The invention discloses modified
graphite, a high-
flame-retardant MC
nylon material, a lightweight wearing plate and an
air spring. The modified
graphite material is modified by sequentially oxidizing and reducing a powdery
graphite material to form reduced
graphite oxide and then introducing an amino
flame-retardant group and a
phosphate flame-retardant group onto the reduced
graphite oxide. The high-flame-retardant MC
nylon material comprises
caprolactam, a catalyst, an activating agent and a modified graphite material. The light-weight wearing plate comprises a wear-resisting plate which is integrally formed by adopting a high-flame-retardant MC
nylon material, and the wear-resisting plate is provided with a T-shaped
metal insert, an exhaust groove and a circular ring backstop. The
air spring comprises a high-strength high-flame-retardant lightweight wearing plate mounted above an auxiliary spring, a high-strength lightweight
composite material upper cover plate mounted at one end of an air bag, and a PAI-Si high-wear-resistant lubricating
coating sprayed on a
metal plate and / or the wearing plate. The
dry friction coefficient of the composite upper cover plate and the high-strength and high-flame-retardant lightweight wearing plate in an oil-free and maintenance-
free state meets the requirement of being smaller than 0.1.