公开(公告)号：JPH09202661A

公开(公告)日：1997-08-05

申请号：JP1189096

申请日：1996-01-26

Applicant: TOYOTA MOTOR CORP

Inventor： OKAZAKI TOSHIHIRO ,  SAKAI TAKENOBU

IPC: C04B35/49 ,  H01L41/187

Abstract: PROBLEM TO BE SOLVED: To improve mechanical and electrical strengths by replacing a part of Ti with at least one of In, Ga and Co and at least one of Mn, Fe and Cr and properly balancing the amounts of the replaced elements. SOLUTION: This piezoelectric porcelain composition of the formula Pb(Zr1-x Tix-y-j Lz Nj )O3 [L is at least one of In, Ga and Co; N is at least one of Mn, Fe and Cr; (x) is 0.40

公开(公告)号：JPH0769724A

公开(公告)日：1995-03-14

申请号：JP21757793

申请日：1993-09-01

Applicant: TOYOTA MOTOR CORP

Inventor： SAKAI TAKENOBU

IPC: C04B35/49 ,  H01L41/187

Abstract: PURPOSE:To obtain a piezoelectric porcelain composition capable of producing a piezoelectric body having excellent heat resistance and piezoelectric properties. CONSTITUTION:This piezoelectric porcelain has the composition expressed by the following formula: Pb1-x-y-zLaxMy(ZraTi1-a-bNbb)O3 (0.01

公开(公告)号：JPH06326372A

公开(公告)日：1994-11-25

申请号：JP11055393

申请日：1993-05-12

Applicant: TOYOTA MOTOR CORP

Inventor： SAKAI TAKENOBU

IPC: C04B35/49 ,  H01L41/187

Abstract: PURPOSE:To increase the displacement coefficient in the load impressed state neither lowering the Curie temperature nor deteriorating the piezoelectric characteristics by a method wherein the range of composition ratio of respective elements of the piezoelectric material composition is to be specified. CONSTITUTION:The piezoelectric material composition is represented by a formula of Pb1-x-ySrxBay (Zr0.55Ti0.45-zSbz)O3 where 0.09

公开(公告)号：JPH06224486A

公开(公告)日：1994-08-12

申请号：JP1083093

申请日：1993-01-26

Applicant: TOYOTA MOTOR CORP

Inventor： SAKAI TAKENOBU

IPC: C04B35/49 ,  H01L41/257 ,  H01L41/24

Abstract: PURPOSE:To easily form piezoelectric ceramics in which an aging change of a residual polarization is prevented. CONSTITUTION:A first polarizing step of polarizing piezoelectric ceramics by applying a voltage reverse to a voltage applying direction necessary to obtain a polarizing direction to be obtained to the ceramics, and a second polarizing step of polarizing the ceramics polarized in a reverse direction by applying a voltage of the voltage applying direction necessary to obtain a polarizing direction to be obtained are conducted. It is surmised that an internal bias electric field is generated by previously applying the voltage in the reverse direction, and it is considered that this field suppresses 90 deg. switching of a domain.

公开(公告)号：JPH06120582A

公开(公告)日：1994-04-28

申请号：JP26867092

申请日：1992-10-07

Applicant: TOYOTA MOTOR CORP

Inventor： SAKAI TAKENOBU

IPC: C04B35/49 ,  C04B35/491 ,  H01L41/257 ,  H01L41/24

Abstract: PURPOSE:To make it possible to control the 90 deg. switching of domain and thus the reduction of displacement of piezoelectric ceramics by polarizing the ceramics of granular structure while applying pressure thereto in the direction perpendicular to that of polarization. CONSTITUTION:In polarizing piezoelectric ceramics of granular structure, typified by PZTs, applying pressure in the direction perpendicular to that of polarization makes it easier to align polarization axes in the direction perpendicular to that of pressure application, that is, in the direction of electric field, by means of mechanical force. Polarization by the method increases the amount of polarization axes aligned in the direction of electric field, and accordingly the amount of residual polarization axes after the removal of the electric field is also increased. In thus polarized piezoelectric ceramics, therefore, the 90 deg. switching of domain is effectively controlled even in use under condition of high temperature, high voltage or high pressure. This makes it possible to control the degradation of piezoelectric distortion constant and prevent the reduction of displacement.

公开(公告)号：JPH05139828A

公开(公告)日：1993-06-08

申请号：JP12883692

申请日：1992-05-21

Applicant: TOYOTA MOTOR CORP

Inventor： SAKAI TAKENOBU ,  ISHIKIRIYAMA MAMORU

IPC: C04B35/49

Abstract: PURPOSE:To readily and stably obtain a piezoelectric ceramic having excellent durability to driving by adding a specific amount of lanthanum element when PbTiO3-PbZrO3 based piezoelectric ceramic is produced. CONSTITUTION:Powder containing each powder of PbO, TiO3 and ZrO2 at prescribed ratio is mixed together with water by a ball mill and dehydrated, dried and calcined to afford powdery raw material. The powder is again charged in the ball mill and a prescribed amount of La2O3 powder is added to the powder and these components are mixed in wet state and dehydrated and dried to give a PZT powdery raw material. A binder is added to the raw material to granulate the raw material and the granulate is formed to afford a formed product. The forming is carried out so that 1-5mol% tantalum is contained in 100mol% total amount of lead element in the formed body, which body is heated and retained and sintered in a density lower than ideal density to provide a primary sintered compact. The sintered compact is subjected to HIP treatment which is sintered under high temperature and high pressure and the resultant sintered compact is subjected to after-processing. By the method, grain diameter of the primary sintered compact can be minimized to provide the objective piezoelectric ceramic.

公开(公告)号：JPH04224111A

公开(公告)日：1992-08-13

申请号：JP41252990

申请日：1990-12-20

Applicant: KOKUSAI CHODENDO SANGYO GIJUTS ,  NGK INSULATORS LTD ,  TOYOTA MOTOR CORP

Inventor： OGAWA NAOYUKI ,  SAKAI TAKENOBU ,  HIRABAYASHI IZUMI

IPC: C01G3/00 ,  C01G1/00 ,  C04B35/00 ,  C04B35/45 ,  C04B35/653 ,  H01B12/00 ,  H01L39/12 ,  H01L39/24

Abstract: PURPOSE:To produce a rare earth type oxide superconductor showing excellent critical current density even in a high magnetic field by the easily operable conventional melting method. CONSTITUTION:The superconductor is a rare earth type oxide superconductor and can be produced by a melting method. This superconductor contains, uniformly and dispersedly, at least one element component among Rh, Pt, Pd, Ru, and Os by 0.01-5wt.% on the basis of element or Sc element component by 1-3wt.% on the basis of element in the crystal of a BEBa2Cu3OY (where BE represents Y, Gd, Dy, Ho, Er, or Yb) oxide superconductor.

公开(公告)号：JPS63199099A

公开(公告)日：1988-08-17

申请号：JP3222487

申请日：1987-02-13

Applicant: TOYOTA MOTOR CORP

Inventor： SAKAI TAKENOBU

IPC: B30B5/02 ,  B22F3/04 ,  B30B11/00

Abstract: PURPOSE:To form an uniform forming body with high density by imparting a hydrostatic pressure under imparting ultrasonic vibration on the hydrostatic pressurizing die filling up a powder. CONSTITUTION:An ultrasonic generation element 4 is provided in a hydrostatic pressure device 1 and the flexible rubber die 5 packing a powder 6 in the liquid is arranged. An ultrasonic vibration is transmitted via a medium by actuating the ultrasonic generation element 4 by pressurizing with a water leading pump 3, discharging valve 2 and press 8. The powder uniformly packed is thus uniformly pressurized, the particles inside a forming die are coagulated in arrangement with vibrating by the ultrasonic vibration to remove the enclosed air, etc., from the powder body inner part and the uniform forming body of high density having no generation of the uneven density at the inner and outer parts of the forming body is obtd.

公开(公告)号：JPS6321256A

公开(公告)日：1988-01-28

申请号：JP16578486

申请日：1986-07-15

Applicant: TOYOTA MOTOR CORP

Inventor： SAKAI TAKENOBU

IPC: C04B35/584 ,  C04B35/58 ,  C04B35/80 ,  C04B35/81

公开(公告)号：JPS6272571A

公开(公告)日：1987-04-03

申请号：JP21093685

申请日：1985-09-26

Applicant: TOYOTA MOTOR CORP

Inventor： SAKAI TAKENOBU

IPC: B28B11/00 ,  C04B35/638 ,  C04B35/64