Characterization of holding brake friction pad surface after pin-on-plate wear test

Metal sulfides play a major role in determining the friction and wear performance of the brake friction composites. The usage of the combinations of metal sulfides improves tribological performance compared to its individual metal sulfides in the formulation of friction material. In this work, the effect of the Bismuth III sulfide and Iron disulfide combination was evaluated against the tribological performance in the formulation of the friction materials. Six brake friction pads were developed by properly balancing the weight percentage of Bismuth III sulfide and Iron disulfide in the formulation. The tribological performance of the friction liners was studied using a chase tribo-meter following the IS2742 test protocol. The worn surfaces of the brake pad samples were examined for its surface morphology and elemental behaviour using a Scanning electron microscope and an Energy-dispersive X-ray spectroscope. It was observed that the partial replacement of the Bismuth III sulfide with Iron sulfide improves the friction and fade performance. The abrasive nature of the Iron sulfide in the friction pad increases the coefficient of friction and causes the high wear loss beyond the ratio of 4:6 of the mixed sulfides. A statistical approach named preference selection Index was employed to rank the brake friction materials based on the multiple performance criteria.

Section: Wear and Worn Surface Analysismentioning

confidence: 95%

Synergistic effect of bismuth III sulfide and iron sulfide in the tribological performance of brake friction composite

Balachandran¹,

K²,

AHMED³

et al. 2022

“…The formation of primary plateaus in the worn pad's surface is essential to carry the load and improve friction. In contrast, secondary plateaus formed by the compaction of soft materials such as worn out resins, etc, have inadequate load-bearing capacity, so higher primary plateaus are preferred for ideal friction material, and lower secondary plateaus are preferred [42][43][44]. However, there was less lubrication in the BM06 there was significant wear loss due to increased frictional heat.…”

Section: Worn Surface Characterizationsmentioning

confidence: 99%

Synergistic performance of expanded graphite—mica amalgamation based non-asbestos copper-free brake friction composites

Sathyamoorthy

Vijay

Singaravelu

2022

Recent advancements in brake pad applications emphasise various friction compositions that exclude toxic components such as asbestos, copper etc., in order to provide superior performance without hurting the environment, human life and aquarium species. In this work, brake friction materials were fabricated by the conventional manufacturing process as standard brake pads using expanded graphite with the synergetic effect of thermal resistant material mica flakes. Six standard brake pads were produced based on varying the expanded graphite by 16, 14, 12, 8, 6 & 4 weight percentage, which is compensated using the Mica flakes by 4, 6, 8, 12, 14 & 16 weight percentage, fixing the composition of other ingredients and designated as BM01, BM02, BM03, BM04, BM05 and BM06. Physical, chemical and mechanical, characterisations of the formed friction materials were carried out in accordance with IS 2742 and ISO 6312. A full-scale inertia brake dynamometer was used to determine the fade, recovery characterisations with the pressure and speed sensitivity as of JASO-C-406. From the experimental observations, BM03 friction composites reveal excellent low fade and high recovery characteristics because of the integrated effect of expanded graphite (superior lubricity) & mica (good thermal stability). Worn surface analysis was studied with the help of a scanning electron microscope. The inclusion of expanded graphite-mica as a hybrid “lubricant-filler” combination in composite materials for friction braking application results in performance synergism.

“…Considering the excellent comprehensive properties, the PRMMCs show a good application prospect in braking friction. However, most of the research focuses on the wear performance and crack detection and repair of brake disc of automobiles [23][24][25][26] and highspeed trains [27][28][29][30], and there are few researches on brake discs of oil drilling rigs. Therefore, in the paper, Mn copper-nickel alloy/W 2 C composite coating was prepared on the surface of 45 steel by non-pressure impregnation process.…”

Section: Introductionmentioning

confidence: 99%

Tribological characteristics of W₂C reinforced Mn copper-nickel alloy matrix composite coating for rig disc brake

Guo

Zhang

et al. 2019

As one of the key components of drilling rig, the tribological properties of the rig disc brake directly affect the efficiency and safety of oil/gas drilling process. In this study, a newly developed W 2 C reinforced Mn copper-nickel alloy matrix for disc brake material were prepared on 45 steel substrate by non-pressure impregnation method. Micro-structure and tribological properties of the composite coatings at different specific pressures and rotation speeds were investigated. The results showed that a good bond was formed at the interface of W 2 C and Mn copper-nickel alloy, and the bonding between the coating and the 45 steel matrix was also reliable. The COF changed periodically, but became stable at high load or high speed. Moreover, the wear resistance was significantly improved compared with the commonly used 16 Mn material. Eventually, the wear mechanism was well discussed and summarized that the wear process was a dynamic process of W 2 C particle fatigue falling and the change of the surface film, which was the result of the joint action of various wear mechanisms.