ABSTRACT The silicon carbide (SiC) ceramics containing multilayer graphene derived from graphite exfoliation were successfully prepared by pressureless sintering, and the effect of graphene content on the sintering behaviours, microstructure, mechanical, tribological, electrical and thermal properties was investigated in detail. The bulk density, bending strength and hardness of the composite ceramics gradually decrease with the increase of graphene content, but the friction, conductance and thermal conductance properties are improved obviously. When the graphene content reaches 5 wt-%, the dry friction coefficient of 0.22, electrical conductivity of 2724.14 S−1 m−1 and thermal conductivity of 8.5 W (m−1 K−1) can be obtained, indicating good comprehensive mechanical, tribological, electrical and thermal properties. This multilayer graphene reinforced silicon carbide ceramic is a promising seal material instead of SiC seal materials containing graphite to be applied in next-generation mechanical seals.

中文翻译：

---

机械密封用多层石墨烯增强碳化硅陶瓷的无压烧结

摘要 通过无压烧结成功地制备了含有石墨剥离衍生的多层石墨烯的碳化硅（SiC）陶瓷，并详细研究了石墨烯含量对烧结行为、微观结构、机械、摩擦学、电学和热学性能的影响。随着石墨烯含量的增加，复合陶瓷的体积密度、弯曲强度和硬度逐渐降低，但摩擦、电导和导热性能明显提高。当石墨烯含量达到5 wt-%时，可以获得0.22的干摩擦系数，2724.14 S-1 m-1的电导率和8.5 W（m-1 K-1）的热导率，表明具有良好的综合力学性能，摩擦学、电学和热学特性。