公开(公告)号：US11056258B2

公开(公告)日：2021-07-06

申请号：US15547681

申请日：2016-01-28

Applicant: Panasonic Intellectual Property Management Co., Ltd. ,  THE DOSHISHA

Inventor： Ken Hirota ,  Masaki Kato ,  Junichi Kotani ,  Nobuya Matsutani

IPC: H01F1/34 ,  H01F1/03 ,  C01G49/00 ,  H01F41/02

Abstract: A production method for a magnetic material, which is expressed by a chemical structure formula Fe(Al1-xMnx)2O4, where 0

公开(公告)号：US20170362129A1

公开(公告)日：2017-12-21

申请号：US15390088

申请日：2016-12-23

Applicant: THE DOSHISHA ,  DAIICHI KIGENSO KAGAKU KOGYO CO., LTD.

Inventor： Ken Hirota ,  Xiaoteng Ge ,  Hideo Kimura

IPC: C04B35/488 ,  C04B35/64

CPC classification number: C04B35/4885 ,  C04B35/6262 ,  C04B35/62695 ,  C04B35/63416 ,  C04B35/64 ,  C04B2235/3217 ,  C04B2235/3225 ,  C04B2235/3246 ,  C04B2235/5454 ,  C04B2235/549 ,  C04B2235/604 ,  C04B2235/656 ,  C04B2235/6562 ,  C04B2235/6567 ,  C04B2235/667 ,  C04B2235/765 ,  C04B2235/77 ,  C04B2235/781 ,  C04B2235/785 ,  C04B2235/96

Abstract: A ZrO2—Al2O3-based ceramic sintered compact containing tetragonal ZrO2 particles having a crystallite size of from 5 to 20 nm as a main component and having an α-Al2O3 crystallite size of not greater than 75 nm and a relative density of not less than 99% can be produced by preparing a Y2O3 partially stabilized ZrO2—Al2O3-based powder having a molar ratio (mol %) of zirconia (ZrO2) and yttria (Y2O3) of from 96.5:3.5 to 97.5:2.5 and a mass ratio (mass %) of ZrO2 containing Y2O3 and alumina (Al2O3) of from 85:15 to 75:25, molding this powder by cold isostatic pressing, and then performing sintering to a high density by microwave sintering for 45 to 90 min in an inert gas atmosphere at 1200 to 1400° C. When performing microwave sintering, a heating rate is preferably from 5 to 20° C./min up to 600° C. and from 50 to 150° C./min at 600° C. or higher.

公开(公告)号：US09902654B2

公开(公告)日：2018-02-27

申请号：US15390088

申请日：2016-12-23

Applicant: THE DOSHISHA ,  DAIICHI KIGENSO KAGAKU KOGYO CO., LTD.

Inventor： Ken Hirota ,  Xiaoteng Ge ,  Hideo Kimura

IPC: C04B35/119 ,  C04B35/488 ,  C04B35/64

CPC classification number: C04B35/4885 ,  C04B35/6262 ,  C04B35/62695 ,  C04B35/63416 ,  C04B35/64 ,  C04B2235/3217 ,  C04B2235/3225 ,  C04B2235/3246 ,  C04B2235/5454 ,  C04B2235/549 ,  C04B2235/604 ,  C04B2235/656 ,  C04B2235/6562 ,  C04B2235/6567 ,  C04B2235/667 ,  C04B2235/765 ,  C04B2235/77 ,  C04B2235/781 ,  C04B2235/785 ,  C04B2235/96

Abstract: A ZrO2—Al2O3-based ceramic sintered compact containing tetragonal ZrO2 particles having a crystallite size of from 5 to 20 nm as a main component and having an α-Al2O3 crystallite size of not greater than 75 nm and a relative density of not less than 99% can be produced by preparing a Y2O3 partially stabilized ZrO2—Al2O3-based powder having a molar ratio (mol %) of zirconia (ZrO2) and yttria (Y2O3) of from 96.5:3.5 to 97.5:2.5 and a mass ratio (mass %) of ZrO2 containing Y2O3 and alumina (Al2O3) of from 85:15 to 75:25, molding this powder by cold isostatic pressing, and then performing sintering to a high density by microwave sintering for 45 to 90 min in an inert gas atmosphere at 1200 to 1400° C. When performing microwave sintering, a heating rate is preferably from 5 to 20° C./min up to 600° C. and from 50 to 150° C./min at 600° C. or higher.