Development of Self-Lubricating Composites Utilizing Carbonized Phenolic Matrix.
Abstract
Exploratory development and evaluation has been conducted on self-lubricating composites which utilize a carbonized phenolic resin (CPR) matrix. Composites have been prepared with as much as 38% (vol.) graphite fibers. Specimens have been compression-molded directly as journal liners within a metal housing or as blanks which can be machined into desired test configurations. Additives such as Sb2O3, ZnO, and tetrafluoroethylene powders have provided beneficial synergistic effects within the CPR-MoS2-fiber composites. Screening friction and wear tests have been conducted. The composites with more than 30% fiber performed better at the high loads than those with lower fiber content. Small quantities of tetrafluoroethylene powder (2%) effected a lower, more steady friction coefficient while maintaining a low wear rate. Oscillatory journal bearing tests have been conducted at loads from 2,000 to 10,000 psi at an average linear speed of 2.18 fpm (0.011 m/s) and at temperatures of 100, 400, and 600 F (311, 477, and 588 K). The composites containing 31% fibers exhibited much better wear resistance than composites with 18% fiber content. The wear factors of the better composites tended to decrease with increasing load and increasing temperature. Although the specific wear factors are higher by factors of 10 to 400 in oscillating journal tests than in flat-on-flat oscillatory tests, the radial wear is within the stated acceptable wear for control surface bearings in high load applications.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1975
- Accession Number
- ADA020954
Entities
People
- Melvin T. Lavik
- Vern Hopkins
Organizations
- MRIGlobal