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Title: Bonded ultrasonic transducer and method for making

An ultrasonic transducer is formed as a diffusion bonded assembly of piezoelectric crystal, backing material, and, optionally, a ceramic wear surface. The mating surfaces of each component are silver films that are diffusion bonded together under the application of pressure and heat. Each mating surface may also be coated with a reactive metal, such as hafnium, to increase the adhesion of the silver films to the component surfaces. Only thin silver films are deposited, e.g., a thickness of about 0.00635 mm, to form a substantially non-compliant bond between surfaces. The resulting transducer assembly is substantially free of self-resonances over normal operating ranges for taking resonant ultrasound measurements. 12 figs.
Inventors:
; ;
Issue Date:
OSTI Identifier:
131912
Assignee:
Univ. of California, Office of Technology Transfer, Alameda, CA (United States) PTO; SCA: 420500; PA: EDB-95:157382; SN: 95001485790
Patent Number(s):
US 5,465,897/A/
Application Number:
PAN: 8-220,306
Contract Number:
W-7405-ENG-36
Resource Relation:
Other Information: PBD: 14 Nov 1995
Research Org:
University of California
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; ULTRASONIC TESTING; TRANSDUCERS; DESIGN; PIEZOELECTRICITY; FABRICATION

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