Basalt Fiber-Based Electrical Insulating Paper: Fabrication, Characterization, and Performance

Basalt fiber is a famous sound and thermal insulating material. In this study, a novel basalt fiber-based electrical insulating paper was successfully prepared, and its physical strength, dielectric properties, thermal stability, and glue permeability of the composite paper were systematically investigated. The results showed that the introduction of mica could make basalt fiber/mica composite paper (B-M paper). Meanwhile, the introduction of aramid fibrids into B-M paper could greatly increase the physical strength and dielectric performance (1–26 times). In addition, silicone adhesive bonding could further enhance physical strength and electrical properties, which were 1–45 times higher than those of pure composite paper. Thus, basalt fiber-based paper is a potential electrical insulating material.