Accession Number : AD0736920

Title :   Thermal Shock Test of Capped Piezoelectric Ceramic Tubes.

Descriptive Note : Interim rept.,

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

Personal Author(s) : Groves,I. D. , Jr

Report Date : 24 JAN 1972

Pagination or Media Count : 11

Abstract : Piezoelectric ceramic tubes with capped ends are widely used in the construction of underwater sound transducers, although the ceramic bond between end cap and ceramic tube may be subjected to high stress if the thermal coefficient of expansion for the end-cap material is not approximately the same as that for the ceramic. To investigate the effect of temperature change on this bond, twelve capped ceramic tubes were subjected to a series of temperature changes from -51C to +74C to determine their ability to withstand the resultant stress. The tubes or bonds failed only when the temperature change was rapid and the thermal coefficients of expansions for tubes and caps differed by a factor of about 6. (Author)

Descriptors :   (*UNDERWATER SOUND EQUIPMENT, *PIEZOELECTRIC TRANSDUCERS), (*PIEZOELECTRIC CRYSTALS, THERMAL SHOCK), CERAMIC MATERIALS, PIPES, THERMAL STRESSES, BONDED JOINTS, EPOXY RESINS, LEAD COMPOUNDS, TITANATES, ZIRCONATES

Subject Categories : Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE