Thermal Characteristics Of Novel Brake Friction
Materials For Light Rail Transit Applications
Author(s)
N. Valliyappan, D. Berhan, M. N. Darius & G. Solomon
Abstract
A batch of five formulations (SP1, SP2, SP3, SP4 and SP5) of novel brake
friction materials are being developed and tested for light rail transit (LRT)
applications. This paper presents the thermogravimetric (TG) and derivative
thermogravimetric (DTG) analysis coupled with the mass spectroscopy (MS) of
those friction material samples. The LRT braking system operates at elevated
temperatures and may reach an upper extreme of 900°C. In this research,
temperature range from ambient to 600°C is considered the temperature zone
that signifies the limits of normal braking operation and considerable weight
loss. In general, all samples except SP4, decompose in four steps and registered
significant weight loss averaging 5.53% (± 0.20%) of the original weight.
Sample SP4 experienced the highest weight loss of 5.77% in three steps.
Samples SP1 and SP5 were found to be stable, temperature wise, in
decomposing compared to all other samples. Sample SP1 exhibited a controlled
rate of decomposition apparently over a wider temperature range (230°C –
688°C) with a total loss of weight of 5.37%. In contrast, sample SP5
decomposed in a greater magnitude over a narrower temperature gap (303°C –
483°C) albeit the total weight reduction is 5.30%. MS signals indicating mass
number of 2 and 44 was detected in all samples at critical temperature zones
corresponding to substantial weight loss. This denotes the probable evolution of
compounds consisting of hydrogen, helium, carbon dioxide, nitrogen oxide and
propane and is related to the physical-chemical reaction which is explained in
this paper.
Keywords: thermogravimetric analysis, mass spectroscopy, friction material,
light rail transit.
Keywords
thermogravimetric analysis, mass spectroscopy, friction material,
light rail transit.
Related Book
Other papers in this volume
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