Effect of Wet Granulation on Tribological Behaviors of Cu-Based Friction Materials

Abstract

Because of the excellent thermal conduction, corrosion resistance, and tribological properties, copper-based friction materials (CBFMs) were widely used in airplanes, high-speed trains, and wind power generation. With operating speed continuously increasing, CBFMs are suffering more complicated and extreme working conditions, which would cause abnormal abrasion. This paper presents an experiment to investigate how the tribological behaviors of CBFMs are regulated by granulation technology. Samples were prepared by the method of granulation and cool-pressed sinter. The tribological properties of specimens with different granule sizes were studied. The results showed that granulation could improve the tribological properties of CBFMs. The friction coefficient (COF) increased first and then decreased with increasing granule size. Specimen fabricated with 5–8 mm granules obtained the lowest COF, which was reduced by 22.49% than that made of powders. Moreover, the wear rate decreased first and then increased as granule size increased. The wear rate of samples prepared by granules 3–5 mm was lower than that of all of the other samples. This is because the structured samples prepared by wet granulation can promote the formation of secondary plateaus, which are beneficial for enhancing tribological properties. This makes granulation a promising method for enhancing the tribological performances of CBFMs.

Evaluation of the Mechanical and Tribological Behavior of Polyether Ether Ketone Fiber-Reinforced Resin-Based Friction Materials Fabricated by Wet Granulation

“…As observed in Figure 11 a, a large amount of wear debris and pits were found, indicating that the wear mechanisms were severe abrasive wear and adhesive wear [ 5 ]. In fact, the composition of RBFMs can determine wear resistance and then influence its wear mechanisms [ 38 ].…”

“…As an important part in brake systems, resin-based friction materials (RBFMs) are the last line of defense for safe operation; their stability and reliability are directly related to the safety of passengers [ 2 , 3 ]. At present, friction materials applied to brake systems can be divided into four categories: ceramic-based friction materials, resin-based friction materials, powder metallurgy friction materials, and C/C composite materials [ 4 , 5 , 6 ]. Among them, RBFMs are widely used because of their simple preparation and low cost [ 4 ].…”

Tribo-performance analysis of white ark shell powder/grewia optiva fiber reinforced brake friction composites

“…Initially, phenol formaldehyde, barium sulfate, alumina powder, tire rubber, graphite and white ark shell powder were mixed in a mixer for 5 min. Thereafter, fibers were added and mixed homogeneously for another 20 min in a rotary ball milling machine with 10:1 ball to powder ratio to avoid the husk formation of fibers [36]. The prepared mix was added into a mold cavity and hot pressed at a temperature of 160 °C-170 °C and pressure of 12 MPa for 10 min.…”

Evaluation of tribological properties of silane‐treated rapeseed straw fiber reinforced friction polymer composites prepared by wet granulation

“…On the other hand, it reduces dust pollution, purifies the production environment and facilitates shipment 11 . Li et al 12 used granulation and cold press sintering to prepare copper‐based friction materials with better wear resistance than ungranulated ones. The results of Liu et al showed that the sulfur granulation process is not only environmentally friendly, but also results in a uniform particle size distribution of the raw material 13 …”