Abstract
The friction and wear behavior of Sintered Silicon Nitride (SSN) and Hot Pressed Silicon Nitride (HPSN) when sliding with a diamond tip under various conditions were investigated. The cathodoluminescence mode in a scanning electron microscope and Scanning Acoustic Microscopy were very helpful to study surface damage. Wear is an association of plastic deformation, the formation of a hydrated oxide layer and fractures. The occurence of fractures and plastic deformation leading to the formation of “craters” were observed for SSN in low humidity. This phenomenon is associated with the presence of subsurface flaws in this ceramic. They represent weak points from which fractures orginate. The effect of humidity is benficial for SSN, as fractures are eliminated and corrosive wear takes place. The wear rate is decreased by humidity. On the other hand, the effect of humidity on HPSN, where no fractures appeared, was detrimental, as corrosive wear took place. However, the effect on the friction coefficient is detrimental for both ceramics: the friction coefficient is 0.1 in 60% R.H. and 0.04 in 10% R.H.
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