Abstract
In this study, the effect of silane treatment of Fe 3O 4 on the magnetic and wear properties of Fe 3O 4/epoxy nanocomposites was investigated. Fe 3O 4 nanopowders were prepared by coprecipitation of iron(II) chloride tetrahydrate with iron(III) chloride hexahydrate, and the surfaces of Fe 3O 4 were modified with 3-aminopropyltriethoxysilane. The magnetic properties of the powders were measured on unmodified and surface-modified Fe 3O 4/epoxy nanocomposites using SQUID magnetometer. Wear tests were performed on unmodified and surface-modified Fe 3O 4/epoxy nanocomposites under the same conditions (sliding speed: 0.18 m/s, load: 20 N). The results showed that the saturation magnetization ( M s) of surface-modified Fe 3O 4/epoxy nanocomposites was approximately 110% greater than that of unmodified Fe 3O 4/epoxy nanocomposites. This showed that the specific wear rate of surface-modified Fe 3O 4/epoxy nanocomposites was lower than that of unmodified Fe 3O 4/epoxy nanocomposites. The decrease in wear rate and the increase in magnetic properties of surface-modified Fe 3O 4/epoxy nanocomposites occurred due to the improved dispersion of Fe 3O 4 into the epoxy matrix.
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