Accession Number:

ADA180487

Title:

Thermomechanical Contact Phenomena and Wear of Sliding Components

Descriptive Note:

Annual rept. 1 Jan-31 Dec 1986

Corporate Author:

THAYER SCHOOL OF ENGINEERING HANOVER NH

Report Date:

1987-03-27

Pagination or Media Count:

53.0

Abstract:

The objectives of this work have been to gain a better understanding of the wear of solid ceramic and ceramic-coated metallic seal rings in contact with carbon graphite and to determine the solidsolid contact conditions responsible for that wear. Ring-on-ring tests were run under dry conditions no sealed fluid with carbon graphite seal rings sliding against two types of hard seal face materials, monolithic silicon carbide and metallic materials coated with either tungsten carbide or titanium nitride. The total wear of the hard ring materials were very low in all cases, with reaction-sintered silicon carbide and titanium nitride-coated rings having the lowest total wear. There was less wear of the carbon graphite rings when they were run against coated rings than in contact with SiC. In the analytical phase of this work, the temperature and stress distributions in the sliding contact region were determined using finite element methods. It was shown that frictional heating is the dominant contributor to high localized stresses in the contact region, that plastic deformation can occur in the region, and that thermal deformations and stresses can be a major reason for coating failure. The influence of coating and substrate properties, as well as coating thickness, on the results and on potential failure mechanisms were studied.

Subject Categories:

  • Coatings, Colorants and Finishes

Distribution Statement:

APPROVED FOR PUBLIC RELEASE