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41. 发明专利

JPH04139066A PRODUCTION OF HEXAGONAL COLUMNAR SILICON NITRIDE 失效
公开(公告)号：JPH04139066A
公开(公告)日：1992-05-13
申请号：JP26050190
申请日：1990-10-01
申请人： STK CERAMICS LAB , TOSHIBA CERAMICS CO
发明人： SUZUKI MASATAKA , KURONO NOBUHISA , YAMASHITA HAJIME , SAITO HAJIME
IPC分类号： C04B35/626 , C04B35/58 , C04B35/584
摘要： PURPOSE:To obtain hexagonal columnar silicon nitride at a good yield by mixing a transition metal, alkaline (earth) metal, and the metal selected from Al and Si or the compd. thereof at prescribed ratios with silica powder and heat- treating the mixture under specific conditions. CONSTITUTION:The powder mixture having =0.1cm/sec gas surface speed, by which the hexagonal columnar silicon nitride adequate to reinforce the composite material, etc., is obtd.

42. 发明专利

JPH0491226A PRODUCTION OF SILICON NITRIDE COATED FIBER 失效
公开(公告)号：JPH0491226A
公开(公告)日：1992-03-24
申请号：JP20671490
申请日：1990-08-06
申请人： STK CERAMICS LAB , TOSHIBA CERAMICS CO
发明人： SUZUKI MASATAKA , NAGASHIMA HIDEO , SAITO HAJIME , YAMASHITA HAJIME
IPC分类号： C01B21/068 , D01F9/08 , D01F11/00 , D06M11/00 , D06M11/77
摘要： PURPOSE:To obtain the title fibers useful for FRP, FRM, FRC, etc., having high strength and excellent thermal conductivity, by heating a mixture of silica powder, etc., and ceramic fibers in a mixed gas flow of a hydrocarbon gas and an ammonia gas at high temperature. CONSTITUTION:A mixture of silica powder or silicon source powder (e.g. fumed silica) consisting essentially of silica and ceramic fibers of silica and alumina or alumina ceramic fibers is heated in a mixed gas flow of a hydrocarbon gas and an ammonia gas at 1,200-1,700 deg.C to give the objective fibers.

43. 发明专利

JPH01286969A NOZZLE FOR WELDING USE 失效
公开(公告)号：JPH01286969A
公开(公告)日：1989-11-17
申请号：JP11332288
申请日：1988-05-10
申请人： STK CERAMICS LAB , TOSHIBA CERAMICS CO
发明人： SAITO HAJIME , NAGASHIMA HIDEO , MATSUSHITA JUNICHI
IPC分类号： C04B35/58 , B23K9/26 , B23K9/29
摘要： PURPOSE:To obtain a nozzle with prolonged service life, by making the nozzle hole part with a specific titanium boride ceramic sintered form and the nozzle base with a material having its thermal expansion coefficient similar to that of said sintered form. CONSTITUTION:The objective nozzle to made up of (A) the nozzle base 12 fitted at the tip of feed pipe for welding gas and (B) the nozzle hole part 11 connected to said base 12, for heating and emitting said welding gas. The component B is made with a TiB2 ceramic sintered form

44. 发明专利

JPH01278956A LOW MELTING POINT METAL TREATING DEVICE 失效
公开(公告)号：JPH01278956A
公开(公告)日：1989-11-09
申请号：JP10856888
申请日：1988-04-30
申请人： STK CERAMICS LAB , TOSHIBA CERAMICS CO
发明人： SAITO HAJIME , NAGASHIMA HIDEO , MATSUSHITA JUNICHI
IPC分类号： C04B35/58 , B22D41/00 , B22D41/08 , B22D41/54
摘要： PURPOSE:To improve Vickers hardness, break resistant strength, heat shock resistance, etc., of a nozzle and to extend the service life thereof by forming at least contacting part with low m.p. molten metal with boronizing titanium ceramic sintered body. CONSTITUTION:A low m.p. metal treating instrument 10 is composed of part, which is not brought into contact with the low m.p. molten metal, that is, a nozzle body 11 and a protecting layer 12. The protecting layer 12 is formed with the boronizing titanium ceramic sintered body arranging matrix layer, in which the boronizing material of at least one kind of metal selected from transition metals and titanium carbide are mixed and made to solid solution, between the boronizing titanium grains and having 5% porocity ratio. By this method, erosion of the nozzle body 11 caused by low m.p. metal is prevented and mixture of the raw material of the nozzle body 11 into the low m.p. metal is prevented.

45. 发明专利

JPH01183470A SINTERED CERAMIC OF TITANIUM BORIDE 失效
公开(公告)号：JPH01183470A
公开(公告)日：1989-07-21
申请号：JP617088
申请日：1988-01-14
申请人： STK CERAMICS LAB , TOSHIBA CERAMICS CO
发明人： SAITO HAJIME , NAGASHIMA HIDEO , MATSUSHITA JUNICHI
IPC分类号： C04B35/58
摘要： PURPOSE:To inhibit the formation of pores in the matrix layer between titanium boride particles sufficiently to increase the density and strength of the sintered products therefrom by forming a sintered product of such a structure as the matrix layer of nickel boride-titanium carbide solid solution are arranged between titanium boride particles. CONSTITUTION:The sintered product of titanium boride ceramic has such a structure as the matrix layer 30 of nickel boride-titanium carbide solid solution is arranged between titanium boride particles 20. The average particle size of the titanium boride particles is preferably 0.5-8 micrometers. The sintered product has more than 95% relative density.

46. 发明专利

JPH01115825A PRODUCTION OF ALKALI TITANATE FIBER 失效
公开(公告)号：JPH01115825A
公开(公告)日：1989-05-09
申请号：JP27212887
申请日：1987-10-28
申请人： STK CERAMICS LAB , TOSHIBA CERAMICS CO
发明人： SAITO HAJIME , NAGASHIMA HIDEO , FUKUOKA SEIICHI
IPC分类号： C01G23/00
摘要： PURPOSE:To produce the title fiber consisting of long fiber in good yield, by subjecting oxide or hydroxide of titanium containing a prescribed amount of alkali titanate seed crystal to hydrothermal reaction with an aqueous solution of alkali in an autoclave. CONSTITUTION:0.5-20wt.% alkali titanate seed crystal having same composition as the aimed alkali titanate fiber is added to TiO2 or Ti(OH)4 and the mixture is packed into an autoclave with an aqueous solution of alkali containing one or more kind of MOH, MNO3, MCO3 and M2SO4 (M is alkali metal) and heated to 250-400 deg.C and as necessary under conditions of the reaction pressure adjusted to >=50 atom to subject TIO2 or Ti(OH)4 to hydrothermal reaction with the aqueous solution of alkali.

47. 发明专利

JPH01114690A CRUCIBLE MADE OF HIGH THERMAL-SHOCK RESISTANT CORDIERITE 失效
公开(公告)号：JPH01114690A
公开(公告)日：1989-05-08
申请号：JP26930087
申请日：1987-10-27
申请人： TOSHIBA CERAMICS CO , STK CERAMICS LAB
发明人： SAITO HAJIME , NAGASHIMA HIDEO , FUKUI TAKEHISA
IPC分类号： F27B14/10
摘要： PURPOSE: To obtain a high quality metal product of a higher purity by using cordierite comprising oxides of magnesium, aluminum and silicon as material of a crucible for melting metal to mold it by a casting method. CONSTITUTION: A specified amount of cordierite of high purity comprising oxides of magnesium, aluminum and silicon with a particle size of 0.1-5 μm is mixed with an anion based dispersant, a PVA binder and a defoaming agent as additives to bring the concentration of a slurry to 49-65%. The slurry is cast into a gypsum mold as a water absorbing cast mold so that the moisture of the slurry is absorbed into a mold material. A solid object molded is dried by an air drying at 100 deg.C and baked at 1,300-1,444 deg.C to obtain a crucible with A=40 mm, an inner diameter B=25 mm and a thickness C=3 mm. 150 G of Gold or 300 G of copper is measured to be taken into the crucible, melted at a heating temperature of 1,200-1,300 deg.C by an oxygen-acetylene flame and then, the metal is cast into a mold. This ingot production process is repeated. The crucible made of the cordierite can withstand more than ten times of application as against the crucible made of carbon wearing out under four to five applications.

48. 发明专利

JPS63260900A PURIFICATION OF WHISKER 失效
公开(公告)号：JPS63260900A
公开(公告)日：1988-10-27
申请号：JP9448587
申请日：1987-04-17
申请人： STK CERAMICS LAB , TOSHIBA CERAMICS CO
发明人： SAITO HAJIME , NAGASHIMA HIDEO , URAKAWA TETSURO , SUZUKI MASATAKA
IPC分类号： C30B29/62 , C30B33/00
摘要： PURPOSE:To obtain a SiC whisker having high quality, by adding a dispersing agent to water suspension of whisker-containing product, stirring the mixture, allowing the mixture to stand in order to deposit by-product and SiO2 component, filtering and drying the recovered suspension and treating the resultant whisker with a liquid containing hydrofluoric acid in order to remove SiO2. CONSTITUTION:A dispersing agent such as oleic acid is added to the suspension obtained by dispersing a SiC whisker-containing product into water and the mixture is stirred and allowed to stand. Thereby almost granular and cluster-like by-product and glass beads-like SiO2 component are preferentially deposited. Then after the suspension separated from the precipitate is recovered and filtered, the filtered whisker is dried and the dried whisker is treated with a liquid containing hydrofluoric acid to remove the residual SiO2 component. As a result, impurities are almost removed in good efficiency to provide the SiC whisker having high quality.

49. 发明专利

JPS63206362A MANUFACTURE OF METAL DIBORIDE BASE CERAMICS 失效
公开(公告)号：JPS63206362A
公开(公告)日：1988-08-25
申请号：JP3547587
申请日：1987-02-20
申请人： STK CERAMICS LAB , TOSHIBA CERAMICS CO
发明人： MATSUSHITA JUNICHI , SAITO HAJIME , NAGASHIMA HIDEO
IPC分类号： C04B35/58

50. 发明专利

JPH0558736A PRODUCTION OF TITANIUM CARBIDE NITRIDE SINTERED BODY WITH HIGH TOUGHNESS AND HIGH STRENGTH 失效
公开(公告)号：JPH0558736A
公开(公告)日：1993-03-09
申请号：JP25472691
申请日：1991-09-05
申请人： SAITO HAJIME , STK CERAMICS LAB
发明人： SAITO HAJIME
IPC分类号： C04B35/56
摘要： PURPOSE:To obtain the subject sintered body excellent in toughness, strength, etc., by uniformly mixing a specified amt. of transition metal powder with a titanium carbide nitride powder, molding the mixed powder, and then sintering at specified temp. in a nonoxidizing atmosphere. CONSTITUTION:Uniform mixture of 95-70wt.% titanium carbide nitride powder and 5-30wt.% transition metal powder of 21-29 atomic number, (e.g. Ni powder, Fe powder) is molded into a desired form. This molded body is sintered at 1200-2000 deg.C in a nonoxidizing atmosphere (e.g. nitrogen atmosphere). By this method, the difference of coeffts. of thermal expansion in the granule interfaces can effectively be decreased by the mutual solid solution. of the titanium carbide nitride compd. and the transition metal, so that the thermal stress generating in the body can be decreased. Thereby, the obtd. objective titanium carbide nitride sintered body has excellent characteristics such as high toughness, high strength, etc.

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