Wear Mechanisms for Metallic Surfaces in Sliding Contact.
Abstract
(1) Spherical metal particles in the size range of 1/2 to 60 micrometers found when grinding chips are examined in the scanning electron microscope and a mechanism for their formation based on surface energy is presented. (2) Micron-sized spherical particles in sliding contact are found to reduce the static coefficient of friction, as with the case of larger-sized balls and rollers in bearings. (3) A mechanism for the accelerated wear of bearing surfaces due to the cutting action of the spherical particles between bearing surfaces in sliding contact is proposed and verified experimentally. (4) A potential method for reducing galling wear of materials at high speed sliding contact is presented using a newly developed alloy design that involves the atomization of the liquid alloy in an inert atmosphere and the consolidation of the resulting powder by sintering hydrostatically compressed billets. This results in a more uniform distribution of small sized carbides throughout the matrix as compared to nonuniform distribution of large sized carbides in the wrought material. Segregation of carbides can result in large areas of softer matrix which are potential regions for adhesion and consequent galling. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1976
- Accession Number
- ADA039958
Entities
People
- M. C. Shaw
- R. Komanduri
Organizations
- Carnegie Mellon University