Accession Number : ADD008031

Title :   Apparatus for Securing a Ferroelectric Stack to a Weighted Projection Surface.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Holloway,Jack W

Report Date : 21 Oct 1980

Pagination or Media Count : 5

Abstract : A coupling ring is bonded onto the opposite ends of a ferroelectric stack having substantially the same thermal expansion coefficient as the stack. A thin film of silicone compound is wiped onto the axially exposed surfaces of the rings and surfaces provided in a head and a tail mass are configured to mate with them. A plurality of microspheres are mixed uniformly through a liquid adhesive and this mixture is coated onto the suitably shaped surfaces on the head and tail mass. A stress rod reaching between the head and tail mass axially compresses the ferroelectric stack and excess adhesive mixture is squeezed from between the mating surfaces. The thickness of the liquid adhesive is restricted to the diameter of the microspheres to ensure a high impedance match and upon applying the proper amount of heat, rigid joints are set up between the now hardened adhesive and the head and tail mass. Nonrigid joints are created across the silicone compound films to create an optimum impedance match between the ferroelectric stack and the masses and to prevent the transfer of self-destructive tensile strains as the head and tail masses change dimensions in response to changing ambient temperatures. (author)

Descriptors :   *Patents, *Ferroelectric materials, *Stacking, Transducers, *Adhesive bonding, *Bonded joints, Adhesives, Thermal expansion

Subject Categories : Electrical and Electronic Equipment
      Adhesives, Seals and Binders
      Couplers, Fasteners, and Joints
      Mfg & Industrial Eng & Control of Product Sys

Distribution Statement : APPROVED FOR PUBLIC RELEASE