M.Sc. Tezi Görüntüleme

Student:	İrfan SATIR
Supervisor:	Prof. Dr. Aydın BIYIKLIOĞLU
Department:	Mechanical Engineering
Institution:	Graduate School of Natural and Applied Sciences
University:	Karadeniz Technical University, Turkey

Title of the Thesis:	FRICTIONAL BEHAVIOURS OF NON-ASBESTOS AUTOMOTIVE BRAKE PADS UNDER WET AND DRY CONDITIONS
Level:	M.Sc.
Acceptance Date:	11/8/2006
Number of Pages:	66
Registration Number:	i1740

Summary:

In this study friction materials were manufactured using fibers which may be used as a substitute for asbestos. Frictional behaviours of the produced samples under wet and dry conditions were studied. The production of samples was done by using the ingredients which were widely used by pad material manufactures. Phenolic resin was used as matrix, basarit (basalt) glass fiber and stone wool were used as reinforcing materials and aluminum oxide and silicon oxide were used as friction modifiers. The friction behaviors of the materials were tested on a block-on-roller type Multi-Purpose Friction and Wear Tester.

Wet and dry frictional properties of the produced samples were tested at normal pressures between 0.5-1 MPa and sliding velocities of 0.63-1.89 m/s. Fiber ratios at samples were taken 27% for comparison.

Average coefficients of friction of composition containing basarit, fiberglass and stone wool without abrasive were measured as 0.46, 0.49, and 0.49 respectively at dry conditions. Average coefficients of friction of the samples containing aluminum oxide with basarit, fiberglass and stone wool were measured as 0.52, 0.56 and 0.58 respectively. Average coefficients of friction of compositions containing silicon oxide with basarit, fiberglass and stone wool were measured 0.51, 0.53 and 0.55 as respectively.

At wet conditions, average coefficients of friction of composition containing basarit, fiberglass and stone wool were measured 0.22, 0.19 and 0.20 as respectively. Average coefficients of friction of compositions containing aluminum oxide with basarit, fiberglass and stone wool were measured 0.25, 0.27 and 0.29 as respectively. Average coefficients of friction of compositions containing silicon oxide with basarit, fiberglass and stone wool were measured as 0.25, 0.24 and 0.24 respectively.

Obtained results indicated that aluminum oxide containing samples have higher friction coefficient than that of the silicon oxide containing samples. The result of studies revealed that fiberglass and stone wool rein forced samples nonabrasive compositions were affected more than that of the basarit containing samples at wet conditions.

Key words: Brake pad, Friction material, Non-asbestos friction material, Friction, Dry and wet friction