Accession Number : ADA184283

Title :   Calculation of the Tribological Properties of Surfaces by Semi-Empirical Methods.

Descriptive Note : Technical rept.,

Corporate Author : FRANK J SEILER RESEARCH LAB UNITED STATES AIR FORCE ACADEMY CO

Personal Author(s) : Swanson,Jon T ; Stewart,James J

PDF Url : ADA184283

Report Date : Jul 1987

Pagination or Media Count : 10

Abstract : One method of increasing the performance of aircraft engines is to operate the engines at higher temperatures. A critical technology in this application is lubrication at high temperatures. A thorough understanding of solid lubrication of ceramic materials is therefore required. This report details our initial attempts at preparing a semi-empirical quantum chemical model of solid lubricants. In our initial study we focused on two areas of the problem. The first area was to determine the best approach to treating a model surface or lubricant. The selection was governed by providing a reasonable model without requiring an unreasonable amount of computer time for each calculation. The second area concerned obtaining an estimate of the ability of the above models to calculate the relatively weal interactions which occur between surfaces and lubricants, and between the lubricants themselves. Our first concern was to reproduce the trends, rather than obtain the absolute values in these interactions.

Descriptors :   *SOLID LUBRICANTS, *TRIBOLOGY, AIRCRAFT ENGINES, COMPUTATIONS, DIAMONDS, ESTIMATES, GRAPHITE, ADSORPTION, SURFACES, ATOMS

Subject Categories : Lubricants and Hydraulic Fluids
      Physical Chemistry
      Aircraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE