Investigating of the Effect of Kevlar, Serpiolite, and Carbon Fibers on the Tribological and Physical Properties of Eco-friendly Brake Pads

Brake pads are one of the consumable parts in the automotive industry. Due to the excessive use of this part in cars, it has biodegradation effects on the environment, therefore, in this research, an attempt was made to use environmentally friendly materials such as fly ash, which is a by product of steel furnaces, instead of harmful materials such as asbestos and copper powder. Is. In this research, brake pads were made in a basic chemical formula by changing the percentage of Serpiolite, Kevlar and carbon fibers, and using a dynamometer device in the three initial stages, warm state and finishing stage, the tribological properties including hardness, coefficient of friction (COF), the rate of wear and the amount of recovery and fading were measured. Also, in order to measure the apparent porosity, water and oil absorption test was performed. Also, the microstructural examination of the pads was done with a scanning electron microscope. The results show that with the increase of carbon fiber, the COF increases at the beginning, and with the increase of carbon fiber, the COF decreases in the initial and thermal stages, as well as the increase in wear and tear. In this research, by adding Kevlar fibers, the wear resistance increased, but the coefficient of friction in the hot step decreased. The sample containing serpiolite fibers has a more balanced wear coefficient and COF than other samples due to the shorter length of the fibers and also the less use of fibers. In this research, the effect of type and shape of fibers on their distribution and dispersion in brake pads in mechanisms is presented.

کلیدواژه ها:

Brake pads ، friction coefficient ، phenolic resin ، carbon fibers ، Kevlar fibers