TIME TEMPERATURE INTEGRATION DEVICE

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)

Document Details

Document Type
Technical Report
Publication Date
Dec 15, 1961
Accession Number
AD0271416

Entities

Organizations

  • General Electric

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Aircraft Engines
  • Aircrafts
  • Composite Materials
  • Diffusion
  • Electrical Resistance
  • Energy
  • Engines
  • Heat Of Activation
  • Jet Aircraft
  • Lightweight
  • Manufacturing
  • Prototypes
  • Resistance

Readers

  • Combustion science or combustion engineering.
  • Database Systems and Applications
  • Materials Science and Engineering.