Patents by Inventor Haruna Nakajima
Haruna Nakajima 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: 10410777Abstract: An R-T-B based sintered magnet has excellent corrosion resistance together with good magnetic properties. The R-T-B based sintered magnet contains R2T14B grains, wherein, an R—Cu-M-C concentrated part is existed in a grain boundary formed between or among two or more adjacent R2T14B grains, and the concentrations of R (R is at least one from Sc, Y and the lanthanoide element), Cu, M (M is at least one from Ga, Si, Sn, Ge and Bi) and C in the R—Cu-M-C concentrated part are higher than those in the R2T14B grains respectively.Type: GrantFiled: August 8, 2014Date of Patent: September 10, 2019Assignee: TDK CORPORATIONInventors: Isao Kanada, Masashi Miwa, Haruna Nakajima, Eiji Kato
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Patent number: 10388443Abstract: The present invention provides an R-T-B based sintered magnet having an R-T-B based compound as main phase grains, wherein, the content of Zr contained in the R-T-B based sintered magnet is 0.3 mass % to 2.0 mass %, the main phase grains have Zr, and the R-T-B based sintered magnet have main phase grains with the mass concentration of Zr at the edge portion of the main phase grain being 70% or less of that at the central portion of the main phase grain at the cross-section of the main phase grain.Type: GrantFiled: February 4, 2016Date of Patent: August 20, 2019Assignee: TDK CORPORATIONInventors: Masashi Miwa, Takurou Iwasa, Haruna Nakajima
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Patent number: 10256015Abstract: The present invention provides an R-T-B based sintered magnet having excellent corrosion resistance together with good magnetic properties. The R-T-B based sintered magnet contains R2T14B crystal grains, wherein, an R—Ga—Co—Cu—N concentrated part exists in a grain boundary formed between or among two or more adjacent R2T14B crystal grains, and the concentrations of R, Ga, Co, Cu and N in the R—Ga—Co—Cu—N concentrated part are higher than those in the R2T14B crystal grains respectively.Type: GrantFiled: August 8, 2014Date of Patent: April 9, 2019Assignee: TDK CORPORATIONInventors: Masashi Miwa, Haruna Nakajima, Isao Kanada
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Patent number: 10242777Abstract: Provided is a sintered magnet that is an R-T-B based sintered magnet having a region having a concentration of at least one heavy rare earth element decreasing from the surface toward the inside, in which the at least one heavy rare earth element includes at least either of Tb or Dy, R includes Nd, T includes Fe, Co, and Cu, there is a grain boundary phase containing at least either of Tb or Dy and Nd between two main phase particles, and a value obtained by subtracting a half value width of a concentration distribution curve of Cu from a half value width of a concentration distribution curve of Tb or Dy in a part including the grain boundary phase is from 10 to 20 nm.Type: GrantFiled: January 31, 2017Date of Patent: March 26, 2019Assignee: TDK CorporationInventors: Makoto Iwasaki, Tetsuya Hidaka, Takuma Hayakawa, Ayato Kakoki, Yoshinori Fujikawa, Syota Goto, Haruna Nakajima, Takeshi Masuda, Chikara Ishizaka
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Publication number: 20190074114Abstract: Provided is a sintered magnet that is an R-T-B based sintered magnet having a region having a concentration of at least one heavy rare earth element decreasing from the surface toward the inside, in which the at least one heavy rare earth element includes at least either of Tb or Dy, R includes Nd, T includes Fe, Co, and Cu, there is a grain boundary phase containing at least either of Tb or Dy and Nd between two main phase particles, and a value obtained by subtracting a half value width of a concentration distribution curve of Cu from a half value width of a concentration distribution curve of Tb or Dy in a part including the grain boundary phase is from 10 to 20 nm.Type: ApplicationFiled: November 6, 2018Publication date: March 7, 2019Applicant: TDK CorporationInventors: Makoto IWASAKI, Tetsuya HIDAKA, Takuma HAYAKAWA, Ayato KAKOKI, Yoshinori FUJIKAWA, Syota GOTO, Haruna NAKAJIMA, Takeshi MASUDA, Chikara ISHIZAKA
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Patent number: 10096410Abstract: An R-T-B based sintered magnet having R2T14B crystal grains and a grain boundary formed by two or more adjacent R2T14B crystal grains. An R—Co—Cu—N concentrated part whose concentrations of R, Co, Cu and N are respectively higher than those in the R2T14B crystal grains may be in the grain boundary. An R—O—C concentrated part or an R—O—C—N concentrated part may be further provided in the grain boundary.Type: GrantFiled: July 3, 2014Date of Patent: October 9, 2018Assignee: TDK CORPORATIONInventors: Masashi Miwa, Haruna Nakajima, Koji Mitake, Chikara Ishizaka
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Patent number: 9773599Abstract: The present invention provides an R-T-B based sintered magnet including R2T14B crystal grains wherein; a grain boundary is formed by two or more adjacent R2T14B crystal grains, an R—O—C concentrated part, in which concentrations of R, O and C are higher than those in the R2T14B crystal grains respectively, is in the grain boundary, and a ratio (O/R) of O atom to R atom in the R—O—C concentrated part satisfies the following formula (1): 0.4<(O/R)<0.7.Type: GrantFiled: February 13, 2013Date of Patent: September 26, 2017Assignee: TDK CORPORATIONInventors: Masashi Miwa, Haruna Nakajima, Ken-ichi Nishikawa, Tetsuya Hidaka, Jun Hagiwara, Chikara Ishizaka
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Publication number: 20170221616Abstract: Provided is a sintered magnet that is an R-T-B based sintered magnet having a region having a concentration of at least one heavy rare earth element decreasing from the surface toward the inside, in which the at least one heavy rare earth element includes at least either of Tb or Dy, R includes Nd, T includes Fe, Co, and Cu, there is a grain boundary phase containing at least either of Tb or Dy and Nd between two main phase particles, and a value obtained by subtracting a half value width of a concentration distribution curve of Cu from a half value width of a concentration distribution curve of Tb or Dy in a part including the grain boundary phase is from 10 to 20 nm.Type: ApplicationFiled: January 31, 2017Publication date: August 3, 2017Applicant: TDK CorporationInventors: Makoto IWASAKI, Tetsuya HIDAKA, Takuma HAYAKAWA, Ayato KAKOKI, Yoshinori FUJIKAWA, Syota GOTO, Haruna NAKAJIMA, Takeshi MASUDA, Chikara ISHIZAKA
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Patent number: 9514869Abstract: The present invention provides an R-T-B based sintered magnet including R2T14B crystal grains wherein; a grain boundary is formed by two or more adjacent R2T14B crystal grains, an R—O—C concentrated part, in which concentrations of R, O and C are higher than those in the R2T14B crystal grains respectively, is in the grain boundary, and an area of the R—O—C concentrated part occupying in that of the grain boundary on a cut surface of the R-T-B based sintered magnet is within a range of 10% or more to 75% or less.Type: GrantFiled: February 13, 2013Date of Patent: December 6, 2016Assignee: TDK CORPORATIONInventors: Masashi Miwa, Haruna Nakajima, Ken-ichi Nishikawa, Tetsuya Hidaka, Jun Hagiwara, Chikara Ishizaka
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Publication number: 20160225501Abstract: The present invention provides an R-T-B based sintered magnet having an R-T-B based compound as main phase grains, wherein, the content of Zr contained in the R-T-B based sintered magnet is 0.3 mass % to 2.0 mass %, the main phase grains have Zr, and the R-T-B based sintered magnet have main phase grains with the mass concentration of Zr at the edge portion of the main phase grain being 70% or less of that at the central portion of the main phase grain at the cross-section of the main phase grain.Type: ApplicationFiled: February 4, 2016Publication date: August 4, 2016Applicant: TDK CORPORATIONInventors: Masashi MIWA, Takurou IWASA, Haruna NAKAJIMA
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Publication number: 20160163434Abstract: The present invention provides an R-T-B based sintered magnet having excellent corrosion resistance together with good magnetic properties. The R-T-B based sintered magnet contains R2T14B grains, wherein, an R—Cu-M-C concentrated part is existed in a grain boundary formed between or among two or more adjacent R2T14B grains, and the concentrations of R (R is at least one from Sc, Y and the lanthanoide element), Cu, M (M is at least one from Ga, Si, Sn, Ge and Bi) and C in the R—Cu-M-C concentrated part are higher than those in the R2T14B grains respectively.Type: ApplicationFiled: August 8, 2014Publication date: June 9, 2016Applicant: TDK CorporationInventors: Isao KANADA, Masashi MIWA, Haruna NAKAJIMA, Eiji KATO
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Publication number: 20160163435Abstract: The present invention provides an R-T-B based sintered magnet having excellent corrosion resistance together with good magnetic properties. The R-T-B based sintered magnet contains R2T14B crystal grains, wherein, an R—Ga—Co—Cu—N concentrated part exists in a grain boundary formed between or among two or more adjacent R2T14B crystal grains, and the concentrations of R, Ga, Co, Cu and N in the R—Ga—Co—Cu—N concentrated part are higher than those in the R2T14B crystal grains respectively.Type: ApplicationFiled: August 8, 2014Publication date: June 9, 2016Applicant: TDK CorporationInventors: Masashi MIWA, Haruna NAKAJIMA, Isao KANADA
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Publication number: 20160086701Abstract: An R-T-B based sintered magnet having R2T14B crystal grains and a grain boundary formed by two or more adjacent R2T14B crystal grains. An R—Co—Cu—N concentrated part whose concentrations of R, Co, Cu and N are respectively higher than those in the R2T14B crystal grains may be in the grain boundary. An R—O—C concentrated part or an R—O—C—N concentrated part may be further provided in the grain boundary.Type: ApplicationFiled: July 3, 2014Publication date: March 24, 2016Applicant: TDK CORPORATIONInventors: Masashi MIWA, Haruna NAKAJIMA, Koji MITAKE, Chikara ISHIZAKA
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Publication number: 20150235750Abstract: The present invention provides an R-T-B based sintered magnet including R2T14B crystal grains wherein; a grain boundary is formed by two or more adjacent R2T14B crystal grains, an R—O—C concentrated part, in which concentrations of R, O and C are higher than those in the R2T14B crystal grains respectively, is in the grain boundary, and a ratio (O/R) of O atom to R atom in the R—O—C concentrated part satisfies the following formula (1): 0.4<(O/R)<0.7.Type: ApplicationFiled: February 13, 2013Publication date: August 20, 2015Applicant: TDK CorporationInventors: Masashi Miwa, Haruna Nakajima, Ken-ichi Nishikawa, Tetsuya Hidaka, Jun Hagiwara, Chikara Ishizaka
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Publication number: 20150155083Abstract: The present invention provides an R-T-B based sintered magnet including R2T14B crystal grains wherein; a grain boundary is formed by two or more adjacent R2T14B crystal grains, an R—O—C concentrated part, in which concentrations of R, O and C are higher than those in the R2T14B crystal grains respectively, is in the grain boundary, and an area of the R—O—C concentrated part occupying in that of the grain boundary on a cut surface of the R-T-B based sintered magnet is within a range of 10% or more to 75% or less.Type: ApplicationFiled: February 13, 2013Publication date: June 4, 2015Applicant: TDK CORPORATIONInventors: Masashi Miwa, Haruna Nakajima, Ken-ichi Nishikawa, Tetsuya Hidaka, Jun Hagiwara, Chikara Ishizaka