Accession Number : ADA243219


Title :   Determination of the Tribological Fundamentals of Solid Lubricated Ceramics. Volume 1. Summary


Descriptive Note : Final rept. Sep 1985-Sep 1989


Corporate Author : HUGHES AIRCRAFT CO EL SEGUNDO CA ELECTRO-OPTICAL AND DATA SYSTEMS GROUP


Personal Author(s) : Gardos, Michael N


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a243219.pdf


Report Date : Nov 1990


Pagination or Media Count : 498


Abstract : The goals, structure and highlights of a recently completed multiyear/multinational research program are described. The main driving force behind this effort was the aim to advance the technology base so engineers can successfully and confidentially design, build and operate solid lubricated ceramic tribocomponents in extreme environments. Specially designed friction and wear testers were employed to perform well-defined model experiment on single crystal and polycrystalline ceramics and solid lubricants. The research led to discoveries such as (1) a lubricious oxide with the shear strength of molybdenum disulfides in vacuum, (2) CVD diamond films with low friction and extraordinarily low wear, (3) intercalated graphites with high tribothermal resistance in vacuum and in air, and (4) a wear equation for silicon nitride ceramics. The fundamental nature of the research was exemplified by ab-initio predictions of the friction coefficient of single crystal diamond sliding against its mating diamond plane, and molecular dynamics calculations on single crystal calcium fluorides and barium fluorides interface shear forces. The test equipment developed for completing the model experiments included an Auger/ESCA tribometer capable of unidirectional and oscillatory sliding at room temperature, a scanning electron microscope (SEM) tribometer designed for oscillatory sliding to 1000 C in vacuum and in partial pressures of reactive gases, an 850 C + dual-rubshoe friction and wear tester employing a rolling contact fatigue rod as one of the sliding specimens, and 850 C + friction/ traction apparatus capable of operating to extraordinary high PV limits.


Descriptors :   *SOLID LUBRICANTS , CALCIUM FLUORIDES , ENVIRONMENTS , MODELS , DYNAMICS , ELECTRON MICROSCOPES , ELECTRONIC SCANNERS , VACUUM , FILMS , DIAMONDS , SINGLE CRYSTALS , GRAPHITE , TEST EQUIPMENT , ROOM TEMPERATURE , CERAMIC MATERIALS , MODEL TESTS , COEFFICIENTS , WEAR , FATIGUE , RODS , EQUATIONS , RANGE(EXTREMES) , OSCILLATION , FRICTION , MOLECULAR PROPERTIES , AUGERS , MOLYBDENUM COMPOUNDS , SULFIDES , SLIDING , FORCE(MECHANICS) , SILICON NITRIDES , SHEAR STRENGTH , PARTIAL PRESSURE , REACTIVE GASES , ROLL , COMPUTATIONS


Subject Categories : Ceramics, Refractories and Glass
      Lubricants and Hydraulic Fluids


Distribution Statement : APPROVED FOR PUBLIC RELEASE