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公开(公告)号：JPH0575277B2
公开(公告)日：1993-10-20
申请号：JP31419186
申请日：1986-12-29
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公开(公告)号：JPH05247607A
公开(公告)日：1993-09-24
申请号：JP8461392
申请日：1992-03-05
发明人： MARUYAMA MASAO , NAKAGAKI HIROSHI
摘要： PURPOSE:To improve the wear resistance and heat resistance of powdery high speed steel and to impart excellent toughness thereto by forming its structrue into a one contg. WC grains having specified grain size. CONSTITUTION:The compositional components of powdery high speed steel are incorporated with WC grains having 3 to 10mum grain diameter. Furthermore, the hard carbides or nitrides of Ta, Nb and Ti are made present in the powdery high speed steel. By forming the structure of the WC grains in the powdery high speed steel into a large one, an alloy improved in wear resistance and heat resistance as well as excellent in toughness can be obtd. It is made suitable as the material used for a guide roller or the like, and the expansion of the use of the powdery high speed steel can be expected.
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公开(公告)号：JPH0598383A
公开(公告)日：1993-04-20
申请号：JP29086991
申请日：1991-10-08
发明人： MARUYAMA MASAO , NAKAGAKI HIROSHI
IPC分类号： C22C1/05 , B22F5/00 , C22C29/06 , C22C29/08 , C22C29/10 , C22C32/00 , C22C33/02 , C22C38/00 , C22C38/18
摘要： PURPOSE:To provide a hard alloy excellent in wear resistance, corrosion resistance and toughness, high in hardness and free from the constraint of color tone. CONSTITUTION:In this alloy, NbC is used as base, Ni, TaC, Mo and Cr are blended, alloy density is regulated to 7.0 to 10.0g/cm as well as Vickers hardness is regulated to >=2 1000kg/mm and, preferably, the above NbC is incorporated by >=35wt.% and Cr by 1.0 to 3.0wt.%. Thus, it is lightweight and inexpensive comparted to the conventional cemented carbide using WC as a based, furthermore has strength higher than that of cermet and ceramics and shows color tone close to gold.
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公开(公告)号：JPH0559481A
公开(公告)日：1993-03-09
申请号：JP25043891
申请日：1991-09-02
IPC分类号： C22C29/08
摘要： PURPOSE:To improve the machinability, wear resistance and corrosion resistance of a sintered hard alloy by specifying Co, Mo, Mo2C, VC and WC and forming it of a hard phase consisting essentially of WC and contg. Mo, VC or the like and a bonding phase consisting essentially of Co. CONSTITUTION:This sintered hard alloy having high hardness is formed of a hard phase consisting essentially of WC having =14.8g/cm density, 2300kg/mm Vickers hardness and 3 fracture toughness value.
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公开(公告)号：JPH0559405A
公开(公告)日：1993-03-09
申请号：JP25043791
申请日：1991-09-02
摘要： PURPOSE:To reduce the Co content and to improve the wettability of WC-Co by mixing Mo or Mo2C and VC into a WC powder, forming and presintering the mixture and further sintering the resultant material by hot isostatic pressing in a high-pressure inert gas atmosphere. CONSTITUTION:The WC powder having =14.8 g/cm , the Vickers hardness to 2300kg/mm and the fracture toughness to >=3.0.
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公开(公告)号：JPH04198453A
公开(公告)日：1992-07-17
申请号：JP33324390
申请日：1990-11-28
发明人： MARUYAMA MASAO , SHIRANE YOSHINORI
摘要： PURPOSE:To obtain a sintered hard alloy excellent in wear resistance, hardness, and machinability by constituting this alloy of a hard phase consisting of carbides, etc., of group IVa, Va, and VIa metal elements and having specific grain size and a specific amount of binding phase consisting of iron group metals. CONSTITUTION:In a hard alloy which consists of a hard phase consisting of the carbide, nitride, and carbonitride of group IVa, Va, and VIa metal elements of the periodic table of elements and having =1800kg/mm and >=80kg/mm , respectively. By this method, the hard alloy excellent in wear resistance, hardness, and machinability as tool alloy can be obtained.
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公开(公告)号：JPH04160103A
公开(公告)日：1992-06-03
申请号：JP28793690
申请日：1990-10-24
发明人： MARUYAMA MASAO , MATSUMOTO HIDEKAZU
IPC分类号： C04B35/638 , B22F3/10 , C04B35/64
摘要： PURPOSE:To enable complete removal of grease of a binder and to improve the life of furnace members by mounting molded bodies comprising complete powder of hard metal or the like on a multistage high-density carbon plates before sintering and slowly heating the molded bodies to change the binder in the molded body into a liquid and discharge it to outside. CONSTITUTION:Molded bodies 3 comprising complete powder of hard metal or ceramics containing a binder are mounted on multistage high-density carbon plates 2 in a carbon case 1 in a vacuum, pressurized tank 4. The bodies 3 are slowly heated to change the binder into a liquid state which is then discharged from the tank 4. The carbon plate 2 consists of high-density carbon of about 1. 5-2.1g/cm or graphite material. It is preferable to provide plural sloped grooves 10 running to a hole 9 in the center part of the plate. The binder is paraffin, and preferably degreased and removed by slowly heating at about 1-100 deg.C/h rate.
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公开(公告)号：JPH04160101A
公开(公告)日：1992-06-03
申请号：JP28793590
申请日：1990-10-24
发明人： MARUYAMA MASAO , MATSUMOTO HIDEKAZU
IPC分类号： B22F1/00
摘要： PURPOSE:To obtain uniform molding material free from demixing of binder to the source powder for cemented carbide or cermet by using the binder dividing both into wet mixing process with the source powder and into kneading. CONSTITUTION:To the source powder of cemented carbide or cermet comprising carbide, nitride or carbide/nitride of group IVa, Va, and VIa metal elements and iron group metal elements, a binder is added by 1/20-1/2 of the total use amt. of the binder, and wet mixed and dried to obtain a premixture powder. This premixture powder and the residual binder, namely 19/20-1/2 of the total use amt. are mixed and kneaded. It is preferable that the source powder consists of a fine powder of about
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公开(公告)号：JPH03285039A
公开(公告)日：1991-12-16
申请号：JP8772990
申请日：1990-04-02
发明人： MARUYAMA MASAO , NAKAGAKI HIROSHI , ASAI TAKESHI
摘要： PURPOSE:To manufacture a sintered hard alloy material suitable for manufacturing a hot rolling roll, in a sintered hard alloy essentially consisting of WC and contg. Co, Ni and Cr, by specifying the grain size of a hard phase and the content of a bonding phase in the alloy and the content of Cr in the bonding phase. CONSTITUTION:In a sintered hard alloy essentially consisting of WC and contg. Co, Ni and Cr (where the content of WC is regulated to by weight, about 70 to 92%, the weight ratio of Co to Ni in the bonding phase is regulated to about 1:1 to 3.5:1 and the content of Cr is regulated to about 0.5 to 2.0%), the grain size of the hard phase in the alloy is regulated to 4 to 9mm average, the content of the bonding phase is regulated to 8 to 30% in the alloy and the Cr content in the bonding phase is regulated to 0.5 to 2.0%. Because the roll manufactured by using this sintered hard alloy is excellent in thermal characteristics and having improved strength and wear resistance, at the time of providing the surface with a caliber, cracks do not occur.
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公开(公告)号：JPS63252681A
公开(公告)日：1988-10-19
申请号：JP8631587
申请日：1987-04-08
发明人： CHIBA NOBUTAKA , KIKUCHI YOICHI , MATSUMURA HIROSHI , MARUYAMA MASAO , SEKI ATSUSHI , MINATO YOSHIHIRO , SAKATA TOSHIMITSU , MAEDA YOSHIKI
摘要： PURPOSE:To obtain the band parts for wrist watches easy in machining and excellent in dimensional accuracy by composing a work part by the material to be worked more excellent in machinability than the remaining base member and subjecting the material to be worked to joining with diffusion to the base member. CONSTITUTION:The material 3 to be worked is buried in the inner hole formed on the base 2 consisting of a sintered hard alloy on the work material 1 for wrist watch band. This work material 1 for wrist watch band buries a sintered material 3 to be worked into the hole of the base member 2 which is prior to sintering and after sintering the base member 2 it is obtd. by not isostatic pressing press forming. The material to be worked having excellent machinability is joined with diffusion joining and the material 3 to be worked is more excellent than the base member 2 in machinability, hence the band parts for wrist watch eacy in machining and excellent in dimensional accuracy are obtd.
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