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Auger electron spectroscopy study of oxidation of a PdCr alloy used for high-temperature sensorsA 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.
Document ID
19930014229
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Boyd, Darwin L. (Kent State Univ. OH., United States)
Zeller, Mary V. (NASA Lewis Research Center Cleveland, OH, United States)
Vargas-Aburto, Carlos (Kent State Univ. OH., United States)
Date Acquired
September 6, 2013
Publication Date
March 1, 1993
Subject Category
Metallic Materials
Report/Patent Number
NASA-TM-106212
E-7538
NAS 1.15:106212
Report Number: NASA-TM-106212
Report Number: E-7538
Report Number: NAS 1.15:106212
Accession Number
93N23418
Funding Number(s)
PROJECT: RTOP 763-22-51
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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