Accession Number : ADA288672

Title :   Fabrication of Electrostrictive Ceramic Rings for Navy Sonar Transducers.

Descriptive Note : Final rept. 19 Sep 93-19 Mar 94,

Corporate Author : NAVAL RESEARCH LAB ORLANDO FL UNDERWATER SOUND REFERENCE DIV

Personal Author(s) : Jang, Sei-Joo ; Shrout, Thomas R.

PDF Url : ADA288672

Report Date : 19 MAR 1994

Pagination or Media Count : 7

Abstract : The higher order electromechanical coupling "electrostriction" has been proposed as an alternative to the piezoelectric phenomena commonly employed for Navy-type sonar transducers. Based on the results of the parent program, "Relaxor Ferroelectrics for Electrostrictive Transducers" (N00014-90-J-4077), and the continuation program, "Micro-Mechanics of Electrostrictors for Sonar Transducers," three compositions of electrostrictive ceramics were fabricated into large rings and delivered. Specific compositions (3) were selected based on the given criteria: Large E-fleld induced strain >0.03% Operating temperature range O-30C Minimal strain-E-fleld hysteresis (< 10%) The large rings (4 each) were fabricated with the following dimensions: O.D. = 2.000 i 0.01 in. (50.8 mm), wall thickness = 0.250 i 0.010 in. (6.35 mm), and thickness = 0.430 i 0.002 (10.9 mm). The four rings were electroded (fired on silver) and to be stacked into an assembly for standard testing and evaluation.

Descriptors :   *CERAMIC MATERIALS, *ELECTROSTRICTION, *SONAR TRANSDUCERS, TEST METHODS, PIEZOELECTRICITY, LEAD TITANATES, STANDARDIZATION, RINGS, FERROELECTRIC MATERIALS, NAVAL EQUIPMENT, HYSTERESIS.

Subject Categories : Ceramics, Refractories and Glass
      Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE