Coating processes – Electrical product produced – Piezoelectric properties
Patent
1995-10-02
1997-08-26
Utech, Benjamin
Coating processes
Electrical product produced
Piezoelectric properties
427294, 4273762, B05D 512
Patent
active
056608772
ABSTRACT:
A process for fabricating a fully dense ceramic preform for a piezoelectric or electrostrictive composite exhibiting anisotropic 3--3 connectivity. The process involves preparing a homogeneous slurry of a piezoelectric ceramic powder, a binder, dispersant, and a liquid medium. The slurry is freeze dried to form a ceramic preform having ceramic interconnected lamelli having greater connectivity in the Z direction than in the X and Y direction, and having interconnected interlamellar regions. The composite is fabricated by infiltrating the fully dense ceramic preform with an infiltrate phase in the interconnected interlamellar regions. The composite may be poled to produce a piezoelectric composite for electromechanical devices exhibiting anisotropic 3-3 connectivity.
REFERENCES:
patent: 4122041 (1978-10-01), Mahler
patent: 4227111 (1980-10-01), Cross et al.
patent: 4330593 (1982-05-01), Shrout et al.
patent: 5539965 (1996-07-01), Safari et al.
R. E. Newnham et al., "Composite Piezoelectric Transducers," in Materials in Engineering, vol. 2, Dec. 1980, pp. 93-106.
"Freeze-formed Silica Fibres", W. Mahler, et al., May 1980, Central Research & Development Dept., E.I. duPont de Nemours & Company, Wilmington, Delaware 19898.
"Injection Molded Fine-Scale Piezoelectric Composite Transducers", LJ Bowen, et al. 1993 Ultrasonics Symposium, 1993 IEEE, pp. 499-503.
"Modeling 1-3 Composite Piezoelectrics: Thickness-Mode Oscillations", WA Smith, BA Auld, IEEE Trans. on Ultrasonics Ferroelectrics and Frequency Control, vol. 38, No. 1, Jan. 1991.
"Properties of Composite Piezoelectric Materials for Ultrasonic Transducers", WA Smith, et al., 1984 Ultrasonics Symposium, IEEE 1984, pp. 539-544.
"The Role of Piezocomposites in Ultrasonic Transducers", WA Smith, 1989 Ultrasonics Symposium, 1989 IEEE, pp. 755-766.
"Development of 1-3 Ceramic-Air Composite Transducers", C. Oakley, et al., SPIE vol. 1733 (1992) pp. 274-283.
"PZT-Epoxy Piezoelectric Transducers: A Simplified Fabrication Procedure", HP Savakus, et al., Mat. Res. Bulletin, vol. 26, pp. 677-680, 1981.
Smith Lowell Scott
Venkataramani Venkat Subramaniam
General Electric Company
Johnson Noreen C.
Pittman William H.
Utech Benjamin
LandOfFree
Method for fabricating lamellar piezoelectric preform and compos does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for fabricating lamellar piezoelectric preform and compos, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for fabricating lamellar piezoelectric preform and compos will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1986662