HITACHI POWDERED METALS CO., LTD. Patent applications |
Patent application number | Title | Published |
20140273325 | THERMOELECTRIC CONVERSION MODULE AND PRODUCTION METHOD THEREFOR - A production method for a thermoelectric conversion module having a thermoelectric conversion element and an electrode, which are metallurgically bonded together via a porous metal layer. The porous metal layer is made of nickel or silver and has a density ratio of 50 to 90%. | 09-18-2014 |
20130251585 | SINTERED ALLOY AND PRODUCTION METHOD THEREFOR - A sintered alloy has an overall composition consisting of, by mass %, 13.05 to 29.62% of Cr, 6.09 to 23.70% of Ni, 0.44 to 2.96% of Si, 0.2 to 1.0% of P, 0.6 to 3.0% of C, and the balance of Fe and inevitable impurities; a metallic structure in which carbides are precipitated and uniformly dispersed in an iron alloy matrix having dispersed pores; and a density of 6.8 to 7.4 Mg/m | 09-26-2013 |
20130101244 | OIL-IMPREGNATED SINTERED BEARING AND PRODUCTION METHOD THEREFOR - An oil-impregnated sintered bearing which does not tend to produce squealing noises is provided. The oil-impregnated sintered bearing can be used as a bearing of an electric motor that may be intermittently used for a short time, such as a bearing of a window regulator motor. The oil-impregnated sintered bearing includes pores that include middle-sized pores with circle-equivalent diameters of 45 to 63 μm at 0.9 to 2.5%, interparticle pores with circle-equivalent diameters of 63 to 75 μm at 0.1 to 1.2%, and large interparticle pores with circle-equivalent diameters of larger than 75 μm at not more than 3%, with respect to the total number of the pores. | 04-25-2013 |
20130093131 | SINTERED COMPOSITE SLIDING PART AND PRODUCTION METHOD THEREFOR - A process for producing a sintered composite sliding part having an outer member made of an Fe-based wear resistant sintered member in which a hard phase is dispersed in a matrix at 15 to 70% by volume and an inner member made of a stainless ingot steel. The matrix is made of an Fe-based alloy including 11 to 35% by mass of Cr, and the hard phase is formed by precipitating and dispersing at least one selected from the group consisting of intermetallic compounds, metallic silicides, metallic carbides, metallic borides, and metallic nitrides in an alloy matrix made of at least one selected from the group consisting of Fe, Ni, Cr, and Co. The outer member is formed with a hole, the inner member is closely fitted into the hole, and the outer member and the inner member are diffusion bonded together. | 04-18-2013 |
20130091986 | HARD PHASE FORMING ALLOY POWDER, WEAR RESISTANT SINTERED ALLOY, AND PRODUCTION METHOD FOR WEAR RESISTANT SINTERED ALLOY - A hard phase forming alloy powder, for forming a hard phase dispersed in a sintered alloy, consists of, by mass %, 15 to 35% of Mo, 1 to 10% of Si, 10 to 40% of Cr, and the balance of Co and inevitable impurities. A production method, for a wear resistant sintered alloy, includes preparing a matrix forming powder, the hard phase forming alloy powder, and a graphite powder. The production method further includes mixing 15 to 45% of the hard phase forming alloy powder and 0.5 to 1.5% of the graphite powder with the matrix forming powder into a raw powder. The production method further includes compacting the raw powder into a green compact having a predetermined shape and includes sintering the green compact. A wear resistant sintered alloy exhibits a metallic structure in which 15 to 45% of a hard phase is dispersed in a matrix. The hard phase consists of, by mass %, 15 to 35% of Mo, 1 to 10% of Si, 10 to 40% of Cr, and the balance of Co and inevitable impurities. | 04-18-2013 |
20130084203 | IRON-BASED SINTERED SLIDING MEMBER AND PRODUCTION METHOD THEREFOR - An iron-based sintered sliding member consists of, by mass %, 0.1 to 10% of Cu, 0.2 to 2.0% of C, 0.03 to 0.9% of Mn, 0.52 to 6.54% of S, and the balance of Fe and inevitable impurities. The iron-based sintered sliding member satisfies the following First Formula in which [S %] represents mass % of S and [Mn %] represents mass % of Mn in the overall composition. The iron-based sintered sliding member exhibits a metallic structure in which pores and sulfide particles are dispersed in the matrix that includes a martensite structure at not less than 50% by area ratio in cross section. The sulfide particles are dispersed at 3 to 30 vol. % with respect to the matrix. | 04-04-2013 |
20130058825 | SINTERED ALLOY AND MANUFACTURING METHOD THEREOF - A sintered alloy includes, in percentage by mass, Cr: 11.75 to 39.98, Ni: 5.58 to 24.98, Si: 0.16 to 2.54, P: 0.1 to 1.5, C: 0.58 to 3.62 and the balance of Fe plus unavoidable impurities; a phase A containing precipitated metallic carbides with an average particle diameter of 10 to 50 μm; and a phase B containing precipitated metallic carbides with an average particle diameter of 10 μm or less, wherein the phase A is randomly dispersed in the phase B and the average particle diameter DA of the precipitated metallic carbides in the phase A is larger than the average particle diameter DB of the precipitated metallic carbides of the phase B. | 03-07-2013 |
20130015939 | POWDER MAGNETIC CORE AND METHOD FOR PRODUCING THE SAMEAANM Inagaki; TakashiAACI Matsudo-shiAACO JPAAGP Inagaki; Takashi Matsudo-shi JPAANM Ishihara; ChioAACI Katsushika-kuAACO JPAAGP Ishihara; Chio Katsushika-ku JP - The present invention provides a powder magnetic core which has a low iron loss and an excellent constancy of magnetic permeability and is suitably used as a core for a reactor mounted on a vehicle. The powder magnetic core is a compact of a mixed powder containing an iron-based soft magnetic powder having an electrical insulating coating formed on its surface and a powder of a low magnetic permeability material having a heat-resistant temperature of 700° C. or higher than 700° C. and a relative magnetic permeability of not more than 1.0000004. The density of the compact is 6.7 Mg/m | 01-17-2013 |
20120160293 | THERMOELECTRIC CONVERSION MODULE AND PRODUCTION METHOD THEREFOR - A thermoelectric conversion module has a thermoelectric conversion element and an electrode, which are metallurgically bonded together via a porous metal layer. The porous metal layer is made of nickel or silver and has a density ratio of 50 to 90%. | 06-28-2012 |
20120119134 | SOFT MAGNETIC POWDERED CORE AND METHOD FOR PRODUCING SAME - A powder mixture, which contains a soft magnetic powder and an insulating powder lubricant in an amount of 0.1% by mass or more relative to the soft magnetic powder, is formed by compacting at a compacting pressure of 800 MPa or less, thereby obtaining a powder compact that has a space factor of the soft magnetic powder of 93% or more. The powder compact can be used as a soft magnetic powdered core. The soft magnetic powdered core has a specific resistance or 10,000 μΩcm or more. A powder of a metal soap such as barium stearate or lithium stearate is used as the insulating powder lubricant. | 05-17-2012 |
20120107445 | FORMING DIE ASSEMBLY FOR MICROCOMPONENTS - A forming die assembly for microcomponents includes a forming die, a plunger, and a punch. The forming die is formed with a cavity, a storage portion for storing a raw material with a metal powder and a binder having plasticity, and a punch hole that connects the cavity and the storage portion so as to form a gate therebetween. The plunger is formed so as to be slidably inserted into the storage portion and to fill the raw material stored in the storage portion into the cavity through the punch hole. The punch is slidably inserted into the plunger in the sliding direction of the plunger and opens and closes the gate by reciprocatory sliding. The punch closes the gate and compresses the raw material in the cavity into a green compact by sliding in the direction of the cavity. | 05-03-2012 |
20120107444 | FORMING DIE ASSEMBLY FOR MICROCOMPONENTS - A forming die assembly for microcomponents includes a forming die, a plunger, and a punch. The forming die is formed with an outer die, an inner die, a storage portion formed at the inner die, and a punch hole formed at the inner die. The inner die slidably inserted into the outer die forms a part of a cavity between the inner die and the outer die. The storage portion stores a raw material with a metal powder and a binder having plasticity. The punch hole connects the cavity and the storage portion and forms a gate therebetween. The plunger slidably inserted into the storage portion fills the raw material stored in the storage portion into the cavity through the punch hole. The punch is slidably inserted into the plunger, and it closes the gate and compresses the raw material in the cavity. | 05-03-2012 |
20120107434 | FORMING DIE ASSEMBLY FOR MICROCOMPONENTS - A forming die assembly for microcomponents includes a forming die and a punch. The forming die is formed with a cavity, a punch hole connected to the cavity, and a supply path for supplying a raw material with a metal powder and a binder having plasticity. The supply path is connected to the cavity so as to have a gate therebetween and is used for supplying the raw material into the cavity. The punch is slidably inserted into the punch hole, and it opens and closes the gate by reciprocatory sliding. The punch closes the gate and compresses the raw material in the cavity into a green compact by sliding in the direction of the cavity. | 05-03-2012 |
20120082585 | SINTERED MATERIAL FOR VALVE GUIDES AND PRODUCTION METHOD THEREFOR - A sintered material for valve guides consists of, by mass %, 1.3 to 3% of C, 1 to 4% of Cu, 0.01 to 0.08% of P, 0.05 to 0.5% of Sn, and the balance of Fe and inevitable impurities. The sintered material exhibits a metallic structure made of pores and a matrix. The matrix is a mixed structure of a pearlite phase, a ferrite phase, an iron-phosphorus-carbon compound phase, and at least one of a copper-tin alloy phase and a combination of a copper phase and a copper-tin alloy phase. A part of the pores includes graphite that is dispersed therein. The iron-phosphorus-carbon compound phase is dispersed at 3 to 25% by area ratio, and the copper-tin alloy phase and the combination of the copper phase and the copper-tin alloy phase are dispersed at 0.5 to 3.5% by area ratio, with respect to a cross section of the metallic structure, respectively. | 04-05-2012 |
20120082584 | SINTERED MATERIAL FOR VALVE GUIDES AND PRODUCTION METHOD THEREFOR - A sintered material for valve guides consists of, by mass %, 0.01 to 0.3% of P, 1.3 to 3% of C, 1 to 4% of Cu, and the balance of Fe and inevitable impurities. The sintered material exhibits a metallic structure made of pores and a matrix. The matrix is a mixed structure of a pearlite phase, a ferrite phase, an iron-phosphorus-carbon compound phase, and a copper phase, and a part of the pores including graphite that is dispersed therein. The iron-phosphorus-carbon compound phase is dispersed at 3 to 25% by area ratio, and the copper phase is dispersed at 0.5 to 3.5% by area ratio, with respect to a cross section of the metallic structure, respectively. | 04-05-2012 |
20120082583 | PRODUCTION METHOD FOR SINTERED MEMBER - A production method for a sintered member includes preparing a raw powder, compacting the raw powder into a green compact having pores at the surface thereof, and sintering the green compact into a sintered compact. The production method also includes sealing the pores exposed at the surface of the sintered compact by at least one of plastically deforming and melting the surface of the sintered compact. The production method further includes forging the sintered compact by using a lubricant after the sealing. | 04-05-2012 |
20120067415 | GLASS COMPOSITION, ELECTRICALLY CONDUCTIVE PASTE COMPOSITION COMPRISING SAME, ELECTRODE WIRING MEMBER, AND ELCTRONIC COMPONENT - A glass composition according to the present invention comprises: phosphorus, vanadium and at least one transition metal selected from a group consisting of tungsten, iron, and manganese, the glass composition not containing substances included in the JIG level A and B lists, a softening point of the glass composition being 550° C. or lower. | 03-22-2012 |
20120058340 | SUBSTANTIALLY CYLINDRICAL POWDER COMPACT AND DIE ASSEMBLY FOR COMPACTING POWDER - The cross-sectional shape of a main part except for both end portions is generally divided into a lower arc surface extending along a base circle and an upper arc surface of which a top portion corresponds to the base circle. Side edge portions extending inward from the base circle are formed on both side surfaces of the upper arc surface. Curved edge portions which concavely curves upward from the side edge portions to end surfaces and continues to the end surfaces and chamfer portions extending from the end surfaces to the side surfaces which planes the edges and curves so that width thereof gradually narrows, are formed on both ends in a longitudinal direction. | 03-08-2012 |
20110158842 | PROCESS FOR MANUFACTURING COMPOSITE SINTERED MACHINE COMPONENTS - In a process for manufacturing composite sintered machine components, the composite sintered machine component has an approximately cylindrical inner member and an approximately disk-shaped outer member, the inner member has pillars arranged in a circumferential direction at equal intervals and a center shaft hole surrounded by the pillars, and the outer member has holes corresponding to the pillars of the inner member and a center shaft hole corresponding to the center shaft hole of the inner member and connected to the holes. The process comprises compacting the inner member and the outer member individually using an iron-based alloy powder or an iron-based mixed powder so as to obtain compacts of the inner member and the outer member, tightly fitting the pillars of the inner member into the holes of the outer member, and sintering the inner member and the outer member while maintaining the above condition so as to bond them together. A circumferential side surface facing a circumferential direction of the pillar of the inner member and a circumferential side surface facing a circumferential direction of the hole of the outer member are interference fitted at 0 to 0.03 mm of the interference. A radial side surface facing a radial direction of the pillar of the inner member and a radial side surface facing a radial direction of the hole of the outer member are fitted so as to be one of being interference fitted at not more than 0.01 mm of the interference and being through fitted. | 06-30-2011 |
20110146448 | SINTERED VALVE GUIDE AND PRODUCTION METHOD THEREFOR - A sintered valve guide exhibits a metallic structure having a mixed structure and a hard phase in which hard particles are dispersed in an alloy matrix. The mixed structure consists of pearlite, an Fe—P—C ternary eutectic phase, a ferrite phase, a copper phase, and pores, and the mixed structure consists of, by mass %, 0.075 to 0.525% of P, 3.0 to 10.0% of Cu, 1.0 to 3.0% of C, and the balance of Fe and inevitable impurities. The hard phase is dispersed at 2 to 15 mass % in the mixed structure. | 06-23-2011 |
20100080725 | Production method for sintered valve guide - A production method for a sintered valve guide includes preparing a raw powder which is primarily made of an iron powder and which includes at least a copper alloy powder and a graphite powder. The production method further includes compacting the raw powder into a green compact having an approximately cylindrical shape and sintering the green compact at 950 to 1050° C. The iron powder includes particles, which do not pass through a sieve of 240 mesh, at not less than 40 mass %, and not less than 70 mass % of the powder particles have not more than 0.5 of degree of circularity. | 04-01-2010 |
20100008812 | Hard phase forming alloy powder, wear resistant sintered alloy, and production method for wear resistant sintered alloy - A hard phase forming alloy powder, for forming a hard phase dispersed in a sintered alloy, consists of, by mass %, 15 to 35% of Mo, 1 to 10% of Si, 10 to 40% of Cr, and the balance of Co and inevitable impurities. A production method, for a wear resistant sintered alloy, includes preparing a matrix forming powder, the hard phase forming alloy powder, and a graphite powder. The production method further includes mixing 15 to 45% of the hard phase forming alloy powder and 0.5 to 1.5% of the graphite powder with the matrix forming powder into a raw powder. The production method further includes compacting the raw powder into a green compact having a predetermined shape and includes sintering the green compact. A wear resistant sintered alloy exhibits a metallic structure in which 15 to 45% of a hard phase is dispersed in a matrix. The hard phase consists of, by mass %, 15 to 35% of Mo, 1 to 10% of Si, 10 to 40% of Cr, and the balance of Co and inevitable impurities. | 01-14-2010 |
20090297077 | Fluid dynamic pressure bearing and production method for the same - A fluid dynamic pressure bearing composed of a cylindrical sintered compact includes: a thrust region which is formed on an end surface of the bearing and receives at least a thrust load; a roughed portion having small peaks and valleys formed on the thrust region; and thrust recesses for generating thrust fluid dynamic pressure, which are formed on the thrust region. | 12-03-2009 |
20090291012 | Production method for sintered part - A production method for a sintered part comprises preparing a metal powder and a binder composed of a thermoplastic resin and a wax, mixing the metal powder and 40 to 60 vol. % of the binder with respect to the metal powder into a mixed powder, and heating and kneading the mixed powder into a raw material. This production method further includes supplying a predetermined amount of the raw material in a hole of a die and compacting the raw material into a green compact having a predetermined shape by pressing the raw material by a punch. This production method further includes ejecting the green compact from the hole of the die, removing the binder from the ejected green compact by heating, and sintering the green compact by heating so as to diffusion bond particles of the green compact. The compacting is performed by pressing at a moving rate U of the punch, which is not more than a rate calculated from the following equation (1). In this case, ΔP (Pa) is pressing power of the punch, μ (Pa·s) is viscosity of the raw material, L (m) is a length of the green compact, and De (m) is a corresponding tube diameter. | 11-26-2009 |
20090269235 | Production method for sintered machine components - A production method for sintered machine components, includes preparing an Fe alloy powder A, an Fe alloy powder B, an Fe—P powder, and a graphite powder. The Fe alloy powder A consists of, by mass %, 25 to 45% of Cr, 1.0 to 3.0% of Mo, 1.0 to 3.0% of Si, 0.5 to 1.5% of C, and the balance of Fe and inevitable impurities. The Fe alloy powder B consists of, by mass 15 to 35% of Cr, 15 to 30% of Ni, and the balance of Fe and inevitable impurities, and the Fe—P powder consists of 10 to 30 mass % of P and the balance of Fe and inevitable impurities. The production method further includes mixing 40 to 60 mass % of the Fe alloy powder B, 1.0 to 5.0 mass % of the Fe—P powder, and 0.5 to 3.5 mass % of the graphite powder with the Fe alloy powder A into a mixed powder. The production method further includes compacting the mixed powder into a green compact and sintering the green compact. | 10-29-2009 |
20090092848 | Sintered composite sliding part and production method therefor - A sintered composite sliding part has an outer member made of an Fe-based wear resistant sintered member in which a hard phase is dispersed in a matrix at 15 to 70% by volume and an inner member made of a stainless ingot steel. The matrix is made of an Fe-based alloy including 11 to 35% by mass of Cr, and the hard phase is formed by precipitating and dispersing at least one selected from the group consisting of intermetallic compounds, metallic suicides, metallic carbides, metallic borides, and metallic nitrides in an alloy matrix made of at least one selected from the group consisting of Fe, Ni, Cr, and Co. The outer member is formed with a hole, the inner member is closely fitted into the hole, and the outer member and the inner member are diffusion bonded together. | 04-09-2009 |
20090067766 | Sliding Bearing - A sliding bearing comprises a shaft hole for rotatably supporting a shaft that is inserted thereinto, an inner circumferential surface on which the shaft slides, and plural linearly oblique grooves. The grooves extend in a direction crossing a circumferential direction of the sliding bearing and are formed on the inner circumferential surface at intervals, and the grooves are provided with a lubricant. The oblique grooves have an oblique angle in a range of 10° to 60° with respect to a direction perpendicular to the circumferential direction and have a width B in a range of 0.5 to 5 mm in the circumferential direction. The adjacent grooves have a land with a surface as a sliding surface therebetween, and the sliding surface has a width A in a range of 1 to 7 mm in the circumferential direction. A ratio A/B of the width A of the sliding surface of the land to the width B of the groove is in a range of 0.5 to 5.0. | 03-12-2009 |
20080232995 | Method for producing soft magnetic powdered core - A method for producing a soft magnetic powdered core includes preparing a mixture of a soft magnetic powder and a resin powder, compacting the mixture into a predetermined shape so as to obtain a compact, and heating the compact. The resin powder has a median size of not more than 30 μm, a maximum particle size of not more than 100 μm, and a specific surface area of not less than 1.0 m | 09-25-2008 |