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The effect of the addition of blast furnace slag on the wear behavior of heavy transport polymer-based brake pads
(Elsevier Sci Ltd, 2023) Sagiroglu, Selami; Akdogan, Kamil
This study developed a new asbestos-free brake lining by including blast furnace slag. In addition to phenolic resin as the main binder, brass shavings, copper powder, alumina, and iron oxide powders as reinforcement material, graphite powder to increase friction stability, and calcium carbonate as filler were used. First, by applying a hot press and heat treatment, five samples were created in which these materials were used in various proportions. All samples were tested for tribological behavior and wear parameters, and wear surfaces were evaluated. According to the experimental results, the model containing 50% slag had the lowest wear rate (4.05 gcm3/Nm-6) and the highest friction coefficient (0.4552); yet it also had the most frictional irregularity. The sample containing 7.5% slag, 15% bronze chips, 15% copper powder, 20% phenolic resin, 15% graphite powder, 5% Alumina, 2.5% iron oxide and 20% calcium carbonate gave the best results. The average coefficient of friction for this sample was 0.4511 and the specific wear rate was 6.77 cm3/Nm-6. It has been proven that up to 7.5% slag in brake pads can be beneficial; however, it is not beneficial to use more than this ratio.