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Ion beam deposited protective filmsSputter deposition of adherent thin films on complex geometric surfaces by ion beam sources is examined in order to evaluate three different types of protective coatings for die materials. In the first experiment, a 30 cm diameter argon ion source was used to sputter deposit adherent metallic films up to eight microns thick on H-13 steel, and a thermal fatigue test specimen sputter deposited with metallic coatings one micron thick was immersed in liquid aluminum and cooled by water for 15,000 cycles to simulate operational environments. Results show that these materials do protect the steel by reducing thermal fatigue and thereby increasing die lifetime. The second experiment generated diamond-like carbon films using a dual beam ion source system that directed an eight cm argon ion source beam at the substrates. These films are still in the process of being evaluated for crystallinity, hardness and infrared absorption. The third experiment coated a fiber glass beam shield incorporated in the eight-cm diameter mercury ion thruster with molybdenum to ensure proper electrical and thermal properties. The coating maintained its integrity even under acceleration tests.
Document ID
19810045128
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Mirtich, M. J.
(NASA Lewis Research Center Cleveland, Ohio, United States)
Date Acquired
August 11, 2013
Publication Date
April 1, 1981
Subject Category
Mechanical Engineering
Report/Patent Number
AIAA PAPER 81-0672
Meeting Information
Meeting: International Electric Propulsion Conference
Location: Las Vegas, NV
Country: US
Start Date: April 21, 1981
End Date: April 23, 1981
Sponsors: DGLR, Japan Society for Aeronautical and Space Sciences, AIAA
Accession Number
81A29532
Distribution Limits
Public
Copyright
Other

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