Accession Number : AD0278203

Title :   INVESTIGATION OF SURFACE PHENOMENA WITH ELECTRON MIRROR MICROSCOPY

Corporate Author : GENERAL MILLS INC MINNEAPOLIS MINN

Personal Author(s) : MENARD,R.C. ; ANDERSON,A.A. ; ROEPKE,W.W.

Report Date : APR 1962

Pagination or Media Count : 1

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)

Descriptors :   AMIDES, ANTISEIZE COMPOUNDS, BARIUM COMPOUNDS, BUTYL RADICALS, ELECTRON MICROSCOPES, FILMS, LOW PRESSURE, LUBRICANTS, OXIDES, STEARATES, SURFACES, TEST EQUIPMENT, VAPORS

Distribution Statement : APPROVED FOR PUBLIC RELEASE