INVESTIGATION OF SURFACE PHENOMENA WITH ELECTRON MIRROR MICROSCOPY
Abstract
The electron mirror microscope was used to observe monolayers of long chain, polar organic compounds deposited on smooth metallic substrates. A 24.4 angstroms step from the uncovered substrate to a compact monolayer of barium stearate was readily detected as were wear tracks created by normal loads as small as 10 mg. Thin surface films on Ti wereree surfaces: clean Ti, oxide coated Ti, and Ti coated with monolayers of polar organic compounds. Sputter clea ed Ti samples exhibited friction coefficients in high vacuum of 2.0 independent of load. A load effect wa observed when thermal oxide layers were applied o Ti, the friction coefficient studied with light load friction experiments in a vacuum. samples were prepared by mechanical polishing followed by sputter cleaning. Experiments were conducted with three surfaces: clean Ti, oxide coated Ti, and Ti coated with monolayers of polar organic compounds. Sputter clea ed Ti samples exhibited friction coefficients in high vacuum of 2.0 independent of load. A load effect wa observed when thermal oxide layers were applied o Ti, the friction coefficient being higher at light loads than at heavier loads. As the oxide thickness increased, heavier loads were required to form a wear track visible by optical microscopy. Fricting vapor pressure to a minimum value at 200-300 microns Hg. The coefficient was independent of load in the 200-400 mg range. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1962
- Accession Number
- AD0278203
Entities
People
- A.a. Anderson
- R.c. Menard
- W.w. Roepke