Bonded ultrasonic transducer and method for making

Patent · Sun Jan 01 00:00:00 EST 1995

OSTI ID:870152

Dixon, Raymond D ^[1]; Roe, Lawrence H ^[1]; Migliori, Albert ^[2]

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1. Los Alamos, NM
2. Santa Fe, NM

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.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• DOE Contract Number: W-7405-ENG-36
• Assignee: Regents of University of California, Office of Technology (Alameda, CA)
• Patent Number(s): US 5465897
• OSTI ID: 870152
• Country of Publication: United States
• Language: English

Related Subjects

bonded
ultrasonic
transducer
method
formed
diffusion
assembly
piezoelectric
crystal
material
optionally
ceramic
wear
surface
mating
surfaces
component
silver
films
application
pressure
heat
coated
reactive
metal
hafnium
increase
adhesion
deposited
thickness
00635
form
substantially
non-compliant
bond
resulting
free
self-resonances
normal
operating
ranges
taking
resonant
ultrasound
measurements
operating range
resonant ultrasound
mating surface
active metal
substantially free
ultrasonic transducer
reactive metal
transducer assembly
normal operating
piezoelectric crystal
wear surface
mating surfaces
diffusion bonded
fusion bond
sound measurement
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