Auger electron spectroscopy study of oxidation of a PdCr alloy used for high-temperature sensors

Technical Report · Mon Mar 01 04:00:00 EST 1993

OSTI ID:6465291

Boyd, D L; Zeller, M V; Vargas-Aburto, C

A Pd-13 wt. percent Cr solid solution is a promising high-temperature strain gage alloy. In bulk form it has a number of properties that are desirable in a resistance strain gage material, such as a linear electrical resistance versus temperature curve to 1000 C and stable electrical resistance in air at 1000 C. However, unprotected fine wire gages fabricated from this alloy perform well only to 600 C. At higher temperatures severe oxidation degrades their electrical performance. In this work Auger electron spectroscopy was used to study the oxidation chemistry of the alloy wires and ribbons. Results indicate that the oxidation is caused by a complex mechanism that is not yet fully understood. As expected, during oxidation, a layer of chromium oxide is formed. This layer, however, forms beneath a layer of metallic palladium. The results of this study have increased the understanding of the oxidation mechanism of Pd-13 wt. percent Cr.

• Research Organization: National Aeronautics and Space Administration, Cleveland, OH (United States). Lewis Research Center
• OSTI ID: 6465291
• Report Number(s): N-93-23418; NASA-TM--106212; E--7538; NAS--1.15:106212; CNN: RTOP 763-22-51
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
440800 -- Miscellaneous Instrumentation-- (1990-)
47 OTHER INSTRUMENTATION
ALLOYS
CHEMICAL REACTIONS
CHROMIUM ALLOYS
DISPERSIONS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
MEASURING INSTRUMENTS
MIXTURES
OXIDATION
PALLADIUM ALLOYS
PALLADIUM BASE ALLOYS
PHYSICAL PROPERTIES
PLATINUM METAL ALLOYS
SOLID SOLUTIONS
SOLUTIONS
STRAIN GAGES
TEMPERATURE RANGE
TEMPERATURE RANGE 0400-1000 K
TEMPERATURE RANGE 1000-4000 K
WIRES