Dry sliding of a low steel friction material against cast iron at different loads: Characterization of the friction layer and wear debris

A Test Stand Study on the Volatile Emissions of a Passenger Car Brake Assembly

“…This was demonstrated at the pin-on-disc level where Nosko et al [7] found a transition temperature of 168-189 • C measured in the disc material. Similarly, Alemani et al [4,8,9] observed that the transition temperature was unaffected by other testing conditions in the range 165-190 • C. Instead, Wahlström et al [10] found that the ultrafine number increased by several magnitudes when the pin temperature approached 300 • C. The issue of the transient temperature at the brake dynamometer level was also addressed by Mathissen et al [11] who noticed that emissions were at about 10 9 N/stop up to a disc temperature of 160 • C, while the number rose by five orders of magnitude for higher temperatures. Garg et al [12] stated that the particle number increased by 1-2 orders of magnitude when the temperature rose from 200 to 400 • C because of supposed condensation phenomena that could be influenced by airflow used in the experiment.…”

“…As highlighted in the Introduction, several authors [7][8][9][10][11][12][13] identified a critical temperature when brake friction materials were tested. In both pin-on-disc and dynamometric test setups, the critical temperature inducing a shift towards the emission of ultrafine particulate fraction is between 165 • C and 400 • C depending on the test conditions and tested materials.…”

Pin-on-disc investigation on copper-free friction materials dry sliding against cast iron

“…After the early stage, a friction layer forms on the disc surface and on the pad surface. These layers are rich in iron oxides, which reduce the abrasive behavior [42].…”

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

“…To do this, the methodology relies on height segmentation on the Z-axis and equivalent diameter thresholding on the X-Y plane and on a series of parameters related to plateaus: upper plateau limit (UPL), lower plateau limit (LPL), lower valley limit (LVL). ISO 25178-2 [2] shows a scale-limited surface with its corresponding areal MPC and the regions used in the definitions of parameters UPL, LPL, UVL, and LVL. Rpq, Rvq and Rmq.…”