**Author details**

Yongsheng Zhang\* , Yunfeng Su, Yuan Fang, Yae Qi and Litian Hu

\*Address all correspondence to: zhysh@licp.cas.cn

State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, China

## **References**

Graphite has a good lubricating property at room temperature to 300 °C, and CaF2 at 250 °C to 1000 °C. In addition, BaSO4 also possesses excellent self-lubricating performance over a broad temperature range. During the sliding process, these SLs form the self-lubricating film that is helpful to reduce direct contact between the ceramics and further improved the

**Figure 11.** Variation of the difference value of coefficients of thermal expansion between the adjacent layers with the

**Figure 12.** The friction coefficients of two kinds of laminated-graded self-lubricating composites at room temperature

tribological properties of the materials [17,18].

70 Advances in Functionally Graded Materials and Structures

gradient exponent *p* [18].

to 800 °C.


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