Physical and chemical changes of organic disc pads in service

Jacko, M. G.

doi:10.1016/0043-1648(78)90118-7

Cited by 52 publications

(20 citation statements)

References 4 publications

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“…On the other hand, the increase of the transfer layer thickness at elevated temperatures indicates active chemical adhesion of wear debris on the gray iron counter surface. The removal of the transfer layer at the temperature above 300°C in figure 4, on the other hand, is attributed to the loss of adhesion in transfer layer due to thermal decomposition of organic binders and solid lubricants [8,20,21]. Thermogravimetric analysis (TGA) of the friction material was carried out to find a correlation of the transfer layer thickness with thermal decomposition of the ingredients in the friction material ( figure 5).…”

Section: Effect Of Sliding Temperature On Transfer Layer Formationmentioning

confidence: 99%

The Role of Transfer Layers on Friction Characteristics in the Sliding Interface between Friction Materials against Gray Iron Brake Disks

et al. 2005

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The effect of transfer layer formation on friction performance was studied using a brake friction material containing 15 ingredients. Based on a base formulation, 13 friction material specimens containing different relative amounts of ingredients were produced and they were tested on gray iron disks using a small-scale friction tester. A non-destructive four-point probe technique to measure electrical resistance of the thin film was used to estimate the transfer layer thickness. Results showed that the transfer layer formation was highly dependent on the relative amount of ingredients in the friction material and temperature. Among various ingredients, solid lubricants and iron powders increased the transfer layer thickness but no apparent correlation between transfer layer thickness and the coefficient of friction was found. Strong influence from individual ingredients was observed, dominating the friction characteristics during sliding. On the other hand, the thick transfer layers on the disk surface tended to reduce the friction material wear and the amplitude of the friction coefficient oscillation during sliding.

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Section: Effect Of Sliding Temperature On Transfer Layer Formationmentioning

confidence: 99%

The Role of Transfer Layers on Friction Characteristics in the Sliding Interface between Friction Materials against Gray Iron Brake Disks

et al. 2005

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“…These ingredients are selected to play specific roles in friction performance during braking, with synergistic effects often achieved from combinations of two to three ingredients. A great deal of effort has been made to find new ingredients to solve various brake-related problems such as excessive wear and vibration [6][7][8][9]. However, detailed information about the role of ingredients on friction performance is very limited due to the complexity of the material system and for proprietary reasons [10].…”

Section: Introductionmentioning

confidence: 99%

Tribological properties of brake friction materials with steel fibers

et al. 2009

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The tribological properties of brake friction materials with and without steel fibers were investigated. The focus of this study was determining the effect of steel fibers on the speed sensitivity of the friction coefficient. The speed sensitivity of the friction coefficient is closely associated with the stick-slip phenomenon. The results indicate that the friction material containing steel filbers was more sensitive to sliding speed, exhibiting a highly negative µ-v relation. In particular, the friction material with steel fibers showed a larger vibration amplitude during brake applications, suggesting that the µ-v relation was strongly related to the friction-induced vibration. On the other hand, the wear resistance of the friction materials containing steel was significantly better than that without steel fibers, suggesting longer service life. A possible mechanism of the stick-slip by the steel fibers is discussed in terms of the physical properties of the steel fiber and the gray iron rotor.

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“…To achieve the low wear property, a brake lining need to be tough, heat-resistant, and have predictable thermal degradation behavior [12]. However, an organic brake lining material subjected to a high temperature environment usually experiences a phenomenon called "fade" [7,[12][13][14][15], in which the normal lowtemperature coefficient of friction decreases temporarily. An automotive brake lining material requires being light and able to resist high temperature and absorb enough friction energy [15] for safety reasons.…”

Section: Introductionmentioning

confidence: 99%