Fluororubber/Basalt Fiber Composites With Tailored Interfaces for High‐Frequency Vibration Attenuation

High‐frequency vibrations present a critical challenge to the reliability of precision systems, yet conventional elastomeric damping materials often fail in this regime due to their slow molecular relaxation kinetics. Here, a series of basalt fiber (BF) reinforced fluororubber (FKM) composites with improved high‐frequency vibration attenuation was developed through fiber surface modification and control of fiber–matrix interactions. The BF surface morphology and chemistry were modified by NaOH etching followed by vinyltriethoxysilane treatment, potentially altering fiber–matrix interactions. The effects of BF content and modification parameters on the microstructure, mechanical properties, and damping behavior were systematically investigated. The optimal formulation (1.0 wt%–100°C–2.5 mol) increased composite stiffness and hardness and markedly attenuated high‐frequency vibration responses. Specifically, the root mean square of the frequency response function decreased from 35.0 dB for pure FKM to 26.4 dB, and the high‐frequency resonance peak at 3.3 kHz was suppressed by 15 dB. This work provides a novel design strategy for developing high‐performance elastomeric composites with tailored high‐frequency vibration attenuation through interface modification.