Abstract
The seizure behaviors of metals and plastics are studied under oil-lubricated sliding contacts. The experiments are carried out with balls on a ring wear tester. High carbon chromium steel (SUJ2) and Poly-etherether-ketone (PEEK) are used as the ball specimen with a diameter of 3/4 inches. The ring is made of forged steel (SF540A). The sliding velocity is varied from 4 to 19 m/s. The load is increased at a rate of 1 N/s up to the maximum load of 1177 N. The ring temperature is measured with an alumel-chromel thermocouple with a diameter of 0.5 mm, located 1 mm below the frictional surface. Results indicate that PEEK transits to seizure whenever the ring temperature exceeds about 160℃. In contrast, SUJ2 transits to seizure depending on the load, not on depending the temperature. The particle counter method can detect the seizure in the PEEK and SUJ2 materials. However, the number of wear particle generated in the seizure of PEEK materials is much less than in SUJ2. The wear mechanisms in the seizure are discussed, based on the observation results of scanning electron microscope (SEM).
