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Wednesday, May 16, 2007 - 4:40 PM

Thermal Spraying of FeB Coatings Containing h-BN Solid Lubricant

I. Ozdemir, Dokuz Eylul University, Izmir, Turkey; B. Wielage, T. Grund, TU Chemnitz, Chemnitz, Germany; Y. Tsunekawa, Toyota Technological Institute, Nagoya, Japan

Crushed and rounded ferroboron (FeB) powders of Fe-18.8B-0.2C-0.5Si-0.8Al (wt.-%) were deposited onto an aluminum substrate by atmospheric DC plasma spraying and HVOF methods to improve its tribological properties. Hexagonal boron nitride (h-BN) powders which have excellent lubricating properties similar to graphite were incorporated to the iron boride powders as solid lubricant by sintering process and high energy ball milling technique which allows homogeneous distribution of solid lubricants in a hard metallic matrix to obtain protective coatings with low friction coefficient. As-sprayed coatings are composed of mainly FeB, iron matrix supersaturated with boron owing to the rapid solidification of molten droplets flattened on a substrate. The friction and wear behaviors of each coating were evaluated using ring-on-disk type wear tester under paraffin base oil condition in air atmosphere. Prelimenary results revealed that iron boride powder with h-BN powder (5 wt.%) is an applicable method to produce a protective composite coating against friction and wear.


Summary: Hexagonal boron nitride (h-BN) powders which have excellent lubricating properties similar to graphite were incorporated to the iron boride powders as solid lubricant by sintering process and high energy ball milling technique which allows homogeneous distribution of solid lubricants in a hard metallic matrix to obtain protective coatings with low friction coefficient. The friction and wear behaviors of each coating were evaluated using ring-on-disk type wear tester under paraffin base oil condition in air atmosphere.