PEEK and PEI are high-performance engineering plastics with excellent mechanical properties, heat resistance, chemical stability and chemical corrosion resistance. They are often used in machining and aerospace fields. In this paper, four different contents of Carbon fiber were added to the MWCNT+PEI/PEEK layered structure PEEK phase. Carbon fiber has extremely high axial strength and modulus, can withstand high stress and deformation, and has excellent thermal stability, which is suitable for high temperature working environment. By testing the thermogravimetric analysis, quenched surface and tribological properties of CF/PEEK, the effect of Carbon fiber content on the layered structure and properties were systematically studied. Thermogravimetric tests showed that the thermal decomposition temperatures of all CF/PEEK composites were higher than 554℃, indicating that they showed excellent thermal stability. The increase of Carbon fiber content will increased the thermal decomposition temperature and reduced the evaporation loss of PEEK. The TEM test of the quenched surface showed that the fracture surface of the layered composite was relatively smooth. Driven by sufficient heat energy, Carbon fiber was effectively embedded in the PEEK phase and could effectively bear the external stress during the friction process. All layered composite are testing under experimental conditions of 61, 152, 228 N, 1 m/s, 120 min, 27 ℃ and 40%, the average friction coefficient and wear rate were reduced by at least 25% and 34%, respectively, indicating that they showed good tribological properties. The results of tribological experiments showed that the average friction coefficient and wear rate decrease first and then increase with the increase of Carbon fiber content under low load. With the increase of applied load, the friction coefficient and wear rate of the composites decreased gradually, and the influence of Carbon fiber concentration on friction and wear was weakened, and error range was reduced until the critical value is reached. The 15% CF layered composites were tested under the experimental conditions of 122 N, 0.5, 1.0, 1.5, 2 m/s, 120 min, 27 ℃ and 40%. With the increase of speed, the friction coefficient of MWCNT+PEI/15CF+PEEK layered composites decreased gradually, and the wear rate decreases first and then increases.

In summary, the effects of different contents of Carbon fiber on the structure and tribological properties of layered composites were studied by changing the content of Carbon fiber in PEEK phase. It’s found that 15% CF showed good tribological properties and excellent thermal stability, for designing high-performance tribo-parts with complex structures by FDM technique to replace conventional hybrid materials.