Ph.D. Tezi Görüntüleme

      In thi study hybrid friction materials were manufacured by using various organic and inorganic fibers. Some physical and mechanical properties of the samples were studied in addition to the friction and wear behaviour. The produced samples were produced from the ingrediens which were widely used by friction material manufacurers. Phenolic resin was used as a matrix and glass fiber,Stone wool, Kevlar pulp, sepiolite, basalt, Fiberfrax and steel fiber were used as reinforcing materials. The friction and wear behaviour of the materials were tested on a pin-on-disc type apparatus, which was controlled with a PC.

       The friction coeffient and specific wear of inorganic fiber- Kevlar reinforced samples decreased with increasing Kevlar pulp content. The friction coeffient decreased with increasing sliding velocity and contact pressere in all samples.

       The friction coeffient of sepiolite reinforced samples increased with increasing sepiolite rate up to 25 vol. % and decreased again above this ratio. The friction coeffient and specific wear rates of these samples were found comparatively less than the others.

       The addition of basalt to Fiberfrax containig samples decreased the friction coeffient to some extent for the same fiber volume ratio, but the friction coeffient and specific wear rate increased with increasing basalt above the 20 vol.% basalt content. Also, the presence of iron (Fe) and ferrous (Fe2O3) in wear debris showed that the disc surface was worn by these inorganic fibers