ULTRAHIGH VACUUM ADHESION OF COMMINUTED BASALT ROCK TO METALS.
Abstract
The strength and nature of the forces of adhesion between soils of basaltic composition and 304 stainless steel and 2024 T-4 aluminum in an ultrahigh vacuum of 10 to the minus 10th power torr were determined experimentally. For fine grained soils, forces of up to 495 dynes/sq cm were measured. These forces are consistent with values of Van der Waals forces calculated using a Lifshitz expression when the thickness and attenuating effect of the metallic oxides are taken into account. The possibility of electrostatic and chemical bonds being present could not be completely eliminated, and the likely existence of electrostatic bonds is demonstrated in some cases. Possible implications for lunar surface operations are discussed. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1968
- Accession Number
- AD0675138
Entities
People
- Howard E. Selheimer
- Stewart W. Johnson
Organizations
- Air Force Institute of Technology