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Electron microscope observations of impact crater debris amongst contaminating particulates on materials surfaces exposed in space in low-Earth orbitDebris particles extracted from a small sampling region on the leading edge of the Long Duration Exposure Facility (LDEF) spacecraft have been examined by analytical transmission electron microscopy and the elemental frequency observed by energy-dispersive X-ray spectrometry and compared with upper atmosphere (Earth) particle elemental frequency and the average elemental compositions of interplanetary dust particles. A much broader elemental distribution was observed for the exposed spacecraft surface debris milieu. Numerous metal microfragment analyses, particularly aluminum and stainless steel, were compared with scanning electron microscope observations-of impact crater features, and the corresponding elemental spectra on selected LDEF aluminium tray clamps and stainless steel bolts. The compositions and melt features for these impact craters and ejecta have been shown to be consistent with microcrystalline debris fragments in the case of aluminum, and these observations suggest an ever changing debris milieu on exposed surfaces for space craft and space system materials.
Document ID
19940034180
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Murr, L. E. (NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Rivas, J. M. (NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Quinones, S. (NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Niou, C.-S. (NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Advani, A. H. (NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Marquez, B. (Texas Univ. El Paso, United States)
Date Acquired
August 16, 2013
Publication Date
September 1, 1993
Publication Information
Publication: Journal of Materials Science
Volume: 28
Issue: 17
ISSN: 0022-2461
Subject Category
SPACECRAFT DESIGN, TESTING AND PERFORMANCE
Funding Number(s)
CONTRACT_GRANT: NAG9-481
Distribution Limits
Public
Copyright
Other