Advanced Universal High Temperature Tribometer
Abstract
Small, mesoscopic-sized, steam-powered machines are being developed using new materials while operating at high speeds and temperatures in an effort to achieve high efficiencies and power densities. It is imperative that an in-depth understanding of material tribological properties be gained to ensure that the goal of long life and high efficiency are achieved in the developed machinery. Due to the wide range of parameters affecting wear, an advanced tribometer that accurately models the application environment and operating conditions is needed. The main objective of the high temperature steam tribometer project was to design, build, and test a new and advanced tribometer capable of determining friction wear and wear characteristics of various mesoscopic steam engine materials. The specimens installed in the developed tribometer can be tested at surface velocities greater than 50 m/s, under loads up to 400 N, while subjected to superheated steam at temperatures up to 600 degrees C. Metallic or ceramic test specimen discs from 1 to 4 inches in diameter and ball/pin specimens of 0.25 inches in diameter may be used. The computer controls the tests and records friction force, environmental conditions, and disc speed. Key aspects of the building and testing of the tribometer are described, such as the installation and alignment of the samples, dynamics of the loading device, and the measurement system (normal load, friction, and wear rate). Tribological results of some initial tests on ceramics, metals and composites with steam lubrication also are presented. (20 figures)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 2004
- Accession Number
- ADA423902
Entities
People
- Hooshang Heshmat