Keyword: «boron nitride»

The paper presents the results of a study of polymer composite materials based on polytetrafluoroethylene (PTFE) with nanosized boron nitride with mechanical activation and ultrasonic treatment. The introduction of boron nitride with ultrasonic activation in PTFE leads to the preservation of deformation-strength properties with an increase in compressive strength by 58% and hardness by 24% compared to the initial polymer. The lowest value of the mass wear rate was obtained for the composition with ultrasonic activation while maintaining a low friction coefficient. The CLTE of composites decreases by ~2.5 times relative to the polymer matrix. It is shown that composites with ultrasonic treatment are characterized by higher mechanical and tribological properties compared to composites containing boron nitride with mechanical activation.