Accession Number:

AD0271416

Title:

TIME TEMPERATURE INTEGRATION DEVICE

Descriptive Note:

Corporate Author:

GENERAL ELECTRIC CO WEST LYNN MASS

Personal Author(s):

Report Date:

1961-12-15

Pagination or Media Count:

27.0

Abstract:

The development is reported of a small, lightweight device which when placed in the exhaust stream of a jet aircraft engine would integrate its time-temperature history for possible correlation with engine aging. A limited number of prototypes were produced. Performance of the device was based upon the change in electrical resistance of a Pd-Pt composite as a result of the mutual solid state diffusion of those metals. The integrating elements in the prototypes consisted of a 50-layer roll-bonded composite containing alternthe device does integrate its time-temperature history, and isothermal tests have shown the prototype activation energy to be about 31,000 calories per mole. This activation energy was lower than expected, but was higher for the prototypes than for the unclad test specimens 22,000. The mechanism by which the manufacturing process increased the activation energy is not clear. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE