Patents Assigned to Hitachi Powdered Metals, Co., Ltd.
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Patent number: 8470723Abstract: A low softening point glass composition, which is substantially free from lead, bismuth and antimony and comprises oxides of vanadium, phosphorous, tellurium and iron, a softening point of the composition being 380° C. or lower.Type: GrantFiled: January 14, 2010Date of Patent: June 25, 2013Assignee: Hitachi Powdered Metals Co., Ltd.Inventors: Takashi Naito, Shinichi Tachizono, Kei Yoshimura, Yuji Hashiba, Keiichi Kanazawa, Shinji Yamada, Satoru Amou, Hiroki Yamamoto, Takuya Aoyagi
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Publication number: 20130101244Abstract: 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 ?m at 0.9 to 2.5%, interparticle pores with circle-equivalent diameters of 63 to 75 ?m at 0.1 to 1.2%, and large interparticle pores with circle-equivalent diameters of larger than 75 ?m at not more than 3%, with respect to the total number of the pores.Type: ApplicationFiled: October 19, 2012Publication date: April 25, 2013Applicant: HITACHI POWDERED METALS CO., LTD.Inventor: Hitachi Powdered Metals Co., Ltd.
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Publication number: 20130091986Abstract: 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.Type: ApplicationFiled: December 6, 2012Publication date: April 18, 2013Applicant: HITACHI POWDERED METALS CO., LTD.Inventor: HITACHI POWDERED METALS CO., LTD.
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Publication number: 20130093131Abstract: 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.Type: ApplicationFiled: December 6, 2012Publication date: April 18, 2013Applicant: HITACHI POWDERED METALS CO., LTD.Inventor: Hitachi Powdered Metals Co., Ltd.
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Publication number: 20130084203Abstract: 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. [S %]=0.6×[Mn %]+0.5 to 6.Type: ApplicationFiled: October 1, 2012Publication date: April 4, 2013Applicant: HITACHI POWDERED METALS CO., LTD.Inventor: HITACHI POWDERED METALS CO., LTD.
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Patent number: 8398879Abstract: 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 ??cm or more. A powder of a metal soap such as barium stearate or lithium stearate is used as the insulating powder lubricant.Type: GrantFiled: July 8, 2010Date of Patent: March 19, 2013Assignee: Hitachi Powdered Metals Co., Ltd.Inventors: Kohei Muramatsu, Chio Ishihara, Masaki Yanaka
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Publication number: 20130058825Abstract: 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 ?m; and a phase B containing precipitated metallic carbides with an average particle diameter of 10 ?m 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.Type: ApplicationFiled: August 13, 2012Publication date: March 7, 2013Applicant: HITACHI POWDERED METALS CO., LTD.Inventors: Daisuke FUKAE, Hideaki KAWATA
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Patent number: 8367573Abstract: A glass composition substantially free from lead and bismuth and containing vanadium oxide and phosphor oxide as main ingredients, wherein the sintered glass of the glass composition exhibits 109 ?cm or more at 25° C.Type: GrantFiled: February 6, 2009Date of Patent: February 5, 2013Assignee: Hitachi Powdered Metals Co., Ltd.Inventors: Takashi Naito, Shinichi Tachizono, Kei Yoshimura, Hiroki Yamamoto, Hiroshi Yoshida, Shinji Yamada, Katsumi Mabuchi
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Publication number: 20130015939Abstract: 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/m3 or more, and the low magnetic permeability material exists in the gap among the soft magnetic powder particles in the green compact.Type: ApplicationFiled: March 25, 2011Publication date: January 17, 2013Applicant: HITACHI POWDERED METALS CO. LTD.Inventors: Takashi Inagaki, Chio Ishihara
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Patent number: 8337747Abstract: 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. 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.Type: GrantFiled: March 11, 2011Date of Patent: December 25, 2012Assignee: Hitachi Powdered Metals Co., Ltd.Inventors: Hiromasa Imazato, Koichiro Yokoyama
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Patent number: 8337723Abstract: Disclosed is an electroconductive material which contains at least a vanadium oxide and a phosphorus oxide, and has a crystalline structure composed of a crystalline phase and an amorphous phase, in which the crystalline phase contains a monoclinic vanadium-containing oxide, and a volume of the crystalline phase is larger than that of the amorphous phase. The electroconductive material has a reduced specific resistance and has improved functions as an electrode material, a solid-state electrolyte, or a sensor such as a thermistor.Type: GrantFiled: July 1, 2010Date of Patent: December 25, 2012Assignees: Hitachi Powdered Metals Co., Ltd., Hitachi, Ltd.Inventors: Yuji Hashiba, Shinichi Tachizono, Kei Yoshimura, Takashi Naito, Takuya Aoyagi
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Patent number: 8236087Abstract: The present invention relates to an iron-base powder for a powder core, wherein when cross-sections of at least 50 iron-base powders are observed and a crystal grain size distribution containing at least a maximum crystal grain size is determined by measuring a crystal grain size of each iron-base powder, 70% or more of the measured crystal grains are a crystal grain having a crystal grain size of 50 ?m or more. According to the iron-base powder of the invention, a coercivity of the powder core can be made small and a hysteresis loss can be reduced.Type: GrantFiled: September 11, 2007Date of Patent: August 7, 2012Assignees: Kobe Steel, Ltd., Hitachi Powdered Metals Co., Ltd.Inventors: Hiroyuki Mitani, Nobuaki Akagi, Hirofumi Houjou, Chio Ishihara, Makoto Iwakiri, Sohei Yamada, Yasukuni Mochimizo
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Patent number: 8220153Abstract: A production method for complex bearings includes: preparing an outer member and a cylindrical sintered bearing member. The outer member includes a fitting hole having: an almost circular cross section; an inner peripheral surface; and a surface roughness of the inner peripheral surface which is 3.2 to 100 ?m at a maximal height. The sintered bearing member includes: an outer diameter allowing clearance fit of the sintered bearing member into the fitting hole of the outer member. The production method further includes: inserting the sintered bearing member into the fitting hole of the outer member and inserting a columnar core rod into an inner peripheral surface of the sintered bearing member; and compressing the sintered bearing member in an axial direction.Type: GrantFiled: May 22, 2007Date of Patent: July 17, 2012Assignee: Hitachi Powdered Metals Co., Ltd.Inventor: Makoto Kondo
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Publication number: 20120160293Abstract: 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%.Type: ApplicationFiled: December 16, 2011Publication date: June 28, 2012Applicant: HITACHI POWDERED METALS CO., LTD.Inventors: Takahiro JINUSHI, Zenzo ISHIJIMA
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Publication number: 20120119134Abstract: 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 ??cm or more. A powder of a metal soap such as barium stearate or lithium stearate is used as the insulating powder lubricant.Type: ApplicationFiled: July 8, 2010Publication date: May 17, 2012Applicant: HITACHI POWDERED METALS CO., LTDInventors: Kohei Muramatsu, Chio Ishihara, Masaki Yanaka
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Publication number: 20120107444Abstract: 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.Type: ApplicationFiled: October 24, 2011Publication date: May 3, 2012Applicant: HITACHI POWDERED METALS CO., LTD.Inventors: Narutoshi MURASUGI, Kazunori MAEKAWA, Zenzo ISHIJIMA
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Publication number: 20120107434Abstract: 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.Type: ApplicationFiled: October 24, 2011Publication date: May 3, 2012Applicant: HITACHI POWDERED METALS CO., LTD.Inventors: Narutoshi MURASUGI, Kazunori MAEKAWA, Zenzo ISHIJIMA
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Publication number: 20120107445Abstract: 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.Type: ApplicationFiled: October 24, 2011Publication date: May 3, 2012Applicant: HITACHI POWDERED METALS CO., LTD.Inventors: Narutoshi MURASUGI, Kazunori MAEKAWA, Zenzo ISHIJIMA
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Publication number: 20120082583Abstract: 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.Type: ApplicationFiled: September 23, 2011Publication date: April 5, 2012Applicant: HITACHI POWDERED METALS CO., LTD.Inventors: Tomoyuki KOHIDA, Katsuhiko UEDA, Kenzou MORITA
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Publication number: 20120082584Abstract: 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.Type: ApplicationFiled: September 23, 2011Publication date: April 5, 2012Applicant: HITACHI POWDERED METALS CO., LTD.Inventors: Hiroki FUJITSUKA, Hideaki KAWATA