公开(公告)号：JP2003104796A

公开(公告)日：2003-04-09

申请号：JP2002117721

申请日：2002-04-19

Applicant: TOYOTA MOTOR CORP ,  JAPAN FINE CERAMICS CT ,  DENSO CORP ,  AISIN SEIKI

Inventor： SAKAI TAKENOBU ,  YAMADA TATSUYA ,  NAGAYA TOSHIATSU ,  KAWACHI HIDEOMI ,  NAKAI KIYOTAKA

IPC: C30B29/32

Abstract: PROBLEM TO BE SOLVED: To provide a method for manufacturing barium titanate single crystal capable of obtaining a large one with an economical cost, and to provide a barium titanate single crystal. SOLUTION: The method for manufacturing the barium titanate single crystal is characterized in that a barium titanate multicrystalline body, the Ba/Ti ratio of which is in a range of 0.9980-1.0000 in molar ratio, and the single crystal are heated at a temperature of

公开(公告)号：JP2002285003A

公开(公告)日：2002-10-03

申请号：JP2001085650

申请日：2001-03-23

Applicant: TOYOTA MOTOR CORP ,  ADMATECHS CO LTD

Inventor： SAKAI TAKENOBU ,  ABE SAN ,  YO TAKESHI

IPC: C08L101/00 ,  C08K3/22 ,  C08K9/04

Abstract: PROBLEM TO BE SOLVED: To provide a filler-containing slurry composition capable of uniformly dispersing fillers in a matrix resin by appropriately selecting the shape of oxide fine particles used as fillers and the embodiment of charging the particles in the matrix resin. SOLUTION: The filler-containing slurry composition is constructed by that almost spherical oxide fine particles are used as fillers and the fillers are dispersed in an organic solvent. Since the filler-containing slurry composition has low-viscosity even if the concentration of fillers is high, the workability in an operation of mixing fillers with the matrix resin is improved, or the fillers can be uniformly dispersed in the matrix resin. By subjecting the fillers to a surface treatment or by further adding a precipitation inhibitor for fillers to the composition, more uniform dispersion of fillers in the matrix resin can be attained, or the storage property of the slurry composition itself is more improved.

公开(公告)号：JP2002212422A

公开(公告)日：2002-07-31

申请号：JP2001009484

申请日：2001-01-17

Applicant: TOYOTA MOTOR CORP ,  NIPPON STEEL CORP

Inventor： SHIBATA YASUFUMI ,  SAKAI TAKENOBU ,  KATAYAMA SHINGO ,  YAMADA NORIKO

IPC: C08J5/14 ,  C08G77/58 ,  C08K3/00 ,  C08K3/28 ,  C08K3/34 ,  C08K3/38 ,  C08L83/04

Abstract: PROBLEM TO BE SOLVED: To provide a material having high elasticity and lipophilicity as well as heat resistance and heat conductivity, and suitable for slide members such as piston rings. SOLUTION: This inorganic-organic hybrid material comprises a polysiloxane and an inorganic powder dispersed in the polysiloxane matrix. At least part of Si contained in the polysiloxane is bonded with a phenyl group, and a 1-8C alkyl or fluoroalkyl group. It is preferable that the phenyl group/Si molar ratio is 1/10-9/10, the alkyl or fluoroalkyl group/Si molar ratio is 9/10-1/10, the material has an elongation of at least 15%, 5-20 mol% of the Si is replaced with Ti, Ta or Zr, and the friction coefficient of boundary lubrication is

公开(公告)号：JPH0826825A

公开(公告)日：1996-01-30

申请号：JP16381094

申请日：1994-07-15

Applicant: TOYOTA MOTOR CORP

Inventor： TERAI YOICHI ,  SAKAI TAKENOBU

IPC: C04B35/49 ,  H01L41/187

Abstract: PURPOSE:To produce a piezoelectric porcelain composition having a high strength. CONSTITUTION:This piezoelectric porcelain composition for actuator has a composition represented by the following formula: Pb1-a-b-c-dLaaPbBacSrd(SrxTi1-x-y--zNyMz)O3 [P is at least one or more of Pr, Nd and Sm; N is at least one or more of In, Fe, Co and Ga; M is at least one or more of Sb and Nb; 0.0025

公开(公告)号：JPH07318647A

公开(公告)日：1995-12-08

申请号：JP13628494

申请日：1994-05-26

Applicant: TOYOTA MOTOR CORP

Inventor： SAKAI TAKENOBU ,  OKAZAKI TOSHIHIRO ,  MUKOYAMA YOSHIO

IPC: G01S15/60

Abstract: PURPOSE:To enhance the detection accuracy of an ultrasonic ground vehicle speed sensor and the transmission performance of an ultrasonic transmitter by reducing the adverse effect of side lobe on the detection accuracy. CONSTITUTION:An ultrasonic transmitter 30 transmits an ultrasonic wave of predetermined frequency toward a pavement and receives a reflected wave in order to determine a vehicle speed based on a Doppler frequency. the ultrasonic transmitter 30 comprises an oscillator 34 oscillating at a predetermined frequency, an acoustic matching unit 36 bonded to the oscillator in order to transmit the oscillation thereof into the air, and a casing 42 bonded to the acoustic matching unit around the oscillator and supporting the acoustic matching unit. Rigidity of the acoustic matching unit 36 is set lower on the pavement side with respect to the oscillator than on the opposite side through a groove 46, for example.

公开(公告)号：JPH0687646A

公开(公告)日：1994-03-29

申请号：JP23449392

申请日：1992-09-02

Applicant: TOYOTA MOTOR CORP

Inventor： SAKAI TAKENOBU

IPC: C04B35/00 ,  C04B35/49 ,  C04B35/64

Abstract: PURPOSE:To inexpensively produce a piezoelectric ceramic with the piezoelectric characteristic and strength improved and their variance reduced. CONSTITUTION:A piezoelectric ceramic compact is sintered in the presence of the lead-atmosphere powder and oxygen-atmosphere powder to produce a piezoelectric ceramic. The oxygen-atmosphere powder consists of an peroxide inert to the piezoelectric ceramic compact and is arranged under or around the compact as the seat powder or covering powder. Since the oxygen- atmosphere powder is inert to the compact, the piezoelectric characteristic and strength are not lowered. Meanwhile, as oxygen is generated from under or around the compact, a uniform oxygen atmosphere is formed around the compact, and the sintered compact is densified to improve and uniformize its piezoelectric characteristic and strength. The peroxide liberates oxygen in sintering and recombines with oxygen when cooled to form the reusable peroxide.

公开(公告)号：JPH05114760A

公开(公告)日：1993-05-07

申请号：JP27429291

申请日：1991-10-22

Applicant: TOYOTA MOTOR CORP

Inventor： YAMAZAWA YASUSHI ,  SAKAI TAKENOBU ,  SHIMAZAKI RYUJI

IPC: F16K31/02 ,  H01L41/083 ,  H01L41/09

Abstract: PURPOSE:To provide a method of driving a piezoelectric actuator, where the actuator can be enhanced in durability. CONSTITUTION:A positive voltage (electric field intensity) b is applied to a piezoelectric actuator to put it in an expansion state, and a positive bias voltage (electric field intensity) a lower than the positive voltage b is applied to put the actuator in a shrinkage state. The positive voltage b becomes higher with the positive bias voltage a. In constitution, an electric field applied to the piezoelectric actuator is far from a region of low electric field where a piezoelectric material deteriorates sharply in quantity of polarization, so that the reduction of a piezoelectric pellet in quantity of polarization correspondent to the displacement of the pellet is kept smaller than conventionally, and in result a piezoelectric actuator of this design can be restrained from deteriorating in polarization.

公开(公告)号：JPH01126274A

公开(公告)日：1989-05-18

申请号：JP28466187

申请日：1987-11-11

Applicant: TOYOTA MOTOR CORP

Inventor： SAKAI TAKENOBU

IPC: C04B35/584

Abstract: PURPOSE:To greatly improve a fracture toughness value and to obtain a silicon nitride composite body adequate as mechanical structural parts by dispersing silicon carbide whiskers provided with boron carbide coating layers on the surfaces into a silicon nitride matrix. CONSTITUTION:The coating layers of the boron carbide (B4C) are provided on the surfaces of the silicon carbide whiskers of the silicon nitride composite body formed by dispersing the silicon carbide (SiC) whiskers into the silicon nitride (Si3N4) matrix. The thickness of the coating layers of said B4C is preferably specified to 50-900Angstrom , more preferably 200-800Angstrom . The reason for such limitation lies in that the effect of improving the fracture toughness value is small if the layers are too thin and that the fracture toughness value is degraded on the contrary by the too large influence of the B4C if the layers are too thick. The B4C of the surface of SiC whiskers of this silicon nitride composite body reacts and the SiC whiskers bond three-dimensionally to each other at the time of sintering. The sinterability is thus upgraded and the fracture toughness value is improved.

公开(公告)号：JPS63162583A

公开(公告)日：1988-07-06

申请号：JP30878886

申请日：1986-12-26

Applicant: TOYOTA MOTOR CORP

Inventor： SAKAI TAKENOBU

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

公开(公告)号：JPS63159257A

公开(公告)日：1988-07-02

申请号：JP30510886

申请日：1986-12-20

Applicant: TOYOTA MOTOR CORP

Inventor： TAKAHASHI AKIHIRO ,  SAKAI TAKENOBU

IPC: C04B35/591 ,  C04B35/58