Abstract
This article describes fretting behavior of zirconia and silicon nitride balls on an electro-deposited coating. Fretting tests are performed using a ball-on-flat configuration. The evolution of the kinetic friction coefficient is determined, along with slip ratio. Experimental results show that the steady-state friction coefficient between ceramic balls (Si3N4 and ZrO2) and an electro-deposited coating is about 0.06, lower than the value between AISI 52100 ball and the coating. After a steady-state sliding, the transition of the friction coefficient is varied with a ball. The friction coefficient for ZrO2 balls became a critical value after higher fretting cycles than those for Si3N4 and AISI 52100 balls. In addition, it is identified that two parameters can describe the transition of the friction coefficient. Finally, the evolution of the friction coefficient is expressed as an exponential or a power-law form.
Highlights
Frictional contact exists between a ball and a rail comprising an automotive seat slide track.For adjusting a seat, a ball is permitted to roll or slide between two rails
Good agreement was found between two friction coefficient evolutions with commercial and
Fretting tests with zirconia and silicon nitride balls were performed under the condition similar to that found in an automotive seat sliding rails
Summary
Frictional contact exists between a ball and a rail comprising an automotive seat slide track. In the author’s earlier work, the friction coefficient between a ceramic ball and an electro-deposited coating was determined in the range 0.25–0.3 under reciprocal sliding conditions [6]. The fretting behavior of ceramic balls was not studied under the conditions similar to those found in automotive seat slide tracks. The influence of a counterpart on fretting damage of an electro-deposited coating was not studied with the parameters described above. In this article, fretting tests were conducted to identify anti-fretting performance of an electro-deposited coating against silicon nitride (Si3N4) and zirconia (ZrO2) balls for use on automotive sliding rails. The coefficient of kinetic friction between an electro-deposited coating and a ceramic ball was determined. A method was proposed for predicting the friction coefficient evolution of an electro-deposited coating
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