Bonded ultrasonic transducer and method for making

Patent · Sat Dec 31 23:00:00 EST 1994

OSTI ID:870152

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

---

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
• 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

/228/
00635
active metal
adhesion
application
assembly
bond
bonded
ceramic
coated
component
crystal
deposited
diffusion
diffusion bonded
films
form
formed
free
fusion bond
hafnium
heat
increase
material
mating
mating surface
mating surfaces
measurements
metal
method
non-compliant
normal
normal operating
operating
operating range
optionally
piezoelectric
piezoelectric crystal
pressure
ranges
reactive
reactive metal
resonant
resonant ultrasound
resulting
self-resonances
silver
sound measurement
substantially
substantially free
surface
surfaces
taking
thickness
transducer
transducer assembly
ultrasonic
ultrasonic transducer
ultrasound
wear
wear surface