Accession Number : ADA317248
Title : Ceramic Bearing Technology Program, Volume 1: Final Report.
Descriptive Note : Final rept. 1 Aug 92-1 Jul 95,
Corporate Author : OKLAHOMA STATE UNIV STILLWATER
Personal Author(s) : Komanduri, R. ; Lange, J. ; Wicksted, J. ; Krasinski, J.
PDF Url : ADA317248
Report Date : JUL 1995
Pagination or Media Count : 182
Abstract : This project deals with the development of advanced manufacturing technologies for finishing silicon nitride balls and rollers for bearing applications and non-destructive inspection (NDI) methods for assessing surface damage of ceramic materials and to correlate the surface properties with tribological performance. Magnetic field assisted polishing was used for finishing the balls and magnetic abrasive finishing for finishing rollers. By applying low levels of controlled force (1 N/ball or less) the damage to the finished surface is expected to be minimal. Also chemomechanical polishing was used to minimize the brittle fracture. Using these techniques the polishing time was reduced from some 10 - 20 weeks to about 20 hours. The finish obtained was about 5-10 nm and the sphericity in the range of 0.5 - 1 micrometers. The non-destructive inspection (NDI) techniques used include Raman spectroscopy and radio frequency absorption (Lange), Brillouin scattering, and photoacoustic methods to detect surface damage. Inelastic Raman Light Scattering technique was found to be a rapid, non-contact method for characterizing the physical properties of the near-surface (approx. 2 micrometers) ceramic material in bearing balls. A number of features of the Raman spectra were demonstrated to be related to properties of the ceramic which are pertinent to the performance of the bearing balls.
Descriptors : *ROLLER BEARINGS, *SILICON NITRIDES, *BALL BEARINGS, LIGHT SCATTERING, MAGNETIC FIELDS, SURFACE ANALYSIS, OPTIMIZATION, NONDESTRUCTIVE TESTING, RAMAN SPECTROSCOPY, FRACTURE(MECHANICS), CERAMIC MATERIALS, BRITTLENESS, RAYLEIGH SCATTERING, QUALITY CONTROL, THERMAL IMAGES, ANTIFRICTION BEARINGS, WEAR RESISTANCE, POLISHING, CHROMIUM COMPOUNDS, ABRASIVE BLASTING.
Subject Categories : Ceramics, Refractories and Glass
Machinery and Tools
Distribution Statement : APPROVED FOR PUBLIC RELEASE