Accession Number : ADB000048

Title :   Improved High-Temperature Solid Film Lubricants. Part IV.

Descriptive Note : Final technical rept. 1 Apr 73-30 Jun 74,

Corporate Author : MIDWEST RESEARCH INST KANSAS CITY MO

Personal Author(s) : Hopkins, Vern ; Lavik, Melvin T.

Report Date : OCT 1974

Pagination or Media Count : 115

Abstract : Exploratory development work was conducted on new and improved solid lubricant materials. Two self-lubricating composite formulations were prepared in sufficient quantities for friction and wear evaluation and related data collection; additional exploratory formulations were also prepared. Formulation CID-100 consists of M0S2 + Sb2O3 in a carbonized phenolic resin (CPR) matrix, whereas formulation CID-101 includes graphite fibers as an additional ingredient. Specimens were prepared with 5.4, 10.3, 14.7, and 18.7% (Vol) graphite fibers. Factors such as weight loss during carbonization, specific gravity, and thermogravimetric characteristics were investigated. Five new experimental formulations were prepared. Composites prepared on this program were bench tested in an air environment and composites developed on an earlier subcontract were tested in a vacuum environment. Measurement of the friction and wear properties in air of the two selected formulations was performed primarily on three types of test devices; the oscillatory slider, the high-speed, low-load journal, and the low-speed, high-load journal. Only on the low-speed journal at loads of 1,500, 3,000, and 6,000 psi and a speed of 20 fpm was the wear rate of CID-101 composites shown to be lower than that of the CID-100. Two specimens, fabricated as ball bearing retainer rings and tested in a ball bearing assembly, exhibited little wear, but failed in less than 20 hr due to fracture. Two of the experimental samples showed excellent friction and wear characteristics in low-load, high-speed unidirectional and in high-load, low-speed oscillatory sliding.

Descriptors :   (*SOLID LUBRICANTS, COMPOSITE MATERIALS), HIGH TEMPERATURE, FILMS, SELF LUBRICATION, FRICTION, WEAR RESISTANCE, MOLYBDENUM COMPOUNDS, STRONTIUM COMPOUNDS, PHENOLIC PLASTICS, MATRIX MATERIALS, REINFORCED PLASTICS, CARBON FIBERS, GRAPHITE, TEST EQUIPMENT, BEARINGS, JOURNAL BEARINGS, SLIDING CONTACTS, OSCILLATORS, AIR, VACUUM, FIBER REINFORCED COMPOSITES.

Subject Categories : Lubricants and Hydraulic Fluids

Distribution Statement : APPROVED FOR PUBLIC RELEASE