Patents by Inventor Yukihiko Yamauchi
Yukihiko Yamauchi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 7442661Abstract: A boron carbide based sintered body having a four-point flexural strength of at least 400 MPa and a fracture toughness of at least 2.8 MPa·m1/2, which has the following two preferred embodiments. (1) A boron carbide-titanium diboride sintered body obtained by sintering a mixed powder of a B4C powder, a TiO2 powder and a C powder while reacting them under a pressurized condition and comprising from 95 to 70 mol % of boron carbide and from 5 to 30 mol % of titanium diboride, wherein the boron carbide has a maximum particle diameter of at most 5 ?m. (2) A boron carbide-chromium diboride sintered body containing from 10 to 25 mol % of CrB2 in B4C, wherein the sintered body has a relative density of at least 90%, boron carbide particles in the sintered body have a maximum particle diameter of at most 100 ?m, and the abundance ratio (area ratio) of boron carbide particles of from 10 to 100 ?m to boron carbide particles having a particle diameter of at most 5 ?m, is from 0.02 to 0.6.Type: GrantFiled: December 29, 2006Date of Patent: October 28, 2008Assignees: National Institute of Advanced Industrial Science and Technology, Denki Kagku Kogyo Kabushiki KaishaInventors: Kiyoshi Hirao, Shuji Sakaguchi, Yukihiko Yamauchi, Shuzo Kanzaki, Suzuya Yamada
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Patent number: 7417002Abstract: A boron carbide based sintered body having a four-point flexural strength of at least 400 MPa and a fracture toughness of at least 2.8 MPa·m1/2, which has the following two preferred embodiments. (1) A boron carbide-titanium diboride sintered body obtained by sintering a mixed powder of a B4C powder, a TiO2 powder and a C powder while reacting them under a pressurized condition and comprising from 95 to 70 mol % of boron carbide and from 5 to 30 mol % of titanium diboride, wherein the boron carbide has a maximum particle diameter of at most 5 ?m. (2) A boron carbide-chromium diboride sintered body containing from 10 to 25 mol % of CrB2 in B4C, wherein the sintered body has a relative density of at least 90%, boron carbide particles in the sintered body have a maximum particle diameter of at most 100 ?m, and the abundance ratio (area ratio) of boron carbide particles of from 10 to 100 ?m to boron carbide particles having a particle diameter of at most 5 ?m, is from 0.02 to 0.6.Type: GrantFiled: October 29, 2007Date of Patent: August 26, 2008Assignees: National Institute of Advanced Industrial Science and Technology, Denki Kagaku Kogyo Kabushiki KaishaInventors: Kiyoshi Hirao, Shuji Sakaguchi, Yukihiko Yamauchi, Shuzo Kanzaki, Suzuya Yamada
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Publication number: 20080063583Abstract: A boron carbide based sintered body having a four-point flexural strength of at least 400 MPa and a fracture toughness of at least 2.8 MPa·m1/2, which has the following two preferred embodiments. (1) A boron carbide-titanium diboride sintered body obtained by sintering a mixed powder of a B4C powder, a TiO2 powder and a C powder while reacting them under a pressurized condition and comprising from 95 to 70 mol % of boron carbide and from 5 to 30 mol % of titanium diboride, wherein the boron carbide has a maximum particle diameter of at most 5 ?m. (2) A boron carbide-chromium diboride sintered body containing from 10 to 25 mol % of CrB2 in B4C, wherein the sintered body has a relative density of at least 90%, boron carbide particles in the sintered body have a maximum particle diameter of at most 100 ?m, and the abundance ratio (area ratio) of boron carbide particles of from 10 to 100 ?m to boron carbide particles having a particle diameter of at most 5 ?m, is from 0.02 to 0.6.Type: ApplicationFiled: October 29, 2007Publication date: March 13, 2008Applicants: Nat'l Inst. of Advanced Ind. Science and Tech., Denki Kagaku Kogyo Kabushiki KaishaInventors: Kiyoshi Hirao, Shuji Sakaguchi, Yukihiko Yamauchi, Shuzo Kanzaki, Suzuya Yamada
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Publication number: 20070135292Abstract: A boron carbide based sintered body having a four-point flexural strength of at least 400 MPa and a fracture toughness of at least 2.8 MPa·m1/2, which has the following two preferred embodiments. (1) A boron carbide-titanium diboride sintered body obtained by sintering a mixed powder of a B4C powder, a TiO2 powder and a C powder while reacting them under a pressurized condition and comprising from 95 to 70 mol % of boron carbide and from 5 to 30 mol % of titanium diboride, wherein the boron carbide has a maximum particle diameter of at most 5 ?m. (2) A boron carbide-chromium diboride sintered body containing from 10 to 25 mol % of CrB2 in B4C, wherein the sintered body has a relative density of at least 90%, boron carbide particles in the sintered body have a maximum particle diameter of at most 100 ?m, and the abundance ratio (area ratio) of boron carbide particles of from 10 to 100 ?m to boron carbide particles having a particle diameter of at most 5 ?m, is from 0.02 to 0.6.Type: ApplicationFiled: December 29, 2006Publication date: June 14, 2007Applicants: Nat'l Inst. of Advanced Ind. Science and Tech., Denki Kagaku Kogyo Kabushiki KaishaInventors: Kiyoshi HIRAO, Shuji Sakaguchi, Yukihiko Yamauchi, Shuzo Kanzaki, Suzuya Yamada
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Publication number: 20060247120Abstract: A boron carbide based sintered body having a four-point flexural strength of at least 400 MPa and a fracture toughness of at least 2.8 MPa·m1/2, which has the following two preferred embodiments. (1) A boron carbide-titanium diboride sintered body obtained by sintering a mixed powder of a B4C powder, a TiO2 powder and a C powder while reacting them under a pressurized condition and comprising from 95 to 70 mol % of boron carbide and from 5 to 30 mol % of titanium diboride, wherein the boron carbide has a maximum particle diameter of at most 5 ?m. (2) A boron carbide-chromium diboride sintered body containing from 10 to 25 mol % of CrB2 in B4C, wherein the sintered body has a relative density of at least 90%, boron carbide particles in the sintered body have a maximum particle diameter of at most 100 ?m, and the abundance ratio (area ratio) of boron carbide particles of from 10 to 100 ?m to boron carbide particles having a particle diameter of at most 5 ?m, is from 0.02 to 0.6.Type: ApplicationFiled: June 30, 2006Publication date: November 2, 2006Applicants: Nat'l Inst. of Advanced Ind. Science and Tech., Denki Kagaku Kogyo Kabushiki KaishaInventors: Kiyoshi Hirao, Shuji Sakaguchi, Yukihiko Yamauchi, Shuzo Kanzaki, Suzuya Yamada
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Publication number: 20060057292Abstract: The present invention provides a method of manufacturing a porous thick film of an oxide that has extremely few cracks and can be satisfactorily used as an oxygen partial pressure detecting part of an oxygen sensor.Type: ApplicationFiled: December 22, 2003Publication date: March 16, 2006Applicant: National Institute of Adv. Industrial Sci. & TechInventors: Noriya Izu, Woosuck Shin, Ichiro Matsubara, Norimitsu Murayama, Yukihiko Yamauchi, Shuzo Kanzaki
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Publication number: 20050059541Abstract: A boron carbide based sintered body having a four-point flexural strength of at least 400 MPa and a fracture toughness of at least 2.8 MPa·m1/2, which has the following two preferred embodiments. (1) A boron carbide-titanium diboride sintered body obtained by sintering a mixed powder of a B4C powder, a TiO2 powder and a C powder while reacting them under a pressurized condition and comprising from 95 to 70 mol % of boron carbide and from 5 to 30 mol % of titanium diboride, wherein the boron carbide has a maximum particle diameter of at most 5 ?m. (2) A boron carbide-chromium diboride sintered body containing from 10 to 25 mol % of CrB2 in B4C, wherein the sintered body has a relative density of at least 90%, boron carbide particles in the sintered body have a maximum particle diameter of at most 100 ?m, and the abundance ratio (area ratio) of boron carbide particles of from 10 to 100 ?m to boron carbide particles having a particle diameter of at most 5 ?m, is from 0.02 to 0.6.Type: ApplicationFiled: November 6, 2002Publication date: March 17, 2005Inventors: Kiyoshi Hirao, Shuji Sakaguchi, Yukihiko Yamauchi, Shuzo Kanzaki, Suzuya Yamada
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Publication number: 20040033394Abstract: It is an object to provide an aluminum oxide-based sintered body and a manufacturing method thereof, according to which all of wear resistance, strength and fracture toughness can be exhibited to a high degree in a single sintered body, and there is provided a method of manufacturing a multi-layer aluminum oxide sintered body having high strength and wear resistance as well as high fracture toughness, that has a structure of at least two layers in which a surface layer is a high-strength wear-resistant layer comprising isometric crystals having a small grain size, and an inner part is a high-fracture-toughness layer constituted from anisotropic crystals, the method comprising the steps of (1) preparing a layered body by forming a layer of an aluminum oxide material that has a purity of at least 90% and contains a grain growth inhibiting agent and a layer of an aluminum oxide material that has a purity of at least 90% and contains a grain growth promoting agent, (2) carrying out setting such that the sinteringType: ApplicationFiled: June 11, 2003Publication date: February 19, 2004Applicant: National Inst. of Advanced Ind. Science and Tech.Inventors: Yu-ichi Yoshizawa, Kiyoshi Hirao, Yukihiko Yamauchi, Shuzo Kanzaki
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Publication number: 20030136057Abstract: The present invention provides a novel polishing material with which silicon nitride ceramic and sialon ceramic can be polished at high efficiency through a tribochemical reaction, and a method for manufacturing thereof, said material is used for polishing a silicon nitride ceramic or sialon ceramic as a material being polished, through a tribochemical reaction, and consists of a ceramic sinter containing an element that causes the ceramic being polished to undergo a dissolution reaction at the grain boundary of the sinter, within the particles thereof, and/or in pores thereof.Type: ApplicationFiled: November 13, 2002Publication date: July 24, 2003Applicant: National Inst. of Advanced Ind. Science and Tech.Inventors: Kiyoshi Hirao, Shuji Sakaguchi, Yukihiko Yamauchi, Shuzo Kanzaki, Takeshi Sato