： B28B1/26
摘要： PURPOSE: To provide a pressure casting molding method of ceramics, which makes the density of a molded body uniform without enlarging the equipment. CONSTITUTION: In a molding method casting slurry comprised of ceramic powder and a solvent into a porous mold while pressurizing the slurry, molding is performed by a method wherein viscosity of the slurry is made to 50 poises or lower, pressure is made 1-5kg/cm , while the pressure after casting is made to vary 1kg/cm or more in a difference between the maximum value and minimum value.

2. 发明专利

JPH0782037A METHOD FOR CAST-MOLDING CERAMIC POWDER 失效
公开(公告)号：JPH0782037A
公开(公告)日：1995-03-28
申请号：JP17086093
申请日：1993-06-18
申请人： NIHON CEMENT
发明人： TSUTO HIROYUKI , ASAI YOSHIHIRO , FUKUDA EIJI , HAYASHI MUTSUO , YAMAGISHI SENJO
IPC分类号： B28B1/26 , C04B33/28 , C04B35/622 , C04B35/632
摘要： PURPOSE:To prevent the blinding of a mold by adding a non-aqueous emulsion as a binder to a ceramic powder slurry containing an organic solvent as a dispersing medium and subsequently cast-molding the obtained slurry. CONSTITUTION:100 pts.wt. of the powder of a ceramic raw material such as SiC or sialon having an average particle diameter of 0.3-1.0mum or the powdery materials containing the same as a main component is mixed with a prescribed amount of an organic solvent selected from methanol, isopropyl alcohol, xylene, etc., or, if necessary, the organic solvent containing approximately

3. 发明专利

JPH06321638A PREPARATION OF SLURRY FOR CAST FORMING OF BORON NITRIDE COMPOSITE CERAMICS 失效
公开(公告)号：JPH06321638A
公开(公告)日：1994-11-22
申请号：JP13274393
申请日：1993-05-11
申请人： NIHON CEMENT
发明人： ASAI YOSHIHIRO , TSUTO HIROYUKI , FUKUDA EIJI , TSUKAMOTO KEIZO , YAMAGISHI SENJO
IPC分类号： B28C1/04 , C04B33/28 , C04B35/00 , C04B35/58 , C04B35/583 , C04B35/622
摘要： PURPOSE:To prevent the occurrence of cracks in a sintered body by adding and water and a deflocculant to a powdery BN and kneading to prepare a slurry, mixing the slurry with another slurry of ceramics to prepare a slurry for BN-base composite ceramics. CONSTITUTION:Water and a deflocculant such as polycarboxylic acid ammonium are added, each in a specified amt., to a powdery BN of =40wt.% solid concn. Water and a deflocculant are added to another ceramic powder such as sialon and a sintering aid, and kneaded to prepare another slurry. Then the BN slurry and this ceramic slurry are mixed in a specified mixing ratio with a kneader to obtain a slurry for casting of BN-base composite ceramics with low concn. in which BN is uniformly dispersed. By using this slurry to cast, the molded body is heated, degreased and sintered in an N2 gas atmosphere to obtain a sintered body without cracks.

4. 发明专利

JPH0569424A CAST MOLDING OF CERAMIC 失效
公开(公告)号：JPH0569424A
公开(公告)日：1993-03-23
申请号：JP25864991
申请日：1991-09-11
申请人： NIHON CEMENT
发明人： TSUTO HIROYUKI , FUKUDA EIJI , TSUKAMOTO KEIZO , YAMAGISHI SENJO
IPC分类号： B01F13/06 , B28B1/26 , B28C1/04
摘要： PURPOSE:To prevent a rise in the viscosity of a ceramics powder slurry to which an acrylic emulsion is added as a binder at the time of the cast molding of said slurry. CONSTITUTION:An acrylic emulsion is added to and mixed with a ceramics powder slurry under stirring in a vacuum defoaming process before cast molding. By this method, the breakdown of the emulsion due to mill mixing is prevented and a rise in the viscosity of the ceramics powder slurry is not generated and no crack is generated in a cast molded product. Further, a binder mixing process is simplified.

5. 发明专利

JPH0526585A JIG FOR SINTERING CERAMICS FORMED BODY 失效
公开(公告)号：JPH0526585A
公开(公告)日：1993-02-02
申请号：JP20351291
申请日：1991-07-19
申请人： NIHON CEMENT
发明人： TSUTO HIROYUKI , FUKUDA EIJI , TSUKAMOTO KEIZO , YAMAGISHI SENJO
IPC分类号： C04B33/32 , F27D3/12
摘要： PURPOSE:To prevent the generation of bendings or variability of density upon sintering a bar type or a tubular continuous formed body by a method wherein a jig for sintering is provided with V-shaped grooves for preventing bending of formed bodies on the upper surface of the jig for sintering while the surface roughness of the surfaces contacting with the formed bodies on the grooves is specified to a specified value. CONSTITUTION:In a jig 1 for sintering, which is employed for the sintering of bar type or tubular ceramics, the surface roughness Ra of the jig contacting with a formed body 2 is specified so as to be lower than 10mum. The surface of the jig 1 for sintering, which is contacted with the formed body 2 of ceramics, is processed by the lining of the material powder of the formed body 2. The surface roughness of the sintering jig is small and smooth whereby the shrinkage of the formed body will never be hindered upon sintering. On the other hand, the lining is made of ceramics powder same as the material of the formed body and, therefore, reaction will never be caused between the formed body and the jig upon sintering.

6. 发明专利

JPH10203871A PRODUCTION OF SILICON CARBIDE-BASED SLIDING MATERIAL 失效
公开(公告)号：JPH10203871A
公开(公告)日：1998-08-04
申请号：JP1776997
申请日：1997-01-16
申请人： NIHON CEMENT
发明人： TSUTO HIROYUKI , SHIOGAI TATSUYA , YOSHIDA HIDETO
IPC分类号： F16C33/24 , C04B35/565 , C04B35/626
摘要： PROBLEM TO BE SOLVED: To produce a silicon carbide-based sliding material capable of solving such a problem that the silicon carbide-based sliding material has low mechanical strength and abrasion resistance because additives of low friction coefficients cannot be efficiently mixed with silicon carbide and is dispersed into the silicon carbide powder in heterogeneous condition only. SOLUTION: This production of a silicon carbide-base sliding material by adding graphite particles to silicon carbide powder, mixing them, molding the mixture, and sintering the molding comprises adding graphite particles having an average particle size of 20μm or less in the form of a graphite suspension to silicon carbide powder having an average particle size of 1μm or less so that the graphite suspension can be added in a quantity of 3-20wt.% of graphite to the silicon carbide, and mixing them.

7. 发明专利

JPH10147826A PRODUCTION OF METAL-CERAMICS COMPOSITE 失效
公开(公告)号：JPH10147826A
公开(公告)日：1998-06-02
申请号：JP31858896
申请日：1996-11-15
申请人： NIHON CEMENT
发明人： TSUTO HIROYUKI , YOSHIDA HIDETO
IPC分类号： F16D65/12 , C04B41/88 , C22C21/02 , C22C47/00 , C22C47/08 , C22C47/12 , C22C1/09
摘要： PROBLEM TO BE SOLVED: To reduce the weight of a metal-ceramics composite composed essentially of aluminum alloy and also to improve the heat resistance of this composite material. SOLUTION: This metal-ceramics composite can be produced by allowing an aluminum alloy as base material to penetrate into a preform constituted of ceramic fibers or grains as reinforcement. At this time, the aluminum alloy is an alloy prepared by incorporating >=10% Si and >=1% Mg into Al, and, as to the method for penetrating metal, the aluminum alloy melted at 700-850 deg.C is allowed to penetrate into the preform at >=50MPa pressure.

8. 发明专利

JPH09208349A METAL-CERAMIC COMPOSITE MATERIAL AND ITS PRODUCTION 失效
公开(公告)号：JPH09208349A
公开(公告)日：1997-08-12
申请号：JP3117996
申请日：1996-01-26
申请人： NIHON CEMENT
发明人： TSUTO HIROYUKI , MATSUMARU YOKO , YOSHIDA HIDETO
IPC分类号： C04B41/88
摘要： PROBLEM TO BE SOLVED: To obtain a metal-ceramic composite material high in strengths not only at the ordinary temperature but also at high temperatures by impregnating a preform using AlN particles having a prescribed maximum particle diameter as a reinforcing material with Al or its alloy by a high pressure cast method. SOLUTION: The maximum particle diameter of AlN particles herein used is 10-50μm. This method for producing this composite material comprises adding polyvinyl alcohol to the AlN powder having the maximum particle diameter of 50 or 10μm, drying the mixture, charging the dried mixture into a mold in a charging degree of 45% in the case of the maximum particle diameter of 50μm or in a charging degree of 55% in the case of the maximum particle diameter of 10μm, pressing the charged mixture with a pressure of 200kgf/cm for 3min to form a preform (100×50×15mm), cutting out a disk (diameter: 50mm, thickness: 15mm) from the preform, setting the disk in a columnar mold (diameter: 50mm, height: 50mm) for casting Al, separately charging an Al alloy (e.g. AC7A) into a graphite crucible for casting, thermally melting the alloy at 750 deg.C, pouring the melted alloy into the columnar mold and subsequently pressing the mold with a punch bar under a pressure of 50MPa for 3min.

9. 发明专利

JPH05294707A 失效
公开(公告)号：JPH05294707A
公开(公告)日：1993-11-09
申请号：JP11847692
申请日：1992-04-13
申请人： NIHON CEMENT
发明人： TSUTO HIROYUKI , FUKUDA EIJI , TSUKAMOTO KEIZO , YAMAGISHI SENJO
IPC分类号： B28B1/26 , C04B33/28 , C04B35/00 , C04B35/584 , C04B35/599 , C04B35/622 , C04B35/632
摘要： PURPOSE:To mold a powdery ceramic by the use of an organic solvent as a dispersing medium by using an alkyl based deflocculant and a polycarboxylic acid based deflocculant as a deflocculant at the time of molding. CONSTITUTION:The powdery ceramic is molded by using a powdery ceramic containing slurry made by adding each of the alkyl based deflocculant and polycarboxylic acid based deflocculant of 0.1-2.0wt.% to the powdery ceramic as the deflocculant into the organic solvent as the dispersing medium while these deflocculant have 240,000-20,000 molecular weight. In the molding method, the deterioration of strength of a sintered body caused by the reaction of the ceramic powder with water is prevented by using the slurry containing the organic solvent as the dispersing medium. In this case, the deflocculation effect of the ceramic powder is sufficiently exhibited by using the alkyl based deflocculant and the polycarboxylic acid based deflocculant jointly at the time of preparing the slurry.

10. 发明专利

JPH0412067A PRODUCTION OF CERAMIC COMPLEX 失效
公开(公告)号：JPH0412067A
公开(公告)日：1992-01-16
申请号：JP11133490
申请日：1990-04-26
申请人： NIHON CEMENT
发明人： HAKOSHIMA JIYUNICHIROU , AKIYAMA YUTAKA , TSUTO HIROYUKI , TSUKAMOTO KEIZO , SUZUKI KAZUNARI
IPC分类号： C04B35/80
摘要： PURPOSE:To extremely improve fracture strength and to prevent instant fracture, forming skeleton of form of molded article from knitted fabric of ceramic yarn impregnated with a ceramic slurry, putting the skeleton in a mold, subjecting ceramic to slip casting and burning the molded article. CONSTITUTION:A slurry of ceramic powder dispersed into a solvent is impregnated into knitted fabric of ceramic yarn to give an impregnated material, which is molded into a given shape and dried. Then the impregnated molded material is set in a mold and a slurry comprising the ceramic powder, the solvent and a binder is subjected to slip casting. Then the prepared molded article is de-fatted and burnt. In the above-mentioned process, when an organic solvent (e.g. n-hexane) having low surface tension is used as the solvent to from the slurry to be impregnated into the knitted fabric of the ceramic yarn, preferably ceramic can be packed into the interior of the yarn.

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