The Effect of Molding Temperature on the Mechanical and Tribological Properties of Modified Phenolic Resin-Based Friction Materials

In order to investigate the influence of molding temperature on the mechanical and tribological properties of modified phenolic resin-based friction materials, six kinds of friction materials (FMs) with different molding temperatures were prepared by a hot-pressing process using melamine-modified phenolic resin (MPR) and boron-modified phenolic resin (BPR) as binders. The experimental results show that the density change of the friction materials is very small. The hardness, compressive strength, and compressive modulus decrease with the increase of molding temperature, and the impact strength decreases with the increase of molding temperature. The coefficient of friction (COF) of the melamine-modified phenolic resin-based friction material with a molding temperature of 160 °C is higher, and the stability is the largest. The COF of the boron-modified phenolic resin-based friction material decreases with the increase of the molding temperature, and the COF of each sample has a large difference. When the molding temperature is 160 °C, the COF of the samples is stable between 0.409 and 0.462 at different initial braking speeds. Relatively speaking, the sample with a hot-pressing temperature of 160 °C has better comprehensive properties, the wear mechanism is mainly abrasive wear and adhesive wear, and the large-area continuous friction film can stabilize the COF.