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MS212--A Homogeneous Sputtered Solid Lubricant Coating for Use to 800 CComposite coatings containing chromium carbide, stable fluorides and silver were prepared by magnetron sputtering. The microstructure of the coatings is very homogeneous compared to that of plasma sprayed and sintered versions of the same chemical composition. Friction and wear of MS212-coated and baseline uncoated aluminum and Inconel X-750 are compared. At room temperature, the friction and wear of coated aluminum is dramatically better compared to the baseline. The acceptable load is limited by deformation of the soft aluminum substrate. In the case of the nickel alloy, lower friction is observed for the coated alloy at all temperatures up to the maximum test temperature of 800 C. Pin wear factors for sliding against the coated alloy are lower than the baseline at room temperature and 350 C, and comparable to baseline wear at higher test temperatures. Low baseline wear at high temperatures is due to the lubricious nature of the natural oxides formed on nickel-chromium alloys in a hot, oxidizing atmosphere. No load limit was found for coated Inconel X-750 at loads up to five times the load limit for coated aluminum.
Document ID
19970026597
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Sliney, Harold E. (NASA Lewis Research Center Cleveland, OH United States)
Waters, William J. (OMNI Corp. Cleveland, OH United States)
Soltis, Richard (OMNI Corp. Cleveland, OH United States)
Date Acquired
September 6, 2013
Publication Date
May 1, 1997
Subject Category
Nonmetallic Materials
Report/Patent Number
NASA-TM-107437
NAS 1.15:107437
E-10699
Accession Number
97N25846
Funding Number(s)
PROJECT: RTOP 243-30-07
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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