Influence of Molybdenum Disulfide Particle Size on Friction and Wear Characteristics of Non-Asbestos-Based Copper-Free Brake Friction Composites

Abstract

Molybdenum disulfide is a successful solid lubricant because of its cleavage of the basal plane at the time of sliding, which helps to retain the lubrication nature in order to reduce wear and to maintain frictional stability. Thus the present study deals with the development of copper-free brake pads using molybdenum disulfide that possesses different grades based on the particle size, namely, technical (coarse), fine and superfine. The brake pads were developed using conventional manufacturing processes and characterized for its physical, chemical, thermal and mechanical properties as per industrial standards. Thermal stability was measured for the varying ingredients and the developed composites using thermogravimetric analyzer instrument. The tribological studies were done using Chase testing following IS2742 Part-4 standards. The results showed that coarse-sized (technical grade) molybdenum disulfide-based brake pads possess better thermal stability with good fade and recovery characteristics in turn leading to less wear when compared with the other two composites. This is because of its better heat dissipation and superior lubricating nature. Scanning electron microscopy and energy dispersive analysis were helpful in studying the wear behavior of the Chase-tested brake friction composite samples.

Investigation of Caryota urens fibers on physical, chemical, mechanical and tribological properties for brake pad applications

“…The shear strength for CUB3 is higher compared to other two composites which are mainly due to the better adhesion of friction materials layer with the backplate caused by effective curing of the composite. These can be inferred from the literature findings of Vijay et al 2019 and Ganesh Babu, 2019 [19,31].…”

“…The barytes, CUS Fibers are the varying ingredients and its formulation weight percentage are given in table 1. The conventional method was used to develop the brake pad, and its details are given in table 2 [16][17][18][19][20]. The developed brake pad is shown in figure 1.…”

“…No Ingredients of the Composites CUB1 CUB2 CUB3 1 Varying Ingredients CUS fibers 5 10 15 2 Barytes 35 30 25 3 Parental ingredients 60 60 60 Table 2. Sequential Procedure Followed in developing composites [16][17][18][19][20].…”

Influence of benzoyl chloride treatment on the tribological characteristics of Cyperus pangorei fibers based non-asbestos brake friction composites

“…The conventional methods were used to develop the brake pads, namely mixing in plough shear mixer having three chopper and one shovel rotating in the speed of 2800 rpm and 140 rpm respectively for 20 min, the sequence of mixing followed was fibers for 6 min, then fillers and frictional modifiers for 10 min and finally binders for 4 min. Followed by curing in hydraulic operated compression molding machine at 145°C for 8 min with five intermittent breathings having pressure of 13 MPa, followed by post-curing in hot air oven for 5.5 h by following step baking process from 140°C-160°C for 3 h At 160°C for 2 h; 160°C-165°C for 0.5 h. Finally the finishing was done to remove the unwanted resinous layer and make the pad to the required thickness using belt grinder [17,18]. The developed brake pads are given in figure 1(a).…”

Study on tribological properties of palm kernel fiber for brake pad applications

“…Though these fibers were used it has been found to have some problems such as unsteady performance eco friendliness and high in cost. Now the major area of research is on using natural fibers as the key ingredient [6][7][8]. The synthetic fibers were replaced by the natural fibers because of the bio degradability, Cost effectiveness etc Many natural fibers have been used as a key ingredients in the brake pad applications and various findings were obtained.…”