# Influence of Speed on the Tribochemical Reaction Products and the Associated Transitions for the Dry Sliding of Silicon Nitride against Steel

Ravikiran, A and Bai, Pramila BN (1995) Influence of Speed on the Tribochemical Reaction Products and the Associated Transitions for the Dry Sliding of Silicon Nitride against Steel. In: Journal of the American Ceramic Society, 78 (11). pp. 3025-3032.

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## Abstract

Dry sliding of $Si_3N_4$ against steel has been studied using a pin-on-disk machine as a function of speed at a pressure of 15.5 MPa. Four types of friction and wear behaviors can be observed with associated transition in their values, called regions R1, R2, R3, and R4, $R1 (0.1\hspace{2mm}to\hspace{2mm}1.25 ms^{-1})$ is associated with high friction as well as the wear rate of the pin and the negligible wear rate of the disk. In $R2 (1.25\hspace{2mm}to\hspace{2mm}3.5 ms^{-1})$ friction is low and the wear rate of the pin is negligible but the wear rate of the disk is high. The friction and the wear rate of the pin as well as that of the disk are high in $R3 (3.5\hspace{2mm}to\hspace{2mm}6.5 ms^{-1})$. In $R4 (6.5\hspace{2mm}to\hspace{2mm}12.0 ms^{-1})$ the friction is low. The wear rate of the pin is similar to that in R3, while that of the disk is very low. SEM, EDXA, XRD, and IR reveal that each of these changes is associated with certain tribochemical interaction. R1 is associated with reaction between $Si_3N_4$ and water vapor to form hydrated silica $(SiO_2{\cdot}^nH_2O)$, R2 is controlled by softening of $SiO_2{\cdot}^nH_2O$, R3 is characterized by microfracture and limited formation of $Y_2SiO_5$, and R4 is associated with increased formation of $Y_2SiO_5$ and $SiO_2$.

Item Type: Journal Article http://dx.doi.org/10.1111/j.1151-2916.19... Copyright of this article belongs to Blackwell. Division of Mechanical Sciences > Mechanical Engineering 20 Nov 2006 27 Aug 2008 12:22 http://eprints.iisc.ernet.in/id/eprint/8617