Preparation, Mechanical Properties, and Wear Resistance of Non-Asbestos Organic Brake Pads with Waste Shell Powder
摘要
In the present work, the waste shell powder was utilized to fabricate non-asbestos organic (NAO) brake pads. The influences of varying amounts of waste shell powder and curing heat treatment temperatures on the microstructures, mechanical properties, and wear behaviors of these pads were investigated. It is found that the NAO brake pads with waste shell powder mainly compose of SiO2, CaCO3, and BaSO4. As the waste shell powder content increases from 5 to 17 wt.%, the hardness decreases from 88.33 HRM to 82.14 HRM and the flexural strength shows an initial rise followed by a decline, peaking at 57.24 MPa (9 wt.%). Increasing the curing temperature improves the mechanical and tribological performance of brake pads. The sample with 9 wt.% shell powder + 200 °C curing temperature exhibits optimal performance, with a low wear rate of 2.66 × 10−7 mm3 mm−1 N−1, a high hardness of 92.48 HRM, and a bending strength of 62.45 MPa. This research provides a novel technical pathway for implementing marine biomass resources in brake pad applications and a theoretical and experimental foundation for developing green, environmentally sustainable NAO brake pads.