Temperature-adaptive self-repairing antifriction coating as well as preparation method and application thereof

The invention discloses a temperature-adaptive self-repairing antifriction coating as well as a preparation method and application thereof, and belongs to the technical field of metal material surface modification. According to the invention, the temperature self-adaptive self-repairing antifriction coating is prepared on a substrate through an infiltration method by utilizing the self-repairing characteristic of paraffin and prepared polyurethane and the inherent antifriction property of paraffin and a carbon tube. When the coating is cut or scratched and the melting point of the coating is lower than the melting point of the paraffin, the damaged part can be repaired through the connection of a hydrogen bond and a disulfide bond on the polyurethane. When the temperature is higher than the melting point of the paraffin, the liquid paraffin flows into a damaged area, hydrogen bonds and disulfide bonds in the polyurethane also play a role, a smooth liquid coating is formed on the surface, and after a heat sour