Stick－Slip Characteristic of Brake Friction Material Bound by Lignocellulose Nanofiber Modified Phenolic Resin

Abstract

Phenolic resin modified with lignocellulose nanofiber (LCNF) was developed utilizing pulverized wood flour. Subsequently, application of the LCNF modifiedphenolic resin to brake friction materials was examined. It was shown that flexural strength of the friction materials was improved by using the LCNF modified phenolic resin as a binding material. Stick－slip phenomenon is known as cause of brake noise or vibration and is evaluated by amplitude of friction coefficient (Δμ). Measurement of Δμ showed that the LCNF modified phenolic resin decreased Δμ compared with that of unmodified phenolic resin. Also, it was found that Δμ depended on the LCNF content of resin, and 3 mass% LCNF showed the lowest Δμ.