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High Temperature Life Testing of 80Ni-20Cr Wire in a Simulated Mars Atmosphere for the Sample Analysis at Mars (SAM) Instrument Suit Gas Processing System (GPS) Carbon Dioxide ScrubberIn support of the GPS for the SAM instrument suite built by GSFC, a life test facility was developed to test the suitability of 80Ni-20Cr wire, 0.0056 inches in diameter, for use as a heater element for the carbon dioxide scrubber. The wire would be required to operate at 1000 C in order to attain the 800 C required for regeneration of the getter. The wire also would need to operate in the Mars atmosphere, which consists mostly of CO2 at pressures between 4 and 12 torr. Data on the high temperature degradation mechanism of 80Ni-20Cr in low pressure CO2, together with the effects of thermal cycling, were unknown. In addition, the influence of work hardening of the wire during assembly and the potential for catastrophic grain growth also were unknown. Verification of the wire reliability as defined by the mission goals required the construction of a test facility that would accurately simulate the duty cycles in a simulated Mars atmosphere. The experimental set-up, along with the test protocol and results will be described.
Document ID
20090015853
Document Type
Conference Paper
Authors
Gundersen, Cynthia (AMU Engineering Inc. Miami, FL, United States)
Hoffman, Christopher (Ball Aerospace and Technologies Corp. United States)
Munoz, Bruno (Ball Aerospace and Technologies Corp. United States)
Steohenson, Timothy (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Thomas, Walter (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 24, 2013
Publication Date
September 22, 2008
Publication Information
Publication: 25th Space Simulation Conference. Environmental Testing: The Earth-Space Connection
Subject Category
Metals and Metallic Materials
Distribution Limits
Public
Copyright
Public Use Permitted.

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IDRelationTitle20090015851Analytic Primary25th Space Simulation Conference. Environmental Testing: The Earth-Space Connection