Figure 2

Summary of crystal structure data and load-carrying mechanisms for some typical layered materials. (a) Polyhedral conformation24,25,26,27,28,29. (b) Ball and stick model. (c) Load-carrying mechanism. Test conditions: PB: 25 °C, 1770 rpm, 10 s; Maximum applied load: 75 °C, 1200 rpm, 3600 s.