Performance assessment of hybrid composite friction materials based on flyash–rock fibre combination

J. of Materi Eng and Perform

Satapathy

et al. 2012

Self Cite

Friction composite formulation consisting of decreasing nanoclay/lapinus fibres content, increasing graphite/aramid fibres content, and master batch of phenolic/barite is designed, fabricated, and characterized for their mechanical, thermo-mechanical, and tribological studies in braking situations. A standard test protocol is adopted for evaluating braking performance. The nanoclay content (£2.25 wt.%) enhances hardness, impact strength, storage, and loss modulus characteristics of the friction composites. Such composites exhibit higher friction stability as well as variability coefficient. However, composites with higher content of nanoclay ($2.75 wt.%) exhibit moderate level of stability coefficient and minimum variability coefficient. Fade performance improves with nanoclay content whereas friction fluctuations increase continuously with increasing nanoclay content. The disc temperature continuously rises with nanoclay contents, it becomes maximum for nanoclay content 2.75 wt.%. The same composition found to be effective in arresting temperature rise, arrests fading, improves recovery, moderate stability with minimum variability coefficient, and higher level of l-performance hence recommended. The wear performance deteriorates with lapinus/nanoclay content and improves with the amount of aramid/graphite in the friction composites. Worn surface morphology study (using SEM) reveals the associated wear mechanisms responsible for wear of investigated composites. XRD study confirms the presence and dispersion of nanoclay with other composite ingredients.

Section: Tribological Performance Evaluation Methods and Procedures Formentioning

confidence: 99%

Effect of Nanoclay Reinforcement on the Friction Braking Performance of Hybrid Phenolic Friction Composites

J. of Materi Eng and Perform

Satapathy

et al. 2012

Self Cite

“…Satapathy and Bijwe 29 concluded that the 3 wt.% of aramid and 10 wt.% lapinus¯ber in friction formulation caused an enhancement in the wear and fade performance. Further Satapathy et al 30 reported that the combination of 5 wt.% Kevlar pulp and 25 wt.% hard lapinus¯ber enhances the -performance of the friction composites. Singh et al 31 reported that inclusion of nanoclay in friction formulation found to be e®ective in improving -performance and fading of friction composites.…”

Section: Introductionmentioning

confidence: 97%

Friction Braking Performance of Nanofilled Hybrid Fiber Reinforced Phenolic Composites: Influence of Nanoclay and Carbon Nanotubes

Satapathy

2013

NANO

Self Cite

Graphite lubricated phenolic-based friction composites¯lled with nanoclay and Multiwalled carbon nanotubes (MWCNT) and reinforced with lapinus and Kevlar¯bers have been successfully fabricated for evaluation of their physical, chemical, mechanical and tribological properties, respectively. The increase in nanoclay and MWCNT contents led to the increase in bulk physical properties such as void contents, ash contents, water absorption and compressibility. The impact, tensile and°exural strengths get a®ected deleteriously when complemented by lapinus and kevlar¯bers in the composites. However, with the increase in nanoclay and MWCNT contents the -performance, friction fade resistance and friction recovery enhanced whereas, friction°u ctuations, stability and variability coe±cients have been observed to be dependent on the composition. The addition of nanoclay and MWCNT raises the disc temperature whereas wear resistance of the friction composites increases with the decreasing in nanoclay and MWCNT contents. Comprehensively, it is found that with the higher nanoclay: MWCNT ratio (i.e., 1.375:1.375 wt.%) overall frictional response ( p ¼ 0:386) is enhanced, showed lowest fading (fade ¼ 22:80%) and excellent recovery performance (recovery ¼ 130:37%). Finally, the wear surface morphology studies have been done by using scanning electron microscope (SEM) to analyze the wear mechanisms qualitatively by understanding nature of the friction contact patches.

“…Among the many ingredients currently available for friction materials, the fibrous reinforcement: such as organic fibre (Satapathy and Bijwe, 2004), inorganic fibre Dadkar et al, 2010), ceramic fibre (Han et al, 2008), metallic fibre (Kumar and Bijwe, 2013) and their combinations Singh and Patnaik, 2015a) have been found to play a crucial role as they reinforce the composites during fabrication and also help in the formation of topographical features which enhance the tribo-performance. The role of Kevlar fibre has been well reported to aid wear minimization and friction stabilization (Gopal et al, 1996;Kim et al, 2001;Kumar et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

“…The role of Kevlar fibre has been well reported to aid wear minimization and friction stabilization (Gopal et al, 1996;Kim et al, 2001;Kumar et al, 2011). Lapinus fibres inherently comprising metallic-silicates, when combined synergistically with other fibres that improved the tribo-performance and suppress the unwanted phenomenon like noise, vibration, judder over wide range of driving conditions Dadkar et al, 2010;Singh et al, 2015b). Wollastonite fibres having high thermal resilience and inherent hardness have been found to stabilize the coefficient of friction (l) and maximize recovery performance (Santoso and Anderson, 1985;Kogel et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Assessment of braking performance of lapinus–wollastonite fibre reinforced friction composite materials

Journal of King Saud University - Engineering Sciences

Chauhan

et al. 2017

Self Cite

Brake friction materials comprising of varying proportions of lapinus and wollastonite fibres are designed, fabricated and characterized for their chemical, physical, mechanical and tribological properties. Tribological performance evaluation in terms of performance coefficient of friction, friction-fade, friction-recovery, disc temperature rise (DTR) and wear is carried out on a Krauss machine following regulations laid down by Economic Commission of Europe (ECE R-90). The increase in wollastonite fibre led to an increase in density and hardness whereas void content, heat swelling, water absorption and compressibility increased with the increased in lapinus fibre. The performance coefficient of friction, friction-fade behaviour and friction-stability have been observed to be highly dependent on the fibre combination ratio i.e. coefficient of friction, fade and friction-stability follow a consistent decrease with a decrease in the lapinus fibre content, whereas the frictional fluctuations in terms of l max À l min have been observed to increase with a decrease in lapinus fibre content. However, with an increase in wollastonite fibre content in formulation mix, a higher wear resistance and recovery response is registered. The worn surface morphology has revealed topographical variations and their underlying role in controlling the friction and wear performance of such brake friction composites. ª 2015 The Authors. Production and hosting by Elsevier B.V. on behalf of King Saud University. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).